| /* Copyright (C) 2000,2002-2004,2006,2009,2010 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library 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 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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 the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <assert.h> |
| #include <errno.h> |
| #include <sysdep-cancel.h> /* Must come before <fcntl.h>. */ |
| #include <fcntl.h> |
| #include <stdarg.h> |
| |
| #include <sys/syscall.h> |
| #include <kernel-features.h> |
| |
| #ifndef __ASSUME_FCNTL64 |
| /* This variable is shared with all files that check for fcntl64. */ |
| int __have_no_fcntl64; |
| #endif |
| |
| #ifdef __ASSUME_F_GETOWN_EX |
| # define miss_F_GETOWN_EX 0 |
| #elif !defined __ASSUME_FCNTL64 |
| static int miss_F_GETOWN_EX; |
| #endif |
| |
| |
| #if defined NO_CANCELLATION && !defined __ASSUME_FCNTL64 |
| # define __fcntl_nocancel __libc_fcntl |
| #endif |
| |
| #if !defined NO_CANCELLATION || !defined __ASSUME_FCNTL64 |
| int |
| __fcntl_nocancel (int fd, int cmd, ...) |
| { |
| va_list ap; |
| void *arg; |
| |
| va_start (ap, cmd); |
| arg = va_arg (ap, void *); |
| va_end (ap); |
| |
| #ifndef __ASSUME_FCNTL64 |
| # ifdef __NR_fcntl64 |
| if (! __have_no_fcntl64) |
| { |
| int result = INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg); |
| if (result >= 0 || errno != ENOSYS) |
| return result; |
| |
| __have_no_fcntl64 = 1; |
| } |
| # endif |
| switch (cmd) |
| { |
| case F_GETLK64: |
| /* Convert arg from flock64 to flock and back. */ |
| { |
| struct flock fl; |
| struct flock64 *fl64 = arg; |
| int res; |
| |
| fl.l_start = (off_t)fl64->l_start; |
| /* Check if we can represent the values with the smaller type. */ |
| if ((off64_t) fl.l_start != fl64->l_start) |
| { |
| eoverflow: |
| __set_errno (EOVERFLOW); |
| return -1; |
| } |
| fl.l_len = (off_t) fl64->l_len; |
| /* Check if we can represent the values with the smaller type. */ |
| if ((off64_t) fl.l_len != fl64->l_len) |
| goto eoverflow; |
| |
| fl.l_type = fl64->l_type; |
| fl.l_whence = fl64->l_whence; |
| fl.l_pid = fl64->l_pid; |
| |
| res = INLINE_SYSCALL (fcntl, 3, fd, F_GETLK, &fl); |
| if (res != 0) |
| return res; |
| /* Everything ok, convert back. */ |
| fl64->l_type = fl.l_type; |
| fl64->l_whence = fl.l_whence; |
| fl64->l_start = fl.l_start; |
| fl64->l_len = fl.l_len; |
| fl64->l_pid = fl.l_pid; |
| |
| return 0; |
| } |
| case F_SETLK64: |
| case F_SETLKW64: |
| /* Try to convert arg from flock64 to flock. */ |
| { |
| struct flock fl; |
| struct flock64 *fl64 = arg; |
| |
| fl.l_start = (off_t) fl64->l_start; |
| /* Check if we can represent the values with the smaller type. */ |
| if ((off64_t) fl.l_start != fl64->l_start) |
| goto eoverflow; |
| |
| fl.l_len = (off_t)fl64->l_len; |
| /* Check if we can represent the values with the smaller type. */ |
| if ((off64_t) fl.l_len != fl64->l_len) |
| { |
| __set_errno (EOVERFLOW); |
| return -1; |
| } |
| fl.l_type = fl64->l_type; |
| fl.l_whence = fl64->l_whence; |
| fl.l_pid = fl64->l_pid; |
| assert (F_SETLK - F_SETLKW == F_SETLK64 - F_SETLKW64); |
| return INLINE_SYSCALL (fcntl, 3, fd, cmd + F_SETLK - F_SETLK64, &fl); |
| } |
| case F_GETOWN: |
| if (! miss_F_GETOWN_EX) |
| { |
| INTERNAL_SYSCALL_DECL (err); |
| struct f_owner_ex fex; |
| int res = INTERNAL_SYSCALL (fcntl, err, 3, fd, F_GETOWN_EX, &fex); |
| if (!INTERNAL_SYSCALL_ERROR_P (res, err)) |
| return fex.type == F_OWNER_GID ? -fex.pid : fex.pid; |
| |
| # ifndef __ASSUME_F_GETOWN_EX |
| if (INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL) |
| miss_F_GETOWN_EX = 1; |
| else |
| # endif |
| { |
| __set_errno (INTERNAL_SYSCALL_ERRNO (res, err)); |
| return -1; |
| } |
| } |
| /* FALLTHROUGH */ |
| default: |
| return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg); |
| } |
| return -1; |
| #else |
| return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg); |
| #endif /* !__ASSUME_FCNTL64 */ |
| } |
| #endif /* NO_CANCELLATION || !__ASSUME_FCNTL64 */ |
| |
| |
| #ifndef __fcntl_nocancel |
| int |
| __libc_fcntl (int fd, int cmd, ...) |
| { |
| va_list ap; |
| void *arg; |
| |
| va_start (ap, cmd); |
| arg = va_arg (ap, void *); |
| va_end (ap); |
| |
| # ifdef __ASSUME_FCNTL64 |
| if (SINGLE_THREAD_P || (cmd != F_SETLKW && cmd != F_SETLKW64)) |
| return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg); |
| |
| int oldtype = LIBC_CANCEL_ASYNC (); |
| |
| int result = INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg); |
| # else |
| if (SINGLE_THREAD_P || (cmd != F_SETLKW && cmd != F_SETLKW64)) |
| return __fcntl_nocancel (fd, cmd, arg); |
| |
| int oldtype = LIBC_CANCEL_ASYNC (); |
| |
| int result = __fcntl_nocancel (fd, cmd, arg); |
| # endif |
| |
| LIBC_CANCEL_RESET (oldtype); |
| |
| return result; |
| } |
| #endif |
| libc_hidden_def (__libc_fcntl) |
| |
| weak_alias (__libc_fcntl, __fcntl) |
| libc_hidden_weak (__fcntl) |
| weak_alias (__libc_fcntl, fcntl) |