| /* gspawn.c - Process launching |
| * |
| * Copyright 2000 Red Hat, Inc. |
| * g_execvpe implementation based on GNU libc execvp: |
| * Copyright 1991, 92, 95, 96, 97, 98, 99 Free Software Foundation, Inc. |
| * |
| * GLib is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public License as |
| * published by the Free Software Foundation; either version 2 of the |
| * License, or (at your option) any later version. |
| * |
| * GLib is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with GLib; see the file COPYING.LIB. If not, write |
| * to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| |
| #include "config.h" |
| |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <string.h> |
| #include <stdlib.h> /* for fdwalk */ |
| #include <dirent.h> |
| |
| #ifdef HAVE_SYS_SELECT_H |
| #include <sys/select.h> |
| #endif /* HAVE_SYS_SELECT_H */ |
| |
| #ifdef HAVE_SYS_RESOURCE_H |
| #include <sys/resource.h> |
| #endif /* HAVE_SYS_RESOURCE_H */ |
| |
| #include "gspawn.h" |
| #include "gthread.h" |
| #include "glib/gstdio.h" |
| |
| #include "genviron.h" |
| #include "gmem.h" |
| #include "gshell.h" |
| #include "gstring.h" |
| #include "gstrfuncs.h" |
| #include "gtestutils.h" |
| #include "gutils.h" |
| #include "glibintl.h" |
| #include "glib-unix.h" |
| |
| /** |
| * SECTION:spawn |
| * @Short_description: process launching |
| * @Title: Spawning Processes |
| * |
| * GLib supports spawning of processes with an API that is more |
| * convenient than the bare UNIX fork() and exec(). |
| * |
| * The g_spawn family of functions has synchronous (g_spawn_sync()) |
| * and asynchronous variants (g_spawn_async(), g_spawn_async_with_pipes()), |
| * as well as convenience variants that take a complete shell-like |
| * commandline (g_spawn_command_line_sync(), g_spawn_command_line_async()). |
| * |
| * See #GSubprocess in GIO for a higher-level API that provides |
| * stream interfaces for communication with child processes. |
| */ |
| |
| |
| |
| static gint g_execute (const gchar *file, |
| gchar **argv, |
| gchar **envp, |
| gboolean search_path, |
| gboolean search_path_from_envp); |
| |
| static gboolean fork_exec_with_pipes (gboolean intermediate_child, |
| const gchar *working_directory, |
| gchar **argv, |
| gchar **envp, |
| gboolean close_descriptors, |
| gboolean search_path, |
| gboolean search_path_from_envp, |
| gboolean stdout_to_null, |
| gboolean stderr_to_null, |
| gboolean child_inherits_stdin, |
| gboolean file_and_argv_zero, |
| gboolean cloexec_pipes, |
| GSpawnChildSetupFunc child_setup, |
| gpointer user_data, |
| GPid *child_pid, |
| gint *standard_input, |
| gint *standard_output, |
| gint *standard_error, |
| GError **error); |
| |
| G_DEFINE_QUARK (g-exec-error-quark, g_spawn_error) |
| G_DEFINE_QUARK (g-spawn-exit-error-quark, g_spawn_exit_error) |
| |
| /** |
| * g_spawn_async: |
| * @working_directory: (type filename) (allow-none): child's current working directory, or %NULL to inherit parent's |
| * @argv: (array zero-terminated=1): child's argument vector |
| * @envp: (array zero-terminated=1) (allow-none): child's environment, or %NULL to inherit parent's |
| * @flags: flags from #GSpawnFlags |
| * @child_setup: (scope async) (allow-none): function to run in the child just before exec() |
| * @user_data: (closure): user data for @child_setup |
| * @child_pid: (out) (allow-none): return location for child process reference, or %NULL |
| * @error: return location for error |
| * |
| * See g_spawn_async_with_pipes() for a full description; this function |
| * simply calls the g_spawn_async_with_pipes() without any pipes. |
| * |
| * You should call g_spawn_close_pid() on the returned child process |
| * reference when you don't need it any more. |
| * |
| * If you are writing a GTK+ application, and the program you are |
| * spawning is a graphical application, too, then you may want to |
| * use gdk_spawn_on_screen() instead to ensure that the spawned program |
| * opens its windows on the right screen. |
| * |
| * Note that the returned @child_pid on Windows is a handle to the child |
| * process and not its identifier. Process handles and process identifiers |
| * are different concepts on Windows. |
| * |
| * Returns: %TRUE on success, %FALSE if error is set |
| **/ |
| gboolean |
| g_spawn_async (const gchar *working_directory, |
| gchar **argv, |
| gchar **envp, |
| GSpawnFlags flags, |
| GSpawnChildSetupFunc child_setup, |
| gpointer user_data, |
| GPid *child_pid, |
| GError **error) |
| { |
| g_return_val_if_fail (argv != NULL, FALSE); |
| |
| return g_spawn_async_with_pipes (working_directory, |
| argv, envp, |
| flags, |
| child_setup, |
| user_data, |
| child_pid, |
| NULL, NULL, NULL, |
| error); |
| } |
| |
| /* Avoids a danger in threaded situations (calling close() |
| * on a file descriptor twice, and another thread has |
| * re-opened it since the first close) |
| */ |
| static void |
| close_and_invalidate (gint *fd) |
| { |
| if (*fd < 0) |
| return; |
| else |
| { |
| (void) g_close (*fd, NULL); |
| *fd = -1; |
| } |
| } |
| |
| /* Some versions of OS X define READ_OK in public headers */ |
| #undef READ_OK |
| |
| typedef enum |
| { |
| READ_FAILED = 0, /* FALSE */ |
| READ_OK, |
| READ_EOF |
| } ReadResult; |
| |
| static ReadResult |
| read_data (GString *str, |
| gint fd, |
| GError **error) |
| { |
| gssize bytes; |
| gchar buf[4096]; |
| |
| again: |
| bytes = read (fd, buf, 4096); |
| |
| if (bytes == 0) |
| return READ_EOF; |
| else if (bytes > 0) |
| { |
| g_string_append_len (str, buf, bytes); |
| return READ_OK; |
| } |
| else if (errno == EINTR) |
| goto again; |
| else |
| { |
| int errsv = errno; |
| |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_READ, |
| _("Failed to read data from child process (%s)"), |
| g_strerror (errsv)); |
| |
| return READ_FAILED; |
| } |
| } |
| |
| /** |
| * g_spawn_sync: |
| * @working_directory: (type filename) (allow-none): child's current working directory, or %NULL to inherit parent's |
| * @argv: (array zero-terminated=1): child's argument vector |
| * @envp: (array zero-terminated=1) (allow-none): child's environment, or %NULL to inherit parent's |
| * @flags: flags from #GSpawnFlags |
| * @child_setup: (scope async) (allow-none): function to run in the child just before exec() |
| * @user_data: (closure): user data for @child_setup |
| * @standard_output: (out) (array zero-terminated=1) (element-type guint8) (allow-none): return location for child output, or %NULL |
