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/* 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