proc.c revision f13505251e6402460f6cc7ec84e0d8ca91607b4f 
1#if HAVE_CONFIG_H
2#include "config.h"
3#endif
4
5#include <sys/types.h>
6#include <stdio.h>
7#include <string.h>
8#include <signal.h>
9#include <unistd.h>
10
11/* /proc/pid doesn't exist just after the fork, and sometimes `ltrace'
12 * couldn't open it to find the executable.  So it may be necessary to
13 * have a bit delay
14 */
15
16#define	MAX_DELAY	100000	/* 100000 microseconds = 0.1 seconds */
17
18/*
19 * Returns a file name corresponding to a running pid
20 */
21char *
22pid2name(pid_t pid) {
23	char proc_exe[1024];
24
25	if (!kill(pid, 0)) {
26		int delay = 0;
27
28		sprintf(proc_exe, "/proc/%d/exe", pid);
29
30		while (delay < MAX_DELAY) {
31			if (!access(proc_exe, F_OK)) {
32				return strdup(proc_exe);
33			}
34			delay += 1000;	/* 1 milisecond */
35		}
36	}
37	return NULL;
38}
39