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Length: 2294 (0x8f6)
Types: TextFile
Notes: UNIX file
Names: »wait.h«
└─⟦26887b7e0⟧ Bits:30009717 Comet 32 harddisk image
└─⟦28c352965⟧ »/a« UNIX Filesystem
└─⟦this⟧ »usr/include/sys/wait.h«
└─⟦this⟧ »usr/include/wait.h«
/*
* @(#)wait.h 1.2 7/13/83
* @(#)Copyright (C) 1983 by National Semiconductor Corp.
*/
/*
* This file holds definitions relevent to the wait system call.
* Some of the options here are available only through the ``wait3''
* entry point; the old entry point with one argument has more fixed
* semantics, never returning status of unstopped children, hanging until
* a process terminates if any are outstanding, and never returns
* detailed information about process resource utilization (<vtimes.h>).
*/
/*
* Structure of the information in the first word returned by both
* wait and wait3. If w_stopval==WSTOPPED, then the second structure
* describes the information returned, else the first. See WUNTRACED below.
*/
union wait {
int w_status; /* used in syscall */
/*
* Terminated process status.
*/
struct {
unsigned short w_Termsig:7; /* termination signal */
unsigned short w_Coredump:1; /* core dump indicator */
unsigned short w_Retcode:8; /* exit code if w_termsig==0 */
} w_T;
/*
* Stopped process status. Returned
* only for traced children unless requested
* with the WUNTRACED option bit.
*/
struct {
unsigned short w_Stopval:8; /* == W_STOPPED if stopped */
unsigned short w_Stopsig:8; /* signal that stopped us */
} w_S;
};
#define w_termsig w_T.w_Termsig
#define w_coredump w_T.w_Coredump
#define w_retcode w_T.w_Retcode
#define w_stopval w_S.w_Stopval
#define w_stopsig w_S.w_Stopsig
#define WSTOPPED 0177 /* value of s.stopval if process is stopped */
/*
* Option bits for the second argument of wait3. WNOHANG causes the
* wait to not hang if there are no stopped or terminated processes, rather
* returning an error indication in this case (pid==0). WUNTRACED
* indicates that the caller should receive status about untraced children
* which stop due to signals. If children are stopped and a wait without
* this option is done, it is as though they were still running... nothing
* about them is returned.
*/
#define WNOHANG 1 /* dont hang in wait */
#define WUNTRACED 2 /* tell about stopped, untraced children */
#define WIFSTOPPED(x) ((x).w_stopval == WSTOPPED)
#define WIFSIGNALED(x) ((x).w_stopval != WSTOPPED && (x).w_termsig != 0)
#define WIFEXITED(x) ((x).w_stopval != WSTOPPED && (x).w_termsig == 0)