| * @standard_error: (out) (array zero-terminated=1) (element-type guint8) (allow-none): return location for child error messages, or %NULL |
| * @exit_status: (out) (allow-none): return location for child exit status, as returned by waitpid(), or %NULL |
| * @error: return location for error, or %NULL |
| * |
| * Executes a child synchronously (waits for the child to exit before returning). |
| * All output from the child is stored in @standard_output and @standard_error, |
| * if those parameters are non-%NULL. Note that you must set the |
| * %G_SPAWN_STDOUT_TO_DEV_NULL and %G_SPAWN_STDERR_TO_DEV_NULL flags when |
| * passing %NULL for @standard_output and @standard_error. |
| * |
| * If @exit_status is non-%NULL, the platform-specific exit status of |
| * the child is stored there; see the documentation of |
| * g_spawn_check_exit_status() for how to use and interpret this. |
| * Note that it is invalid to pass %G_SPAWN_DO_NOT_REAP_CHILD in |
| * @flags. |
| * |
| * If an error occurs, no data is returned in @standard_output, |
| * @standard_error, or @exit_status. |
| * |
| * This function calls g_spawn_async_with_pipes() internally; see that |
| * function for full details on the other parameters and details on |
| * how these functions work on Windows. |
| * |
| * Returns: %TRUE on success, %FALSE if an error was set |
| */ |
| gboolean |
| g_spawn_sync (const gchar *working_directory, |
| gchar **argv, |
| gchar **envp, |
| GSpawnFlags flags, |
| GSpawnChildSetupFunc child_setup, |
| gpointer user_data, |
| gchar **standard_output, |
| gchar **standard_error, |
| gint *exit_status, |
| GError **error) |
| { |
| gint outpipe = -1; |
| gint errpipe = -1; |
| GPid pid; |
| fd_set fds; |
| gint ret; |
| GString *outstr = NULL; |
| GString *errstr = NULL; |
| gboolean failed; |
| gint status; |
| |
| g_return_val_if_fail (argv != NULL, FALSE); |
| g_return_val_if_fail (!(flags & G_SPAWN_DO_NOT_REAP_CHILD), FALSE); |
| g_return_val_if_fail (standard_output == NULL || |
| !(flags & G_SPAWN_STDOUT_TO_DEV_NULL), FALSE); |
| g_return_val_if_fail (standard_error == NULL || |
| !(flags & G_SPAWN_STDERR_TO_DEV_NULL), FALSE); |
| |
| /* Just to ensure segfaults if callers try to use |
| * these when an error is reported. |
| */ |
| if (standard_output) |
| *standard_output = NULL; |
| |
| if (standard_error) |
| *standard_error = NULL; |
| |
| if (!fork_exec_with_pipes (FALSE, |
| working_directory, |
| argv, |
| envp, |
| !(flags & G_SPAWN_LEAVE_DESCRIPTORS_OPEN), |
| (flags & G_SPAWN_SEARCH_PATH) != 0, |
| (flags & G_SPAWN_SEARCH_PATH_FROM_ENVP) != 0, |
| (flags & G_SPAWN_STDOUT_TO_DEV_NULL) != 0, |
| (flags & G_SPAWN_STDERR_TO_DEV_NULL) != 0, |
| (flags & G_SPAWN_CHILD_INHERITS_STDIN) != 0, |
| (flags & G_SPAWN_FILE_AND_ARGV_ZERO) != 0, |
| (flags & G_SPAWN_CLOEXEC_PIPES) != 0, |
| child_setup, |
| user_data, |
| &pid, |
| NULL, |
| standard_output ? &outpipe : NULL, |
| standard_error ? &errpipe : NULL, |
| error)) |
| return FALSE; |
| |
| /* Read data from child. */ |
| |
| failed = FALSE; |
| |
| if (outpipe >= 0) |
| { |
| outstr = g_string_new (NULL); |
| } |
| |
| if (errpipe >= 0) |
| { |
| errstr = g_string_new (NULL); |
| } |
| |
| /* Read data until we get EOF on both pipes. */ |
| while (!failed && |
| (outpipe >= 0 || |
| errpipe >= 0)) |
| { |
| ret = 0; |
| |
| FD_ZERO (&fds); |
| if (outpipe >= 0) |
| FD_SET (outpipe, &fds); |
| if (errpipe >= 0) |
| FD_SET (errpipe, &fds); |
| |
| ret = select (MAX (outpipe, errpipe) + 1, |
| &fds, |
| NULL, NULL, |
| NULL /* no timeout */); |
| |
| if (ret < 0) |
| { |
| int errsv = errno; |
| |
| if (errno == EINTR) |
| continue; |
| |
| failed = TRUE; |
| |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_READ, |
| _("Unexpected error in select() reading data from a child process (%s)"), |
| g_strerror (errsv)); |
| |
| break; |
| } |
| |
| if (outpipe >= 0 && FD_ISSET (outpipe, &fds)) |
| { |
| switch (read_data (outstr, outpipe, error)) |
| { |
| case READ_FAILED: |
| failed = TRUE; |
| break; |
| case READ_EOF: |
| close_and_invalidate (&outpipe); |
| outpipe = -1; |
| break; |
| default: |
| break; |
| } |
| |
| if (failed) |
| break; |
| } |
| |
| if (errpipe >= 0 && FD_ISSET (errpipe, &fds)) |
| { |
| switch (read_data (errstr, errpipe, error)) |
| { |
| case READ_FAILED: |
| failed = TRUE; |
| break; |
| case READ_EOF: |
| close_and_invalidate (&errpipe); |
| errpipe = -1; |
| break; |
| default: |
| break; |
| } |
| |
| if (failed) |
| break; |
| } |
| } |
| |
| /* These should only be open still if we had an error. */ |
| |
| if (outpipe >= 0) |
| close_and_invalidate (&outpipe); |
| if (errpipe >= 0) |
| close_and_invalidate (&errpipe); |
| |
| /* Wait for child to exit, even if we have |
| * an error pending. |
| */ |
| again: |
| |
| ret = waitpid (pid, &status, 0); |
| |
| if (ret < 0) |
| { |
| if (errno == EINTR) |
| goto again; |
| else if (errno == ECHILD) |
| { |
| if (exit_status) |
| { |
| g_warning ("In call to g_spawn_sync(), exit status of a child process was requested but ECHILD was received by waitpid(). Most likely the process is ignoring SIGCHLD, or some other thread is invoking waitpid() with a nonpositive first argument; either behavior can break applications that use g_spawn_sync either directly or indirectly."); |
| } |
| else |
| { |
| /* We don't need the exit status. */ |
| } |
| } |
| else |
| { |
| if (!failed) /* avoid error pileups */ |
| { |
| int errsv = errno; |
| |
| failed = TRUE; |
| |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_READ, |
| _("Unexpected error in waitpid() (%s)"), |
| g_strerror (errsv)); |
| } |
| } |
| } |
| |
| if (failed) |
| { |
| if (outstr) |
| g_string_free (outstr, TRUE); |
| if (errstr) |
| g_string_free (errstr, TRUE); |
| |
| return FALSE; |
| } |
| else |
| { |
| if (exit_status) |
| *exit_status = status; |
| |
| if (standard_output) |
| *standard_output = g_string_free (outstr, FALSE); |
| |
| if (standard_error) |
| *standard_error = g_string_free (errstr, FALSE); |
| |
| return TRUE; |
| } |
| } |
| |
| /** |
| * g_spawn_async_with_pipes: |
| * @working_directory: (type filename) (allow-none): child's current working directory, or %NULL to inherit parent's, in the GLib file name encoding |
| * @argv: (array zero-terminated=1): child's argument vector, in the GLib file name encoding |
| * @envp: (array zero-terminated=1) (allow-none): child's environment, or %NULL to inherit parent's, in the GLib file name encoding |
