man Pages(5): Headers, Tables and Macros

wstat(5)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

NAME

wstat- wait status

SYNOPSIS

#include <sys/wait.h>

DESCRIPTION

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.