3 * Copyright 2004--2009, Google Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include <sys/types.h>
34 #include "talk/base/linuxfdwalk.h"
36 // Parses a file descriptor number in base 10, requiring the strict format used
37 // in /proc/*/fd. Returns the value, or -1 if not a valid string.
38 static int parse_fd(const char *s) {
40 // Empty string is invalid.
45 if (*s < '0' || *s > '9') {
46 // Non-numeric characters anywhere are invalid.
49 int digit = *s++ - '0';
50 val = val * 10 + digit;
55 int fdwalk(void (*func)(void *, int), void *opaque) {
56 DIR *dir = opendir("/proc/self/fd");
60 int opendirfd = dirfd(dir);
63 // Have to clear errno to distinguish readdir() completion from failure.
64 while (errno = 0, (ent = readdir(dir)) != NULL) {
65 if (strcmp(ent->d_name, ".") == 0 ||
66 strcmp(ent->d_name, "..") == 0) {
69 // We avoid atoi or strtol because those are part of libc and they involve
70 // locale stuff, which is probably not safe from a post-fork context in a
71 // multi-threaded app.
72 int fd = parse_fd(ent->d_name);
77 if (fd != opendirfd) {
81 int saved_errno = errno;
82 if (closedir(dir) < 0) {
84 // Return the closedir error.
87 // Else ignore it because we have a more relevant error to return.
92 } else if (parse_errors) {