| * @flags: flags from #GSpawnFlags |
| * @child_setup: (scope async) (allow-none): function to run in the child just before exec() |
| * @user_data: (closure): user data for @child_setup |
| * @child_pid: (out) (allow-none): return location for child process ID, or %NULL |
| * @standard_input: (out) (allow-none): return location for file descriptor to write to child's stdin, or %NULL |
| * @standard_output: (out) (allow-none): return location for file descriptor to read child's stdout, or %NULL |
| * @standard_error: (out) (allow-none): return location for file descriptor to read child's stderr, or %NULL |
| * @error: return location for error |
| * |
| * Executes a child program asynchronously (your program will not |
| * block waiting for the child to exit). The child program is |
| * specified by the only argument that must be provided, @argv. |
| * @argv should be a %NULL-terminated array of strings, to be passed |
| * as the argument vector for the child. The first string in @argv |
| * is of course the name of the program to execute. By default, the |
| * name of the program must be a full path. If @flags contains the |
| * %G_SPAWN_SEARCH_PATH flag, the `PATH` environment variable is |
| * used to search for the executable. If @flags contains the |
| * %G_SPAWN_SEARCH_PATH_FROM_ENVP flag, the `PATH` variable from |
| * @envp is used to search for the executable. If both the |
| * %G_SPAWN_SEARCH_PATH and %G_SPAWN_SEARCH_PATH_FROM_ENVP flags |
| * are set, the `PATH` variable from @envp takes precedence over |
| * the environment variable. |
| * |
| * If the program name is not a full path and %G_SPAWN_SEARCH_PATH flag is not |
| * used, then the program will be run from the current directory (or |
| * @working_directory, if specified); this might be unexpected or even |
| * dangerous in some cases when the current directory is world-writable. |
| * |
| * On Windows, note that all the string or string vector arguments to |
| * this function and the other g_spawn*() functions are in UTF-8, the |
| * GLib file name encoding. Unicode characters that are not part of |
| * the system codepage passed in these arguments will be correctly |
| * available in the spawned program only if it uses wide character API |
| * to retrieve its command line. For C programs built with Microsoft's |
| * tools it is enough to make the program have a wmain() instead of |
| * main(). wmain() has a wide character argument vector as parameter. |
| * |
| * At least currently, mingw doesn't support wmain(), so if you use |
| * mingw to develop the spawned program, it should call |
| * g_win32_get_command_line() to get arguments in UTF-8. |
| * |
| * On Windows the low-level child process creation API CreateProcess() |
| * doesn't use argument vectors, but a command line. The C runtime |
| * library's spawn*() family of functions (which g_spawn_async_with_pipes() |
| * eventually calls) paste the argument vector elements together into |
| * a command line, and the C runtime startup code does a corresponding |
| * reconstruction of an argument vector from the command line, to be |
| * passed to main(). Complications arise when you have argument vector |
| * elements that contain spaces of double quotes. The spawn*() functions |
| * don't do any quoting or escaping, but on the other hand the startup |
| * code does do unquoting and unescaping in order to enable receiving |
| * arguments with embedded spaces or double quotes. To work around this |
| * asymmetry, g_spawn_async_with_pipes() will do quoting and escaping on |
| * argument vector elements that need it before calling the C runtime |
| * spawn() function. |
| * |
| * The returned @child_pid on Windows is a handle to the child |
| * process, not its identifier. Process handles and process |
| * identifiers are different concepts on Windows. |
| * |
| * @envp is a %NULL-terminated array of strings, where each string |
| * has the form `KEY=VALUE`. This will become the child's environment. |
| * If @envp is %NULL, the child inherits its parent's environment. |
| * |
| * @flags should be the bitwise OR of any flags you want to affect the |
| * function's behaviour. The %G_SPAWN_DO_NOT_REAP_CHILD means that the |
| * child will not automatically be reaped; you must use a child watch to |
| * be notified about the death of the child process. Eventually you must |
| * call g_spawn_close_pid() on the @child_pid, in order to free |
| * resources which may be associated with the child process. (On Unix, |
| * using a child watch is equivalent to calling waitpid() or handling |
| * the %SIGCHLD signal manually. On Windows, calling g_spawn_close_pid() |
| * is equivalent to calling CloseHandle() on the process handle returned |
| * in @child_pid). See g_child_watch_add(). |
| * |
| * %G_SPAWN_LEAVE_DESCRIPTORS_OPEN means that the parent's open file |
| * descriptors will be inherited by the child; otherwise all descriptors |
| * except stdin/stdout/stderr will be closed before calling exec() in |
| * the child. %G_SPAWN_SEARCH_PATH means that @argv[0] need not be an |
| * absolute path, it will be looked for in the `PATH` environment |
| * variable. %G_SPAWN_SEARCH_PATH_FROM_ENVP means need not be an |
| * absolute path, it will be looked for in the `PATH` variable from |
| * @envp. If both %G_SPAWN_SEARCH_PATH and %G_SPAWN_SEARCH_PATH_FROM_ENVP |
| * are used, the value from @envp takes precedence over the environment. |
| * %G_SPAWN_STDOUT_TO_DEV_NULL means that the child's standard output |
| * will be discarded, instead of going to the same location as the parent's |
| * standard output. If you use this flag, @standard_output must be %NULL. |
| * %G_SPAWN_STDERR_TO_DEV_NULL means that the child's standard error |
| * will be discarded, instead of going to the same location as the parent's |
| * standard error. If you use this flag, @standard_error must be %NULL. |
| * %G_SPAWN_CHILD_INHERITS_STDIN means that the child will inherit the parent's |
| * standard input (by default, the child's standard input is attached to |
| * /dev/null). If you use this flag, @standard_input must be %NULL. |
| * %G_SPAWN_FILE_AND_ARGV_ZERO means that the first element of @argv is |
| * the file to execute, while the remaining elements are the actual |
| * argument vector to pass to the file. Normally g_spawn_async_with_pipes() |
| * uses @argv[0] as the file to execute, and passes all of @argv to the child. |
| * |
| * @child_setup and @user_data are a function and user data. On POSIX |
