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

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#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 ( (pid_t) -1);
return( (pid_t) m.PM_GETPID_PARENT);
}