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      1 // Copyright (c) 2012 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/files/file_path.h"
     23 #include "base/files/file_util.h"
     24 #include "base/process/process_metrics.h"
     25 #include "base/strings/string_util.h"
     26 #include "base/threading/platform_thread.h"
     27 // Linux/glibc doesn't natively have setproctitle().
     28 #include "content/common/set_process_title_linux.h"
     29 #endif  // defined(OS_LINUX)
     30 
     31 namespace content {
     32 
     33 // TODO(jrg): Find out if setproctitle or equivalent is available on Android.
     34 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_SOLARIS) && \
     35   !defined(OS_ANDROID)
     36 
     37 void SetProcessTitleFromCommandLine(const char** main_argv) {
     38   // Build a single string which consists of all the arguments separated
     39   // by spaces. We can't actually keep them separate due to the way the
     40   // setproctitle() function works.
     41   std::string title;
     42   bool have_argv0 = false;
     43 
     44 #if defined(OS_LINUX)
     45   DCHECK_EQ(base::PlatformThread::CurrentId(), getpid());
     46 
     47   if (main_argv)
     48     setproctitle_init(main_argv);
     49 
     50   // In Linux we sometimes exec ourselves from /proc/self/exe, but this makes us
     51   // show up as "exe" in process listings. Read the symlink /proc/self/exe and
     52   // use the path it points at for our process title. Note that this is only for
     53   // display purposes and has no TOCTTOU security implications.
     54   base::FilePath target;
     55   base::FilePath self_exe(base::kProcSelfExe);
     56   if (base::ReadSymbolicLink(self_exe, &target)) {
     57     have_argv0 = true;
     58     title = target.value();
     59     // If the binary has since been deleted, Linux appends " (deleted)" to the
     60     // symlink target. Remove it, since this is not really part of our name.
     61     const std::string kDeletedSuffix = " (deleted)";
     62     if (EndsWith(title, kDeletedSuffix, true))
     63       title.resize(title.size() - kDeletedSuffix.size());
     64 
     65     // PR_SET_NAME is available in Linux 2.6.9 and newer.
     66     // When available at run time, this sets the short process name that shows
     67     // when the full command line is not being displayed in most process
     68     // listings.
     69     prctl(PR_SET_NAME, base::FilePath(title).BaseName().value().c_str());
     70   }
     71 #endif  // defined(OS_LINUX)
     72 
     73   const CommandLine* command_line = CommandLine::ForCurrentProcess();
     74   for (size_t i = 1; i < command_line->argv().size(); ++i) {
     75     if (!title.empty())
     76       title += " ";
     77     title += command_line->argv()[i];
     78   }
     79   // Disable prepending argv[0] with '-' if we prepended it ourselves above.
     80   setproctitle(have_argv0 ? "-%s" : "%s", title.c_str());
     81 }
     82 
     83 #else
     84 
     85 // All other systems (basically Windows & Mac) have no need or way to implement
     86 // this function.
     87 void SetProcessTitleFromCommandLine(const char** /* main_argv */) {
     88 }
     89 
     90 #endif
     91 
     92 } // namespace content
     93