Remove unused files linux.cc/.h and linuxfdwalk.c/.h.

webrtc/base/linuxfdwalk.c

-/*
- *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include <sys/types.h>
-#include <dirent.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "webrtc/base/linuxfdwalk.h"
-
-// Parses a file descriptor number in base 10, requiring the strict format used
-// in /proc/*/fd. Returns the value, or -1 if not a valid string.
-static int parse_fd(const char *s) {
-  if (!*s) {
-    // Empty string is invalid.
-    return -1;
-  }
-  int val = 0;
-  do {
-    if (*s < '0' || *s > '9') {
-      // Non-numeric characters anywhere are invalid.
-      return -1;
-    }
-    int digit = *s++ - '0';
-    val = val * 10 + digit;
-  } while (*s);
-  return val;
-}
-
-int fdwalk(void (*func)(void *, int), void *opaque) {
-  DIR *dir = opendir("/proc/self/fd");
-  if (!dir) {
-    return -1;
-  }
-  int opendirfd = dirfd(dir);
-  int parse_errors = 0;
-  struct dirent *ent;
-  // Have to clear errno to distinguish readdir() completion from failure.
-  while (errno = 0, (ent = readdir(dir)) != NULL) {
-    if (strcmp(ent->d_name, ".") == 0 ||
-        strcmp(ent->d_name, "..") == 0) {
-      continue;
-    }
-    // We avoid atoi or strtol because those are part of libc and they involve
-    // locale stuff, which is probably not safe from a post-fork context in a
-    // multi-threaded app.
-    int fd = parse_fd(ent->d_name);
-    if (fd < 0) {
-      parse_errors = 1;
-      continue;
-    }
-    if (fd != opendirfd) {
-      (*func)(opaque, fd);
-    }
-  }
-  int saved_errno = errno;
-  if (closedir(dir) < 0) {
-    if (!saved_errno) {
-      // Return the closedir error.
-      return -1;
-    }
-    // Else ignore it because we have a more relevant error to return.
-  }
-  if (saved_errno) {
-    errno = saved_errno;
-    return -1;
-  } else if (parse_errors) {
-    errno = EBADF;
-    return -1;
-  } else {
-    return 0;
-  }
-}