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