wait.h(3head) [linux man page]
<sys/wait.h>(P) POSIX Programmer's Manual <sys/wait.h>(P) NAME
sys/wait.h - declarations for waiting SYNOPSIS
#include <sys/wait.h> DESCRIPTION
The <sys/wait.h> header shall define the following symbolic constants for use with waitpid(): WNOHANG Do not hang if no status is available; return immediately. WUNTRACED Report status of stopped child process. The <sys/wait.h> header shall define the following macros for analysis of process status values: WEXITSTATUS Return exit status. WIFCONTINUED True if child has been continued. WIFEXITED True if child exited normally. WIFSIGNALED True if child exited due to uncaught signal. WIFSTOPPED True if child is currently stopped. WSTOPSIG Return signal number that caused process to stop. WTERMSIG Return signal number that caused process to terminate. The following symbolic constants shall be defined as possible values for the options argument to waitid(): 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 shall be defined as an enumeration type whose possible values shall include at least the following: P_ALL P_PID P_PGID The id_t and pid_t types shall be defined as described in <sys/types.h> . The siginfo_t type shall be defined as described in <signal.h> . The rusage structure shall be defined as described in <sys/resource.h> . Inclusion of the <sys/wait.h> header may also make visible all symbols from <signal.h> and <sys/resource.h>. The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided. pid_t wait(int *); int waitid(idtype_t, id_t, siginfo_t *, int); pid_t waitpid(pid_t, int *, int); The following sections are informative. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
<signal.h> , <sys/resource.h> , <sys/types.h> , the System Interfaces volume of IEEE Std 1003.1-2001, wait(), waitid() COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 <sys/wait.h>(P)
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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 evaluate 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 signal. 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 immediately. 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 values 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 ALSO
exit(2), waitid(2), exit(3C), wait(3C), waitpid(3C),attributes(5), standards(5) SunOS 5.10 10 Sep 2004 wait.h(3HEAD)