| * platforms, the function is called in the child after GLib has |
| * performed all the setup it plans to perform (including creating |
| * pipes, closing file descriptors, etc.) but before calling exec(). |
| * That is, @child_setup is called just before calling exec() in the |
| * child. Obviously actions taken in this function will only affect |
| * the child, not the parent. |
| * |
| * On Windows, there is no separate fork() and exec() functionality. |
| * Child processes are created and run with a single API call, |
| * CreateProcess(). There is no sensible thing @child_setup |
| * could be used for on Windows so it is ignored and not called. |
| * |
| * If non-%NULL, @child_pid will on Unix be filled with the child's |
| * process ID. You can use the process ID to send signals to the child, |
| * or to use g_child_watch_add() (or waitpid()) if you specified the |
| * %G_SPAWN_DO_NOT_REAP_CHILD flag. On Windows, @child_pid will be |
| * filled with a handle to the child process only if you specified the |
| * %G_SPAWN_DO_NOT_REAP_CHILD flag. You can then access the child |
| * process using the Win32 API, for example wait for its termination |
| * with the WaitFor*() functions, or examine its exit code with |
| * GetExitCodeProcess(). You should close the handle with CloseHandle() |
| * or g_spawn_close_pid() when you no longer need it. |
| * |
| * If non-%NULL, the @standard_input, @standard_output, @standard_error |
| * locations will be filled with file descriptors for writing to the child's |
| * standard input or reading from its standard output or standard error. |
| * The caller of g_spawn_async_with_pipes() must close these file descriptors |
| * when they are no longer in use. If these parameters are %NULL, the |
| * corresponding pipe won't be created. |
| * |
| * If @standard_input is NULL, the child's standard input is attached to |
| * /dev/null unless %G_SPAWN_CHILD_INHERITS_STDIN is set. |
| * |
| * If @standard_error is NULL, the child's standard error goes to the same |
| * location as the parent's standard error unless %G_SPAWN_STDERR_TO_DEV_NULL |
| * is set. |
| * |
| * If @standard_output is NULL, the child's standard output goes to the same |
| * location as the parent's standard output unless %G_SPAWN_STDOUT_TO_DEV_NULL |
| * is set. |
| * |
| * @error can be %NULL to ignore errors, or non-%NULL to report errors. |
| * If an error is set, the function returns %FALSE. Errors are reported |
| * even if they occur in the child (for example if the executable in |
| * @argv[0] is not found). Typically the `message` field of returned |
| * errors should be displayed to users. Possible errors are those from |
| * the #G_SPAWN_ERROR domain. |
| * |
| * If an error occurs, @child_pid, @standard_input, @standard_output, |
| * and @standard_error will not be filled with valid values. |
| * |
| * If @child_pid is not %NULL and an error does not occur then the returned |
| * process reference must be closed using g_spawn_close_pid(). |
| * |
| * If you are writing a GTK+ application, and the program you |
| * are spawning is a graphical application, too, then you may |
| * want to use gdk_spawn_on_screen_with_pipes() instead to ensure that |
| * the spawned program opens its windows on the right screen. |
| * |
| * Returns: %TRUE on success, %FALSE if an error was set |
| */ |
| gboolean |
| g_spawn_async_with_pipes (const gchar *working_directory, |
| gchar **argv, |
| gchar **envp, |
| GSpawnFlags flags, |
| GSpawnChildSetupFunc child_setup, |
| gpointer user_data, |
| GPid *child_pid, |
| gint *standard_input, |
| gint *standard_output, |
| gint *standard_error, |
| GError **error) |
| { |
| g_return_val_if_fail (argv != NULL, FALSE); |
| g_return_val_if_fail (standard_output == NULL || |
| !(flags & G_SPAWN_STDOUT_TO_DEV_NULL), FALSE); |
| g_return_val_if_fail (standard_error == NULL || |
| !(flags & G_SPAWN_STDERR_TO_DEV_NULL), FALSE); |
| /* can't inherit stdin if we have an input pipe. */ |
| g_return_val_if_fail (standard_input == NULL || |
| !(flags & G_SPAWN_CHILD_INHERITS_STDIN), FALSE); |
| |
| return fork_exec_with_pipes (!(flags & G_SPAWN_DO_NOT_REAP_CHILD), |
| working_directory, |
| argv, |
| envp, |
| !(flags & G_SPAWN_LEAVE_DESCRIPTORS_OPEN), |
| (flags & G_SPAWN_SEARCH_PATH) != 0, |
| (flags & G_SPAWN_SEARCH_PATH_FROM_ENVP) != 0, |
| (flags & G_SPAWN_STDOUT_TO_DEV_NULL) != 0, |
| (flags & G_SPAWN_STDERR_TO_DEV_NULL) != 0, |
| (flags & G_SPAWN_CHILD_INHERITS_STDIN) != 0, |
| (flags & G_SPAWN_FILE_AND_ARGV_ZERO) != 0, |
| (flags & G_SPAWN_CLOEXEC_PIPES) != 0, |
| child_setup, |
| user_data, |
| child_pid, |
| standard_input, |
| standard_output, |
| standard_error, |
| error); |
| } |
| |
| /** |
| * g_spawn_command_line_sync: |
| * @command_line: a command line |
| * @standard_output: (out) (array zero-terminated=1) (element-type guint8) (allow-none): return location for child output |
| * @standard_error: (out) (array zero-terminated=1) (element-type guint8) (allow-none): return location for child errors |
| * @exit_status: (out) (allow-none): return location for child exit status, as returned by waitpid() |
| * @error: return location for errors |
| * |
| * A simple version of g_spawn_sync() with little-used parameters |
| * removed, taking a command line instead of an argument vector. See |
| * g_spawn_sync() for full details. @command_line will be parsed by |
| * g_shell_parse_argv(). Unlike g_spawn_sync(), the %G_SPAWN_SEARCH_PATH flag |
| * is enabled. Note that %G_SPAWN_SEARCH_PATH can have security |
| * implications, so consider using g_spawn_sync() directly if |
| * appropriate. Possible errors are those from g_spawn_sync() and those |
| * from g_shell_parse_argv(). |
| * |
| * If @exit_status is non-%NULL, the platform-specific exit status of |
| * the child is stored there; see the documentation of |
| * g_spawn_check_exit_status() for how to use and interpret this. |
| * |
| * On Windows, please note the implications of g_shell_parse_argv() |
| * parsing @command_line. Parsing is done according to Unix shell rules, not |
| * Windows command interpreter rules. |
| * Space is a separator, and backslashes are |
| * special. Thus you cannot simply pass a @command_line containing |
| * canonical Windows paths, like "c:\\program files\\app\\app.exe", as |
| * the backslashes will be eaten, and the space will act as a |
| * separator. You need to enclose such paths with single quotes, like |
