51 lines
985 B
C
51 lines
985 B
C
/* 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,fork)
|
|
_syscall3(int,_execve,const char *,file,char * const *,argv,char * const *,envp)
|
|
_syscall0(int,getpid)
|
|
_syscall2(int,setpgid,pid_t,pid,pid_t,pgid)
|
|
_syscall0(pid_t,getppid)
|
|
_syscall0(pid_t,getpgrp)
|
|
_syscall0(pid_t,setsid)
|
|
|
|
weak_alias(__libc_getpid,__getpid);
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
/* FIXME: get rid of noreturn warning */
|
|
|
|
#define return for (;;)
|
|
_syscall1(void,_exit,int,exitcode)
|
|
#undef return
|