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mi.wait.h

/* The <sys/wait.h> header contains macros related to wait(). The value
 * returned by wait() and waitpid() depends on whether the process 
 * terminated by an exit() call, was killed by a signal, or was stopped
 * due to job control, as follows:
 *
 *                       High byte   Low byte
 *                      +---------------------+
 *    exit(status)            |  status  |    0     |
 *                      +---------------------+
 *      killed by signal      |    0     |  signal  |
 *                      +---------------------+
 *    stopped (job control)   |  signal  |   0177   |
 *                      +---------------------+
 */

#ifndef _WAIT_H
#define _WAIT_H

#ifndef _TYPES_H        /* not quite right */
#include <sys/types.h>
#endif

#define __LOW(v)  ((v) & 0377)
#define __HIGH(v) (((v) >> 8) & 0377)

#define WNOHANG         1     /* do not wait for child to exit */
#define WUNTRACED       2     /* for job control; not implemented */

#define WIFEXITED(s)    (__LOW(s) == 0)             /* normal exit */
#define WEXITSTATUS(s)  (__HIGH(s))                 /* exit status */
#define WTERMSIG(s)     (__LOW(s) & 0177)           /* sig value */
#define WIFSIGNALED(s)  ((((unsigned int)(s)-1) & 0xFFFF) < 0xFF) /* signaled */
#define WIFSTOPPED(s)   (__LOW(s) == 0177)                /* stopped */
#define WSTOPSIG(s)     (__HIGH(s) & 0377)                /* stop signal */

/* Function Prototypes. */
#ifndef _ANSI_H
#include <ansi.h>
#endif

_PROTOTYPE( pid_t wait, (int *_stat_loc)                       );
_PROTOTYPE( pid_t waitpid, (pid_t _pid, int *_stat_loc, int _options)      );

#endif /* _WAIT_H */

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