| * "'c:\\program files\\app\\app.exe' 'e:\\folder\\argument.txt'". |
| * |
| * Returns: %TRUE on success, %FALSE if an error was set |
| **/ |
| gboolean |
| g_spawn_command_line_sync (const gchar *command_line, |
| gchar **standard_output, |
| gchar **standard_error, |
| gint *exit_status, |
| GError **error) |
| { |
| gboolean retval; |
| gchar **argv = NULL; |
| |
| g_return_val_if_fail (command_line != NULL, FALSE); |
| |
| if (!g_shell_parse_argv (command_line, |
| NULL, &argv, |
| error)) |
| return FALSE; |
| |
| retval = g_spawn_sync (NULL, |
| argv, |
| NULL, |
| G_SPAWN_SEARCH_PATH, |
| NULL, |
| NULL, |
| standard_output, |
| standard_error, |
| exit_status, |
| error); |
| g_strfreev (argv); |
| |
| return retval; |
| } |
| |
| /** |
| * g_spawn_command_line_async: |
| * @command_line: a command line |
| * @error: return location for errors |
| * |
| * A simple version of g_spawn_async() that parses a command line with |
| * g_shell_parse_argv() and passes it to g_spawn_async(). Runs a |
| * command line in the background. Unlike g_spawn_async(), the |
| * %G_SPAWN_SEARCH_PATH flag is enabled, other flags are not. Note |
| * that %G_SPAWN_SEARCH_PATH can have security implications, so |
| * consider using g_spawn_async() directly if appropriate. Possible |
| * errors are those from g_shell_parse_argv() and g_spawn_async(). |
| * |
| * The same concerns on Windows apply as for g_spawn_command_line_sync(). |
| * |
| * Returns: %TRUE on success, %FALSE if error is set |
| **/ |
| gboolean |
| g_spawn_command_line_async (const gchar *command_line, |
| GError **error) |
| { |
| gboolean retval; |
| gchar **argv = NULL; |
| |
| g_return_val_if_fail (command_line != NULL, FALSE); |
| |
| if (!g_shell_parse_argv (command_line, |
| NULL, &argv, |
| error)) |
| return FALSE; |
| |
| retval = g_spawn_async (NULL, |
| argv, |
| NULL, |
| G_SPAWN_SEARCH_PATH, |
| NULL, |
| NULL, |
| NULL, |
| error); |
| g_strfreev (argv); |
| |
| return retval; |
| } |
| |
| /** |
| * g_spawn_check_exit_status: |
| * @exit_status: An exit code as returned from g_spawn_sync() |
| * @error: a #GError |
| * |
| * Set @error if @exit_status indicates the child exited abnormally |
| * (e.g. with a nonzero exit code, or via a fatal signal). |
| * |
| * The g_spawn_sync() and g_child_watch_add() family of APIs return an |
| * exit status for subprocesses encoded in a platform-specific way. |
| * On Unix, this is guaranteed to be in the same format waitpid() returns, |
| * and on Windows it is guaranteed to be the result of GetExitCodeProcess(). |
| * |
| * Prior to the introduction of this function in GLib 2.34, interpreting |
| * @exit_status required use of platform-specific APIs, which is problematic |
| * for software using GLib as a cross-platform layer. |
| * |
| * Additionally, many programs simply want to determine whether or not |
| * the child exited successfully, and either propagate a #GError or |
| * print a message to standard error. In that common case, this function |
| * can be used. Note that the error message in @error will contain |
| * human-readable information about the exit status. |
| * |
| * The @domain and @code of @error have special semantics in the case |
| * where the process has an "exit code", as opposed to being killed by |
| * a signal. On Unix, this happens if WIFEXITED() would be true of |
| * @exit_status. On Windows, it is always the case. |
| * |
| * The special semantics are that the actual exit code will be the |
| * code set in @error, and the domain will be %G_SPAWN_EXIT_ERROR. |
| * This allows you to differentiate between different exit codes. |
| * |
| * If the process was terminated by some means other than an exit |
| * status, the domain will be %G_SPAWN_ERROR, and the code will be |
| * %G_SPAWN_ERROR_FAILED. |
| * |
| * This function just offers convenience; you can of course also check |
| * the available platform via a macro such as %G_OS_UNIX, and use |
| * WIFEXITED() and WEXITSTATUS() on @exit_status directly. Do not attempt |
| * to scan or parse the error message string; it may be translated and/or |
| * change in future versions of GLib. |
| * |
| * Returns: %TRUE if child exited successfully, %FALSE otherwise (and |
| * @error will be set) |
| * |
| * Since: 2.34 |
| */ |
| gboolean |
| g_spawn_check_exit_status (gint exit_status, |
| GError **error) |
| { |
| gboolean ret = FALSE; |
| |
| if (WIFEXITED (exit_status)) |
| { |
| if (WEXITSTATUS (exit_status) != 0) |
| { |
| g_set_error (error, G_SPAWN_EXIT_ERROR, WEXITSTATUS (exit_status), |
| _("Child process exited with code %ld"), |
| (long) WEXITSTATUS (exit_status)); |
| goto out; |
| } |
| } |
| else if (WIFSIGNALED (exit_status)) |
| { |
| g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED, |
| _("Child process killed by signal %ld"), |
| (long) WTERMSIG (exit_status)); |
| goto out; |
| } |
| else if (WIFSTOPPED (exit_status)) |
| { |
| g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED, |
| _("Child process stopped by signal %ld"), |
| (long) WSTOPSIG (exit_status)); |
| goto out; |
| } |
| else |
| { |
| g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED, |
| _("Child process exited abnormally")); |
| goto out; |
| } |
| |
| ret = TRUE; |
| out: |
| return ret; |
| } |
| |
| static gint |
| exec_err_to_g_error (gint en) |
| { |
| switch (en) |
| { |
| #ifdef EACCES |
| case EACCES: |
| return G_SPAWN_ERROR_ACCES; |
| break; |
| #endif |
| |
| #ifdef EPERM |
| case EPERM: |
| return G_SPAWN_ERROR_PERM; |
| break; |
| #endif |
| |
| #ifdef E2BIG |
| case E2BIG: |
| return G_SPAWN_ERROR_TOO_BIG; |
| break; |
| #endif |
| |
| #ifdef ENOEXEC |
| case ENOEXEC: |
| return G_SPAWN_ERROR_NOEXEC; |
| break; |
| #endif |
| |
| #ifdef ENAMETOOLONG |
| case ENAMETOOLONG: |
| return G_SPAWN_ERROR_NAMETOOLONG; |
| break; |
| #endif |
| |
| #ifdef ENOENT |
| case ENOENT: |
| return G_SPAWN_ERROR_NOENT; |
| break; |
| #endif |
| |
| #ifdef ENOMEM |
| case ENOMEM: |
| return G_SPAWN_ERROR_NOMEM; |
| break; |
| #endif |
| |
| #ifdef ENOTDIR |
| case ENOTDIR: |
| return G_SPAWN_ERROR_NOTDIR; |
| break; |
| #endif |
| |
| #ifdef ELOOP |
| case ELOOP: |
| return G_SPAWN_ERROR_LOOP; |
| break; |
| #endif |
| |
| #ifdef ETXTBUSY |
| case ETXTBUSY: |
| return G_SPAWN_ERROR_TXTBUSY; |
| break; |
| #endif |
| |
| #ifdef EIO |
| case EIO: |
| return G_SPAWN_ERROR_IO; |
| break; |
| #endif |
| |
| #ifdef ENFILE |
| case ENFILE: |
| return G_SPAWN_ERROR_NFILE; |
| break; |
| #endif |
| |
