mi.wait.h revision 316958 
1/* The <sys/wait.h> header contains macros related to wait(). The value
2 * returned by wait() and waitpid() depends on whether the process
3 * terminated by an exit() call, was killed by a signal, or was stopped
4 * due to job control, as follows:
5 *
6 *				 High byte   Low byte
7 *				+---------------------+
8 *	exit(status)		|  status  |    0     |
9 *				+---------------------+
10 *      killed by signal	|    0     |  signal  |
11 *				+---------------------+
12 *	stopped (job control)	|  signal  |   0177   |
13 *				+---------------------+
14 */
15
16#ifndef _WAIT_H
17#define _WAIT_H
18
19#ifndef _TYPES_H		/* not quite right */
20#include <sys/types.h>
21#endif
22
23#define __LOW(v)	((v) & 0377)
24#define __HIGH(v)	(((v) >> 8) & 0377)
25
26#define WNOHANG         1	/* do not wait for child to exit */
27#define WUNTRACED       2	/* for job control; not implemented */
28
29#define WIFEXITED(s)	(__LOW(s) == 0)		    /* normal exit */
30#define WEXITSTATUS(s)	(__HIGH(s))			    /* exit status */
31#define WTERMSIG(s)	(__LOW(s) & 0177)		    /* sig value */
32#define WIFSIGNALED(s)	((((unsigned int)(s)-1) & 0xFFFF) < 0xFF) /* signaled */
33#define WIFSTOPPED(s)	(__LOW(s) == 0177)		    /* stopped */
34#define WSTOPSIG(s)	(__HIGH(s) & 0377)		    /* stop signal */
35
36/* Function Prototypes. */
37#ifndef _ANSI_H
38#include <ansi.h>
39#endif
40
41_PROTOTYPE( pid_t wait, (int *_stat_loc)			   	   );
42_PROTOTYPE( pid_t waitpid, (pid_t _pid, int *_stat_loc, int _options)	   );
43
44#endif /* _WAIT_H */
45