minix/lib/nbsd_libc/sys-minix/getppid.c

23 lines
536 B
C
Raw Normal View History

#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <unistd.h>
#ifdef __weak_alias
__weak_alias(getppid, _getppid)
#endif
PUBLIC pid_t getppid()
{
message m;
/* POSIX says that this function is always successful and that no
* return value is reserved to indicate an error. Minix syscalls
* are not always successful and Minix returns the reserved value
* (pid_t) -1 when there is an error.
*/
if (_syscall(PM_PROC_NR, MINIX_GETPID, &m) < 0) return ( (pid_t) -1);
return( (pid_t) m.m2_i1);
}