| #ifdef EMFILE |
| case EMFILE: |
| return G_SPAWN_ERROR_MFILE; |
| break; |
| #endif |
| |
| #ifdef EINVAL |
| case EINVAL: |
| return G_SPAWN_ERROR_INVAL; |
| break; |
| #endif |
| |
| #ifdef EISDIR |
| case EISDIR: |
| return G_SPAWN_ERROR_ISDIR; |
| break; |
| #endif |
| |
| #ifdef ELIBBAD |
| case ELIBBAD: |
| return G_SPAWN_ERROR_LIBBAD; |
| break; |
| #endif |
| |
| default: |
| return G_SPAWN_ERROR_FAILED; |
| break; |
| } |
| } |
| |
| static gssize |
| write_all (gint fd, gconstpointer vbuf, gsize to_write) |
| { |
| gchar *buf = (gchar *) vbuf; |
| |
| while (to_write > 0) |
| { |
| gssize count = write (fd, buf, to_write); |
| if (count < 0) |
| { |
| if (errno != EINTR) |
| return FALSE; |
| } |
| else |
| { |
| to_write -= count; |
| buf += count; |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| G_GNUC_NORETURN |
| static void |
| write_err_and_exit (gint fd, gint msg) |
| { |
| gint en = errno; |
| |
| write_all (fd, &msg, sizeof(msg)); |
| write_all (fd, &en, sizeof(en)); |
| |
| _exit (1); |
| } |
| |
| static int |
| set_cloexec (void *data, gint fd) |
| { |
| if (fd >= GPOINTER_TO_INT (data)) |
| fcntl (fd, F_SETFD, FD_CLOEXEC); |
| |
| return 0; |
| } |
| |
| #ifndef HAVE_FDWALK |
| static int |
| fdwalk (int (*cb)(void *data, int fd), void *data) |
| { |
| gint open_max; |
| gint fd; |
| gint res = 0; |
| |
| #ifdef HAVE_SYS_RESOURCE_H |
| struct rlimit rl; |
| #endif |
| |
| #ifdef __linux__ |
| DIR *d; |
| |
| if ((d = opendir("/proc/self/fd"))) { |
| struct dirent *de; |
| |
| while ((de = readdir(d))) { |
| glong l; |
| gchar *e = NULL; |
| |
| if (de->d_name[0] == '.') |
| continue; |
| |
| errno = 0; |
| l = strtol(de->d_name, &e, 10); |
| if (errno != 0 || !e || *e) |
| continue; |
| |
| fd = (gint) l; |
| |
| if ((glong) fd != l) |
| continue; |
| |
| if (fd == dirfd(d)) |
| continue; |
| |
| if ((res = cb (data, fd)) != 0) |
| break; |
| } |
| |
| closedir(d); |
| return res; |
| } |
| |
| /* If /proc is not mounted or not accessible we fall back to the old |
| * rlimit trick */ |
| |
| #endif |
| |
| #ifdef HAVE_SYS_RESOURCE_H |
| |
| if (getrlimit(RLIMIT_NOFILE, &rl) == 0 && rl.rlim_max != RLIM_INFINITY) |
| open_max = rl.rlim_max; |
| else |
| #endif |
| open_max = sysconf (_SC_OPEN_MAX); |
| |
| for (fd = 0; fd < open_max; fd++) |
| if ((res = cb (data, fd)) != 0) |
| break; |
| |
| return res; |
| } |
| #endif |
| |
| static gint |
| sane_dup2 (gint fd1, gint fd2) |
| { |
| gint ret; |
| |
| retry: |
| ret = dup2 (fd1, fd2); |
| if (ret < 0 && errno == EINTR) |
| goto retry; |
| |
| return ret; |
| } |
| |
| static gint |
| sane_open (const char *path, gint mode) |
| { |
| gint ret; |
| |
| retry: |
| ret = open (path, mode); |
| if (ret < 0 && errno == EINTR) |
| goto retry; |
| |
| return ret; |
| } |
| |
| enum |
| { |
| CHILD_CHDIR_FAILED, |
| CHILD_EXEC_FAILED, |
| CHILD_DUP2_FAILED, |
| CHILD_FORK_FAILED |
| }; |
| |
| static void |
| do_exec (gint child_err_report_fd, |
| gint stdin_fd, |
| gint stdout_fd, |
| gint stderr_fd, |
| const gchar *working_directory, |
| gchar **argv, |
| gchar **envp, |
| gboolean close_descriptors, |
| gboolean search_path, |
| gboolean search_path_from_envp, |
| gboolean stdout_to_null, |
| gboolean stderr_to_null, |
| gboolean child_inherits_stdin, |
| gboolean file_and_argv_zero, |
| GSpawnChildSetupFunc child_setup, |
| gpointer user_data) |
| { |
| if (working_directory && chdir (working_directory) < 0) |
| write_err_and_exit (child_err_report_fd, |
| CHILD_CHDIR_FAILED); |
| |
| /* Close all file descriptors but stdin stdout and stderr as |
| * soon as we exec. Note that this includes |
| * child_err_report_fd, which keeps the parent from blocking |
| * forever on the other end of that pipe. |
| */ |
| if (close_descriptors) |
| { |
| fdwalk (set_cloexec, GINT_TO_POINTER(3)); |
| } |
| else |
| { |
| /* We need to do child_err_report_fd anyway */ |
| set_cloexec (GINT_TO_POINTER(0), child_err_report_fd); |
| } |
| |
| /* Redirect pipes as required */ |
| |
| if (stdin_fd >= 0) |
| { |
| /* dup2 can't actually fail here I don't think */ |
| |
| if (sane_dup2 (stdin_fd, 0) < 0) |
| write_err_and_exit (child_err_report_fd, |
| CHILD_DUP2_FAILED); |
| |
| /* ignore this if it doesn't work */ |
| close_and_invalidate (&stdin_fd); |
| } |
| else if (!child_inherits_stdin) |
| { |
| /* Keep process from blocking on a read of stdin */ |
| gint read_null = open ("/dev/null", O_RDONLY); |
| g_assert (read_null != -1); |
| sane_dup2 (read_null, 0); |
| close_and_invalidate (&read_null); |
| } |
| |
| if (stdout_fd >= 0) |
| { |
| /* dup2 can't actually fail here I don't think */ |
| |
| if (sane_dup2 (stdout_fd, 1) < 0) |
| write_err_and_exit (child_err_report_fd, |
| CHILD_DUP2_FAILED); |
| |
| /* ignore this if it doesn't work */ |
| close_and_invalidate (&stdout_fd); |
| } |
| else if (stdout_to_null) |
| { |
| gint write_null = sane_open ("/dev/null", O_WRONLY); |
| g_assert (write_null != -1); |
| sane_dup2 (write_null, 1); |
| close_and_invalidate (&write_null); |
| } |
| |
| if (stderr_fd >= 0) |
| { |
| /* dup2 can't actually fail here I don't think */ |
| |
| if (sane_dup2 (stderr_fd, 2) < 0) |
| write_err_and_exit (child_err_report_fd, |
| CHILD_DUP2_FAILED); |
| |
| /* ignore this if it doesn't work */ |
| close_and_invalidate (&stderr_fd); |
| } |
| else if (stderr_to_null) |
| { |
| gint write_null = sane_open ("/dev/null", O_WRONLY); |
| sane_dup2 (write_null, 2); |
| close_and_invalidate (&write_null); |
| } |
| |
| /* Call user function just before we exec */ |
| if (child_setup) |
| { |
| (* child_setup) (user_data); |
| } |
| |
| g_execute (argv[0], |
| file_and_argv_zero ? argv + 1 : argv, |
| envp, search_path, search_path_from_envp); |
| |
| /* Exec failed */ |
| write_err_and_exit (child_err_report_fd, |
| CHILD_EXEC_FAILED); |
| } |
| |
| static gboolean |
| read_ints (int fd, |
| gint* buf, |
| gint n_ints_in_buf, |
| gint *n_ints_read, |
| GError **error) |
| { |
| gsize bytes = 0; |
| |
| while (TRUE) |
| { |
| gssize chunk; |
| |
| if (bytes >= sizeof(gint)*2) |
| break; /* give up, who knows what happened, should not be |
| * possible. |
| */ |
| |
| again: |
| chunk = read (fd, |
| ((gchar*)buf) + bytes, |
| sizeof(gint) * n_ints_in_buf - bytes); |
| if (chunk < 0 && errno == EINTR) |
| goto again; |
| |
| if (chunk < 0) |
| { |
| int errsv = errno; |
| |
| /* Some weird shit happened, bail out */ |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_FAILED, |
