41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* 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
|
|
#include <minix/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) & 0xFFFFU) < 0xFFU) /* signaled */
|
|
#define WIFSTOPPED(s) (_LOW(s) == 0177) /* stopped */
|
|
#define WSTOPSIG(s) (_HIGH(s) & 0377) /* stop signal */
|
|
|
|
/* Function Prototypes. */
|
|
_PROTOTYPE( pid_t wait, (int *_stat_loc) );
|
|
_PROTOTYPE( pid_t waitpid, (pid_t _pid, int *_stat_loc, int _options) );
|
|
|
|
#endif /* _WAIT_H */
|