wait.h(3HEAD) Headers wait.h(3HEAD)NAME
wait.h, wait - wait status
SYNOPSIS
#include <sys/wait.h>
DESCRIPTION
When a process waits for status from its children using either the
wait(3C) or waitpid(3C) function, the status returned can be evaluated
with the following macros, defined in <sys/wait.h>. These macros evalu‐
ate to integral expressions. The stat argument to these macros is the
integer value returned from wait() or waitpid().
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.
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.
WIFCONTINUED(stat) Evaluates to a non-zero value if status
was returned for a child process that
has continued.
WIFEXITED(stat) Evaluates to a non-zero value if status
was returned for a child process that
terminated normally.
WIFSIGNALED(stat) Evaluates to a non-zero value if status
was returned for a child process that
terminated due to the receipt of a sig‐
nal.
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.
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.
The <sys/wait.h> header defines the symbolic constants listed below for
use with waitpid(3C).
WNOHANG Do not hang if no status is available; return immedi‐
ately.
WUNTRACED Report status of stopped child process.
The symbolic constants listed below are defined as possible values for
the options argument to waitid(2).
WEXITED Wait for processes that have exited.
WSTOPPED Status is returned for any child that has stopped upon
receipt of a signal.
WCONTINUED Status is returned for any child that was stopped and
has been continued.
WNOHANG Return immediately if there are no children to wait
for.
WNOWAIT Keep the process whose status is returned in infop in a
waitable state.
The type idtype_t is defined as an enumeration type whose possible val‐
ues include the following:
P_ALL
P_PID
P_PGID
The id_t and pid_t types are defined as described in <sys/types.h>.
The siginfo_t type is defined as described in <signal.h>.
The rusage structure is defined as described in <sys/resource.h>.
Inclusion of the <sys/wait.h> header can also make visible all symbols
from <signal.h> and <sys/resource.h>.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOexit(2), waitid(2), exit(3C), wait(3C), waitpid(3C),attributes(5),
standards(5)SunOS 5.10 10 Sep 2004 wait.h(3HEAD)