| _("Failed to read from child pipe (%s)"), |
| g_strerror (errsv)); |
| |
| return FALSE; |
| } |
| else if (chunk == 0) |
| break; /* EOF */ |
| else /* chunk > 0 */ |
| bytes += chunk; |
| } |
| |
| *n_ints_read = (gint)(bytes / sizeof(gint)); |
| |
| return TRUE; |
| } |
| |
| static gboolean |
| fork_exec_with_pipes (gboolean intermediate_child, |
| const gchar *working_directory, |
| gchar **argv, |
| gchar **envp, |
| gboolean close_descriptors, |
| gboolean search_path, |
| gboolean search_path_from_envp, |
| gboolean stdout_to_null, |
| gboolean stderr_to_null, |
| gboolean child_inherits_stdin, |
| gboolean file_and_argv_zero, |
| gboolean cloexec_pipes, |
| GSpawnChildSetupFunc child_setup, |
| gpointer user_data, |
| GPid *child_pid, |
| gint *standard_input, |
| gint *standard_output, |
| gint *standard_error, |
| GError **error) |
| { |
| GPid pid = -1; |
| gint stdin_pipe[2] = { -1, -1 }; |
| gint stdout_pipe[2] = { -1, -1 }; |
| gint stderr_pipe[2] = { -1, -1 }; |
| gint child_err_report_pipe[2] = { -1, -1 }; |
| gint child_pid_report_pipe[2] = { -1, -1 }; |
| guint pipe_flags = cloexec_pipes ? FD_CLOEXEC : 0; |
| gint status; |
| |
| if (!g_unix_open_pipe (child_err_report_pipe, pipe_flags, error)) |
| return FALSE; |
| |
| if (intermediate_child && !g_unix_open_pipe (child_pid_report_pipe, pipe_flags, error)) |
| goto cleanup_and_fail; |
| |
| if (standard_input && !g_unix_open_pipe (stdin_pipe, pipe_flags, error)) |
| goto cleanup_and_fail; |
| |
| if (standard_output && !g_unix_open_pipe (stdout_pipe, pipe_flags, error)) |
| goto cleanup_and_fail; |
| |
| if (standard_error && !g_unix_open_pipe (stderr_pipe, FD_CLOEXEC, error)) |
| goto cleanup_and_fail; |
| |
| pid = fork (); |
| |
| if (pid < 0) |
| { |
| int errsv = errno; |
| |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_FORK, |
| _("Failed to fork (%s)"), |
| g_strerror (errsv)); |
| |
| goto cleanup_and_fail; |
| } |
| else if (pid == 0) |
| { |
| /* Immediate child. This may or may not be the child that |
| * actually execs the new process. |
| */ |
| |
| /* Reset some signal handlers that we may use */ |
| signal (SIGCHLD, SIG_DFL); |
| signal (SIGINT, SIG_DFL); |
| signal (SIGTERM, SIG_DFL); |
| signal (SIGHUP, SIG_DFL); |
| |
| /* Be sure we crash if the parent exits |
| * and we write to the err_report_pipe |
| */ |
| signal (SIGPIPE, SIG_DFL); |
| |
| /* Close the parent's end of the pipes; |
| * not needed in the close_descriptors case, |
| * though |
| */ |
| close_and_invalidate (&child_err_report_pipe[0]); |
| close_and_invalidate (&child_pid_report_pipe[0]); |
| close_and_invalidate (&stdin_pipe[1]); |
| close_and_invalidate (&stdout_pipe[0]); |
| close_and_invalidate (&stderr_pipe[0]); |
| |
| if (intermediate_child) |
| { |
| /* We need to fork an intermediate child that launches the |
| * final child. The purpose of the intermediate child |
| * is to exit, so we can waitpid() it immediately. |
| * Then the grandchild will not become a zombie. |
| */ |
| GPid grandchild_pid; |
| |
| grandchild_pid = fork (); |
| |
| if (grandchild_pid < 0) |
| { |
| /* report -1 as child PID */ |
| write_all (child_pid_report_pipe[1], &grandchild_pid, |
| sizeof(grandchild_pid)); |
| |
| write_err_and_exit (child_err_report_pipe[1], |
| CHILD_FORK_FAILED); |
| } |
| else if (grandchild_pid == 0) |
| { |
| close_and_invalidate (&child_pid_report_pipe[1]); |
| do_exec (child_err_report_pipe[1], |
| stdin_pipe[0], |
| stdout_pipe[1], |
| stderr_pipe[1], |
| working_directory, |
| argv, |
| envp, |
| close_descriptors, |
| search_path, |
| search_path_from_envp, |
| stdout_to_null, |
| stderr_to_null, |
| child_inherits_stdin, |
| file_and_argv_zero, |
| child_setup, |
| user_data); |
| } |
| else |
| { |
| write_all (child_pid_report_pipe[1], &grandchild_pid, sizeof(grandchild_pid)); |
| close_and_invalidate (&child_pid_report_pipe[1]); |
| |
| _exit (0); |
| } |
| } |
| else |
| { |
| /* Just run the child. |
| */ |
| |
| do_exec (child_err_report_pipe[1], |
| stdin_pipe[0], |
| stdout_pipe[1], |
| stderr_pipe[1], |
| working_directory, |
| argv, |
| envp, |
| close_descriptors, |
| search_path, |
| search_path_from_envp, |
| stdout_to_null, |
| stderr_to_null, |
| child_inherits_stdin, |
| file_and_argv_zero, |
| child_setup, |
| user_data); |
| } |
| } |
| else |
| { |
| /* Parent */ |
| |
| gint buf[2]; |
| gint n_ints = 0; |
| |
| /* Close the uncared-about ends of the pipes */ |
| close_and_invalidate (&child_err_report_pipe[1]); |
| close_and_invalidate (&child_pid_report_pipe[1]); |
| close_and_invalidate (&stdin_pipe[0]); |
| close_and_invalidate (&stdout_pipe[1]); |
| close_and_invalidate (&stderr_pipe[1]); |
| |
| /* If we had an intermediate child, reap it */ |
| if (intermediate_child) |
| { |
| wait_again: |
| if (waitpid (pid, &status, 0) < 0) |
| { |
| if (errno == EINTR) |
| goto wait_again; |
| else if (errno == ECHILD) |
| ; /* do nothing, child already reaped */ |
| else |
| g_warning ("waitpid() should not fail in " |
| "'fork_exec_with_pipes'"); |
| } |
| } |
| |
| |
| if (!read_ints (child_err_report_pipe[0], |
| buf, 2, &n_ints, |
| error)) |
| goto cleanup_and_fail; |
| |
| if (n_ints >= 2) |
| { |
| /* Error from the child. */ |
| |
| switch (buf[0]) |
| { |
| case CHILD_CHDIR_FAILED: |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_CHDIR, |
| _("Failed to change to directory '%s' (%s)"), |
| working_directory, |
| g_strerror (buf[1])); |
| |
| break; |
| |
| case CHILD_EXEC_FAILED: |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| exec_err_to_g_error (buf[1]), |
| _("Failed to execute child process \"%s\" (%s)"), |
| argv[0], |
| g_strerror (buf[1])); |
| |
| break; |
| |
| case CHILD_DUP2_FAILED: |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_FAILED, |
| _("Failed to redirect output or input of child process (%s)"), |
| g_strerror (buf[1])); |
| |
| break; |
| |
| case CHILD_FORK_FAILED: |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_FORK, |
| _("Failed to fork child process (%s)"), |
| g_strerror (buf[1])); |
| break; |
| |
| default: |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_FAILED, |
| _("Unknown error executing child process \"%s\""), |
| argv[0]); |
| break; |
| } |
| |
| goto cleanup_and_fail; |
| } |
| |
| /* Get child pid from intermediate child pipe. */ |
| if (intermediate_child) |
| { |
| n_ints = 0; |
| |
| if (!read_ints (child_pid_report_pipe[0], |
| buf, 1, &n_ints, error)) |
| goto cleanup_and_fail; |
| |
