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59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
/* libc/sys/linux/process.c - Process-related system calls */
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/* Written 2000 by Werner Almesberger */
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#include <sys/unistd.h>
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#include <sys/wait.h>
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#include <machine/syscall.h>
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#define __NR__exit __NR_exit
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#define __NR__execve __NR_execve
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_syscall0(int,getpid)
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_syscall0(pid_t,getppid)
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weak_alias(__libc_getpid,__getpid);
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#if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 3
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_syscall3(int,_execve,const char *,file,char * const *,argv,char * const *,envp)
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_syscall0(int,fork)
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#endif /* _ELIX_LEVEL >= 3 */
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#if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 4
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_syscall0(pid_t,getpgrp)
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_syscall2(int,setpgid,pid_t,pid,pid_t,pgid)
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_syscall0(pid_t,setsid)
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/* Here we implement vfork in terms of fork, since
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* Linux's vfork system call is not reliable.
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*/
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pid_t vfork(void)
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{
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pid_t pid;
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pid = fork();
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if(!pid)
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{
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/* In child. */
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return 0;
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}
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else
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{
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/* In parent. Wait for child to finish. */
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if (waitpid (pid, NULL, 0) < 0)
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return pid;
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}
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}
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#endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 4 */
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/* Although _exit is listed as level 3, we use it from level 1 interfaces */
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/* FIXME: get rid of noreturn warning */
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#define return for (;;)
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_syscall1(void,_exit,int,exitcode)
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#undef return
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