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- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- *
- * @(#)wait.h 7.4 (Berkeley) 1/27/88
- */
-
- #ifndef _WAIT
- #define _WAIT
-
- /*
- * 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>).
- */
-
- #include <machine/machparam.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 {
- #if BYTE_ORDER == LITTLE_ENDIAN
- unsigned int w_Termsig:7; /* termination signal */
- unsigned int w_Coredump:1; /* core dump indicator */
- unsigned int w_Retcode:8; /* exit code if w_termsig==0 */
- #endif
- #if BYTE_ORDER == BIG_ENDIAN
- unsigned short w_Filler; /* upper bits filler */
- unsigned char w_Retcode; /* exit code if w_termsig==0 */
- unsigned int w_Coredump:1; /* core dump indicator */
- unsigned int w_Termsig:7; /* termination signal */
- #endif
- } w_T;
- /*
- * Stopped process status. Returned
- * only for traced children unless requested
- * with the WUNTRACED option bit.
- */
- struct {
- #if BYTE_ORDER == LITTLE_ENDIAN
- unsigned int w_Stopval:8; /* == W_STOPPED if stopped */
- unsigned int w_Stopsig:8; /* signal that stopped us */
- #else
- unsigned short w_Filler; /* upper bits filler */
- unsigned char w_Stopsig; /* signal that stopped us */
- unsigned char w_Stopval; /* == W_STOPPED if stopped */
- #endif
- } 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) (((union wait *) &(x))->w_stopval == WSTOPPED)
- #define WIFSIGNALED(x) (((union wait *) &(x))->w_stopval != WSTOPPED && \
- ((union wait *) &(x))->w_termsig != 0)
- #define WIFEXITED(x) (((union wait *) &(x))->w_stopval != WSTOPPED && \
- ((union wait *) &(x))->w_termsig == 0)
- #define WEXITSTATUS(x) (((union wait *) &(x))->w_retcode)
- #define WTERMSIG(x) (((union wait *) &(x))->w_termsig)
- #define WSTOPSIG(x) (((union wait *) &(x))->w_stopsig)
-
- extern int wait();
- extern int wait3();
-
- #endif /* _WAIT */
-