ref: 1ccd0cd04d75840861e26f6c5f6ac73396d43d8a
dir: /sys/src/ape/lib/ap/plan9/getpgrp.c/
#include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <stdio.h> #include "sys9.h" #include "lib.h" pid_t getpgrp(void) { int n, f, pid; char pgrpbuf[15], fname[30]; pid = getpid(); sprintf(fname, "/proc/%d/noteid", pid); f = open(fname, 0); n = read(f, pgrpbuf, sizeof pgrpbuf); if(n < 0) _syserrno(); else n = atoi(pgrpbuf); close(f); return n; }