diff options
Diffstat (limited to 'libc/include/sys/wait.h')
-rw-r--r-- | libc/include/sys/wait.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/libc/include/sys/wait.h b/libc/include/sys/wait.h new file mode 100644 index 0000000..566aac7 --- /dev/null +++ b/libc/include/sys/wait.h @@ -0,0 +1,77 @@ + +#ifndef _SYS_WAIT_H +#define _SYS_WAIT_H + +#include <features.h> + +/* Bits in the third argument to `waitpid'. */ +#define WNOHANG 1 /* Don't block waiting. */ +#define WUNTRACED 2 /* Report status of stopped children. */ + +/* Everything extant so far uses these same bits. */ +/* If WIFEXITED(STATUS), the low-order 8 bits of the status. */ +#define WEXITSTATUS(status) (((status) & 0xff00) >> 8) + +/* If WIFSIGNALED(STATUS), the terminating signal. */ +#define WTERMSIG(status) ((status) & 0x7f) + +/* If WIFSTOPPED(STATUS), the signal that stopped the child. */ +#define WSTOPSIG(status) WEXITSTATUS(status) + +/* Nonzero if STATUS indicates normal termination. */ +#define WIFEXITED(status) (((status) & 0xff) == 0) + +/* Nonzero if STATUS indicates termination by a signal. */ +#define WIFSIGNALED(status) (((unsigned int)((status)-1) & 0xFFFF) < 0xFF) + +/* Nonzero if STATUS indicates the child is stopped. */ +#define WIFSTOPPED(status) (((status) & 0xff) == 0x7f) + +/* Nonzero if STATUS indicates the child dumped core. */ +#define WCOREDUMP(status) ((status) & 0200) + +/* Macros for constructing status values. */ +#define W_EXITCODE(ret, sig) ((ret) << 8 | (sig)) +#define W_STOPCODE(sig) ((sig) << 8 | 0x7f) + +/* Wait for a child to die. When one does, put its status in *STAT_LOC + and return its process ID. For errors, return (pid_t) -1. */ +extern pid_t wait __P ((__WAIT_STATUS __stat_loc)); + +/* Special values for the PID argument to `waitpid' and `wait4'. */ +#define WAIT_ANY (-1) /* Any process. */ +#define WAIT_MYPGRP 0 /* Any process in my process group. */ + +/* Wait for a child matching PID to die. + If PID is greater than 0, match any process whose process ID is PID. + If PID is (pid_t) -1, match any process. + If PID is (pid_t) 0, match any process with the + same process group as the current process. + If PID is less than -1, match any process whose + process group is the absolute value of PID. + If the WNOHANG bit is set in OPTIONS, and that child + is not already dead, return (pid_t) 0. If successful, + return PID and store the dead child's status in STAT_LOC. + Return (pid_t) -1 for errors. If the WUNTRACED bit is + set in OPTIONS, return status for stopped children; otherwise don't. */ + +extern pid_t waitpid __P ((pid_t __pid, int *__stat_loc, + int __options)); + +/* This being here makes the prototypes valid whether or not + we have already included <sys/resource.h> to define `struct rusage'. */ +struct rusage; + +/* Wait for a child to exit. When one does, put its status in *STAT_LOC and + return its process ID. For errors return (pid_t) -1. If USAGE is not + nil, store information about the child's resource usage there. If the + WUNTRACED bit is set in OPTIONS, return status for stopped children; + otherwise don't. */ +extern pid_t wait3 __P ((__WAIT_STATUS __stat_loc, + int __options, struct rusage * __usage)); + +/* PID is like waitpid. Other args are like wait3. */ +extern pid_t wait4 __P ((pid_t __pid, __WAIT_STATUS __stat_loc, + int __options, struct rusage *__usage)); + +#endif /* sys/wait.h */ |