| if (n_ints < 1) |
| { |
| int errsv = errno; |
| |
| g_set_error (error, |
| G_SPAWN_ERROR, |
| G_SPAWN_ERROR_FAILED, |
| _("Failed to read enough data from child pid pipe (%s)"), |
| g_strerror (errsv)); |
| goto cleanup_and_fail; |
| } |
| else |
| { |
| /* we have the child pid */ |
| pid = buf[0]; |
| } |
| } |
| |
| /* Success against all odds! return the information */ |
| close_and_invalidate (&child_err_report_pipe[0]); |
| close_and_invalidate (&child_pid_report_pipe[0]); |
| |
| if (child_pid) |
| *child_pid = pid; |
| |
| if (standard_input) |
| *standard_input = stdin_pipe[1]; |
| if (standard_output) |
| *standard_output = stdout_pipe[0]; |
| if (standard_error) |
| *standard_error = stderr_pipe[0]; |
| |
| return TRUE; |
| } |
| |
| cleanup_and_fail: |
| |
| /* There was an error from the Child, reap the child to avoid it being |
| a zombie. |
| */ |
| |
| if (pid > 0) |
| { |
| wait_failed: |
| if (waitpid (pid, NULL, 0) < 0) |
| { |
| if (errno == EINTR) |
| goto wait_failed; |
| else if (errno == ECHILD) |
| ; /* do nothing, child already reaped */ |
| else |
| g_warning ("waitpid() should not fail in " |
| "'fork_exec_with_pipes'"); |
| } |
| } |
| |
| close_and_invalidate (&child_err_report_pipe[0]); |
| close_and_invalidate (&child_err_report_pipe[1]); |
| close_and_invalidate (&child_pid_report_pipe[0]); |
| close_and_invalidate (&child_pid_report_pipe[1]); |
| close_and_invalidate (&stdin_pipe[0]); |
| close_and_invalidate (&stdin_pipe[1]); |
| close_and_invalidate (&stdout_pipe[0]); |
| close_and_invalidate (&stdout_pipe[1]); |
| close_and_invalidate (&stderr_pipe[0]); |
| close_and_invalidate (&stderr_pipe[1]); |
| |
| return FALSE; |
| } |
| |
| /* Based on execvp from GNU C Library */ |
| |
| static void |
| script_execute (const gchar *file, |
| gchar **argv, |
| gchar **envp) |
| { |
| /* Count the arguments. */ |
| int argc = 0; |
| while (argv[argc]) |
| ++argc; |
| |
| /* Construct an argument list for the shell. */ |
| { |
| gchar **new_argv; |
| |
| new_argv = g_new0 (gchar*, argc + 2); /* /bin/sh and NULL */ |
| |
| new_argv[0] = (char *) "/bin/sh"; |
| new_argv[1] = (char *) file; |
| while (argc > 0) |
| { |
| new_argv[argc + 1] = argv[argc]; |
| --argc; |
| } |
| |
| /* Execute the shell. */ |
| if (envp) |
| execve (new_argv[0], new_argv, envp); |
| else |
| execv (new_argv[0], new_argv); |
| |
| g_free (new_argv); |
| } |
| } |
| |
| static gchar* |
| my_strchrnul (const gchar *str, gchar c) |
| { |
| gchar *p = (gchar*) str; |
| while (*p && (*p != c)) |
| ++p; |
| |
| return p; |
| } |
| |
| static gint |
| g_execute (const gchar *file, |
| gchar **argv, |
| gchar **envp, |
| gboolean search_path, |
| gboolean search_path_from_envp) |
| { |
| if (*file == '\0') |
| { |
| /* We check the simple case first. */ |
| errno = ENOENT; |
| return -1; |
| } |
| |
| if (!(search_path || search_path_from_envp) || strchr (file, '/') != NULL) |
| { |
| /* Don't search when it contains a slash. */ |
| if (envp) |
| execve (file, argv, envp); |
| else |
| execv (file, argv); |
| |
| if (errno == ENOEXEC) |
| script_execute (file, argv, envp); |
| } |
| else |
| { |
| gboolean got_eacces = 0; |
| const gchar *path, *p; |
| gchar *name, *freeme; |
| gsize len; |
| gsize pathlen; |
| |
| path = NULL; |
| if (search_path_from_envp) |
| path = g_environ_getenv (envp, "PATH"); |
| if (search_path && path == NULL) |
| path = g_getenv ("PATH"); |
| |
| if (path == NULL) |
| { |
| /* There is no 'PATH' in the environment. The default |
| * search path in libc is the current directory followed by |
| * the path 'confstr' returns for '_CS_PATH'. |
| */ |
| |
| /* In GLib we put . last, for security, and don't use the |
| * unportable confstr(); UNIX98 does not actually specify |
| * what to search if PATH is unset. POSIX may, dunno. |
| */ |
| |
| path = "/bin:/usr/bin:."; |
| } |
| |
| len = strlen (file) + 1; |
| pathlen = strlen (path); |
| freeme = name = g_malloc (pathlen + len + 1); |
| |
| /* Copy the file name at the top, including '\0' */ |
| memcpy (name + pathlen + 1, file, len); |
| name = name + pathlen; |
| /* And add the slash before the filename */ |
| *name = '/'; |
| |
| p = path; |
| do |
| { |
| char *startp; |
| |
| path = p; |
| p = my_strchrnul (path, ':'); |
| |
| if (p == path) |
| /* Two adjacent colons, or a colon at the beginning or the end |
| * of 'PATH' means to search the current directory. |
| */ |
| startp = name + 1; |
| else |
| startp = memcpy (name - (p - path), path, p - path); |
| |
| /* Try to execute this name. If it works, execv will not return. */ |
| if (envp) |
| execve (startp, argv, envp); |
| else |
| execv (startp, argv); |
| |
| if (errno == ENOEXEC) |
| script_execute (startp, argv, envp); |
| |
| switch (errno) |
| { |
| case EACCES: |
| /* Record the we got a 'Permission denied' error. If we end |
| * up finding no executable we can use, we want to diagnose |
| * that we did find one but were denied access. |
| */ |
| got_eacces = TRUE; |
| |
| /* FALL THRU */ |
| |
| case ENOENT: |
| #ifdef ESTALE |
| case ESTALE: |
| #endif |
| #ifdef ENOTDIR |
| case ENOTDIR: |
| #endif |
| /* Those errors indicate the file is missing or not executable |
| * by us, in which case we want to just try the next path |
| * directory. |
| */ |
| break; |
| |
| case ENODEV: |
| case ETIMEDOUT: |
| /* Some strange filesystems like AFS return even |
| * stranger error numbers. They cannot reasonably mean anything |
| * else so ignore those, too. |
| */ |
| break; |
| |
| default: |
| /* Some other error means we found an executable file, but |
| * something went wrong executing it; return the error to our |
| * caller. |
| */ |
| g_free (freeme); |
| return -1; |
| } |
| } |
| while (*p++ != '\0'); |
| |
| /* We tried every element and none of them worked. */ |
| if (got_eacces) |
| /* At least one failure was due to permissions, so report that |
| * error. |
| */ |
| errno = EACCES; |
| |
| g_free (freeme); |
| } |
| |
| /* Return the error from the last attempt (probably ENOENT). */ |
| return -1; |
| } |
| |
| /** |
| * g_spawn_close_pid: |
| * @pid: The process reference to close |
| * |
| * On some platforms, notably Windows, the #GPid type represents a resource |
| * which must be closed to prevent resource leaking. g_spawn_close_pid() |
| * is provided for this purpose. It should be used on all platforms, even |
| * though it doesn't do anything under UNIX. |
| **/ |
| void |
| g_spawn_close_pid (GPid pid) |
| { |
| } |
