1 /* libc/sys/linux/process.c - Process-related system calls */
2
3 /* Written 2000 by Werner Almesberger */
4
5
6 #include <sys/unistd.h>
7 #include <sys/wait.h>
8 #include <machine/syscall.h>
9
10
11 #define __NR__exit __NR_exit
12 #define __NR__execve __NR_execve
13
14 _syscall0(int,getpid)
15 _syscall0(pid_t,getppid)
16
17 weak_alias(__libc_getpid,__getpid);
18
19 #if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 3
_syscall3(int,_execve,const char *,file,char * const *,argv,char * const *,envp)20 _syscall3(int,_execve,const char *,file,char * const *,argv,char * const *,envp)
21 _syscall0(int,fork)
22 #endif /* _ELIX_LEVEL >= 3 */
23
24 #if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 4
25 _syscall0(pid_t,getpgrp)
26 _syscall2(int,setpgid,pid_t,pid,pid_t,pgid)
27 _syscall0(pid_t,setsid)
28
29 /* Here we implement vfork in terms of fork, since
30 * Linux's vfork system call is not reliable.
31 */
32 pid_t vfork(void)
33 {
34 pid_t pid;
35
36 pid = fork();
37
38 if(!pid)
39 {
40 /* In child. */
41 return 0;
42 }
43 else
44 {
45 /* In parent. Wait for child to finish. */
46 if (waitpid (pid, NULL, 0) < 0)
47 return pid;
48 }
49 }
50 #endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 4 */
51
52
53 /* Although _exit is listed as level 3, we use it from level 1 interfaces */
54 /* FIXME: get rid of noreturn warning */
55
56 #define return for (;;)
57 _syscall1(void,_exit,int,exitcode)
58 #undef return
59