content/common/set_process_title.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/common/set_process_title.h"
   6
   7 #include "build/build_config.h"
   8
   9 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_SOLARIS)
  10 #include <limits.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13
  14 #include <string>
  15
  16 #include "base/command_line.h"
  17 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_SOLARIS)
  18
  19 #if defined(OS_LINUX)
  20 #include <sys/prctl.h>
  21
  22 #include "base/file_path.h"
  23 #include "base/file_util.h"
  24 #include "base/string_util.h"
  25 // Linux/glibc doesn't natively have setproctitle().
  26 #include "content/common/set_process_title_linux.h"
  27 #endif  // defined(OS_LINUX)
  28
  29 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_SOLARIS)
  30
  31 void SetProcessTitleFromCommandLine(const char** main_argv) {
  32   // Build a single string which consists of all the arguments separated
  33   // by spaces. We can't actually keep them separate due to the way the
  34   // setproctitle() function works.
  35   std::string title;
  36   bool have_argv0 = false;
  37
  38 #if defined(OS_LINUX)
  39   if (main_argv)
  40     setproctitle_init(main_argv);
  41
  42   // In Linux we sometimes exec ourselves from /proc/self/exe, but this makes us
  43   // show up as "exe" in process listings. Read the symlink /proc/self/exe and
  44   // use the path it points at for our process title. Note that this is only for
  45   // display purposes and has no TOCTTOU security implications.
  46   FilePath target;
  47   FilePath self_exe("/proc/self/exe");
  48   if (file_util::ReadSymbolicLink(self_exe, &target)) {
  49     have_argv0 = true;
  50     title = target.value();
  51     // If the binary has since been deleted, Linux appends " (deleted)" to the
  52     // symlink target. Remove it, since this is not really part of our name.
  53     const std::string kDeletedSuffix = " (deleted)";
  54     if (EndsWith(title, kDeletedSuffix, true))
  55       title.resize(title.size() - kDeletedSuffix.size());
  56 #if defined(PR_SET_NAME)
  57     // If PR_SET_NAME is available at compile time, we try using it. We ignore
  58     // any errors if the kernel does not support it at runtime though. When
  59     // available, this lets us set the short process name that shows when the
  60     // full command line is not being displayed in most process listings.
  61     prctl(PR_SET_NAME, FilePath(title).BaseName().value().c_str());
  62 #endif  // defined(PR_SET_NAME)
  63   }
  64 #endif  // defined(OS_LINUX)
  65
  66   const CommandLine* command_line = CommandLine::ForCurrentProcess();
  67   for (size_t i = 1; i < command_line->argv().size(); ++i) {
  68     if (!title.empty())
  69       title += " ";
  70     title += command_line->argv()[i];
  71   }
  72   // Disable prepending argv[0] with '-' if we prepended it ourselves above.
  73   setproctitle(have_argv0 ? "-%s" : "%s", title.c_str());
  74 }
  75
  76 #else
  77
  78 // All other systems (basically Windows & Mac) have no need or way to implement
  79 // this function.
  80 void SetProcessTitleFromCommandLine(const char** /* main_argv */) {
  81 }
  82
  83 #endif