minix/lib/posix/_getppid.c

16 lines
446 B
C
Executable file

#include <lib.h>
#define getppid _getppid
#include <unistd.h>
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(MM, MINIX_GETPID, &m) < 0) return ( (pid_t) -1);
return( (pid_t) m.m2_i1);
}