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When a process waits for status from its children via either the wait or waitpid function, the status returned may be evaluated with the following macros, defined
in <sys/wait.h>. These macros evaluate to integral expressions. The stat argument to these macros is the integer value returned from wait
or waitpid.
-
WIFEXITED(stat)
- Evaluates to a non-zero value if status
was returned for a child process that terminated normally.
-
WEXITSTATUS(stat)
- If the value of WIFEXITED(stat) is non-zero, this macro evaluates to the exit code that the child process passed to _exit() (see exit(2)) or exit(3C),
or the value that the child process returned from main.
-
WIFSIGNALED(stat)
- Evaluates to a non-zero value if status was returned for a child process that
terminated due to the receipt of a signal.
-
WTERMSIG(stat)
- If the value of WIFSIGNALED(stat) is non-zero, this
macro evaluates to the number of the signal that caused the termination of the child process.
-
WIFSTOPPED(stat)
- Evaluates to a non-zero value if status was returned for a child process that
is currently stopped.
-
WSTOPSIG(stat)
- If the value of WIFSTOPPED(stat) is non-zero, this macro evaluates to the number of the signal that caused the child process to stop.
-
WIFCONTINUED(stat)
- Evaluates to a non-zero value if status was returned for a child process that has continued.
-
WCOREDUMP(stat)
- If the value of WIFSIGNALED (stat) is non-zero, this
macro evaluates to a non-zero value if a core image of the terminated child was created.
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