DataMuseum.dk

top - download

    Length: 2685 (0xa7d)
    Types: TextFile
    Notes: @(#)wait.h 13.2 (RC International) 91/03/04 */
    Names: »wait.h«

└─⟦50656ff4a⟧ Bits:30010538 TX 3.1 Coldstart
    └─⟦bbf173f5c⟧ »0004« 
        └─⟦this⟧ »./bsd/usr/include/sys/wait.h« 

TextFile

/*	@(#)wait.h	13.2 (RC International) 91/03/04	*/


#ifndef _WAIT_H
#define _WAIT_H

/*
 * 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_dummy1:16;    /* 2 dummy byte for big ending*/
		unsigned short	w_Retcode:8;	/* sig code if w_termsig!=0 */
						/* or high byte of exit arg */
		unsigned short	w_Coredump:1;	/* core dump indicator */
		unsigned short	w_Termsig:7;	/* termination signal */
	} w_T;
	/*
	 * Stopped process status.  Returned
	 * only for traced children unless requested
	 * with the WUNTRACED option bit.
	 */
	struct {
		unsigned short  w_dummy2:16;    /* 2 dummy byte for big ending*/
		unsigned short	w_Stopsig:8;	/* signal that stopped us */
		unsigned short	w_Stopval:8;	/* == WSTOPPED if stopped */
	} w_S;
	/*
	 * exit value for wait
	 */
	struct {
		unsigned short  w_dummy2:16;    /* 2 dummy byte for big ending*/
		unsigned short	w_Exitval:16	/* exit value for wait */
	} w_U;
};

#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 w_xstat		w_U.w_Exitval

/*
 * Option bits for argument of wait3 and waitpid.  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	WSTOPPED	0177	/* value of s.stopval if process is stopped */

#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)

#endif /* _WAIT_H */