minix3/lib/libc/sys/getppid.c

21 lines
519 B
C

#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <string.h>
#include <unistd.h>
pid_t getppid(void)
{
message m;
memset(&m, 0, sizeof(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, PM_GETPID, &m) < 0) return(-1);
return(m.m_pm_lc_getpid.parent_pid);
}