ref: 5c96a51f3a0684765afd24930d2df7a899c22d70
dir: /sys/src/ape/lib/ap/plan9/getppid.c/
#include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include "sys9.h" pid_t getppid(void) { char buf[32]; int f; snprintf(buf, sizeof(buf), "/proc/%d/ppid", getpid()); f = open(buf, 0); if(f < 0) return 0; memset(buf, 0, sizeof(buf)); read(f, buf, sizeof(buf)-1); close(f); return atol(buf); }