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| <h3 class="section">26.7 Process Completion Status</h3> |
| |
| <p>If the exit status value (see <a href="Program-Termination.html#Program-Termination">Program Termination</a>) of the child |
| process is zero, then the status value reported by <code>waitpid</code> or |
| <code>wait</code> is also zero. You can test for other kinds of information |
| encoded in the returned status value using the following macros. |
| These macros are defined in the header file <samp><span class="file">sys/wait.h</span></samp>. |
| <a name="index-sys_002fwait_002eh-3185"></a> |
| <!-- sys/wait.h --> |
| <!-- POSIX.1 --> |
| |
| <div class="defun"> |
| — Macro: int <b>WIFEXITED</b> (<var>int status</var>)<var><a name="index-WIFEXITED-3186"></a></var><br> |
| <blockquote><p>This macro returns a nonzero value if the child process terminated |
| normally with <code>exit</code> or <code>_exit</code>. |
| </p></blockquote></div> |
| |
| <!-- sys/wait.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>WEXITSTATUS</b> (<var>int status</var>)<var><a name="index-WEXITSTATUS-3187"></a></var><br> |
| <blockquote><p>If <code>WIFEXITED</code> is true of <var>status</var>, this macro returns the |
| low-order 8 bits of the exit status value from the child process. |
| See <a href="Exit-Status.html#Exit-Status">Exit Status</a>. |
| </p></blockquote></div> |
| |
| <!-- sys/wait.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>WIFSIGNALED</b> (<var>int status</var>)<var><a name="index-WIFSIGNALED-3188"></a></var><br> |
| <blockquote><p>This macro returns a nonzero value if the child process terminated |
| because it received a signal that was not handled. |
| See <a href="Signal-Handling.html#Signal-Handling">Signal Handling</a>. |
| </p></blockquote></div> |
| |
| <!-- sys/wait.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>WTERMSIG</b> (<var>int status</var>)<var><a name="index-WTERMSIG-3189"></a></var><br> |
| <blockquote><p>If <code>WIFSIGNALED</code> is true of <var>status</var>, this macro returns the |
| signal number of the signal that terminated the child process. |
| </p></blockquote></div> |
| |
| <!-- sys/wait.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>WCOREDUMP</b> (<var>int status</var>)<var><a name="index-WCOREDUMP-3190"></a></var><br> |
| <blockquote><p>This macro returns a nonzero value if the child process terminated |
| and produced a core dump. |
| </p></blockquote></div> |
| |
| <!-- sys/wait.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>WIFSTOPPED</b> (<var>int status</var>)<var><a name="index-WIFSTOPPED-3191"></a></var><br> |
| <blockquote><p>This macro returns a nonzero value if the child process is stopped. |
| </p></blockquote></div> |
| |
| <!-- sys/wait.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>WSTOPSIG</b> (<var>int status</var>)<var><a name="index-WSTOPSIG-3192"></a></var><br> |
| <blockquote><p>If <code>WIFSTOPPED</code> is true of <var>status</var>, this macro returns the |
| signal number of the signal that caused the child process to stop. |
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