1 // Copyright (c) 2013 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 // This file contains routines to kill processes and get the exit code and 6 // termination status. 7 8 #ifndef BASE_PROCESS_KILL_H_ 9 #define BASE_PROCESS_KILL_H_ 10 11 #include "base/files/file_path.h" 12 #include "base/process/process.h" 13 #include "base/process/process_handle.h" 14 #include "base/time/time.h" 15 #include "build/build_config.h" 16 17 namespace base { 18 19 class ProcessFilter; 20 21 // Return status values from GetTerminationStatus. Don't use these as 22 // exit code arguments to KillProcess*(), use platform/application 23 // specific values instead. 24 enum TerminationStatus { 25 TERMINATION_STATUS_NORMAL_TERMINATION, // zero exit status 26 TERMINATION_STATUS_ABNORMAL_TERMINATION, // non-zero exit status 27 TERMINATION_STATUS_PROCESS_WAS_KILLED, // e.g. SIGKILL or task manager kill 28 TERMINATION_STATUS_PROCESS_CRASHED, // e.g. Segmentation fault 29 TERMINATION_STATUS_STILL_RUNNING, // child hasn't exited yet 30 #if defined(OS_CHROMEOS) 31 // Used for the case when oom-killer kills a process on ChromeOS. 32 TERMINATION_STATUS_PROCESS_WAS_KILLED_BY_OOM, 33 #endif 34 #if defined(OS_ANDROID) 35 // On Android processes are spawned from the system Zygote and we do not get 36 // the termination status. We can't know if the termination was a crash or an 37 // oom kill for sure, but we can use status of the strong process bindings as 38 // a hint. 39 TERMINATION_STATUS_OOM_PROTECTED, // child was protected from oom kill 40 #endif 41 TERMINATION_STATUS_LAUNCH_FAILED, // child process never launched 42 TERMINATION_STATUS_MAX_ENUM 43 }; 44 45 // Attempts to kill all the processes on the current machine that were launched 46 // from the given executable name, ending them with the given exit code. If 47 // filter is non-null, then only processes selected by the filter are killed. 48 // Returns true if all processes were able to be killed off, false if at least 49 // one couldn't be killed. 50 BASE_EXPORT bool KillProcesses(const FilePath::StringType& executable_name, 51 int exit_code, 52 const ProcessFilter* filter); 53 54 #if defined(OS_POSIX) 55 // Attempts to kill the process group identified by |process_group_id|. Returns 56 // true on success. 57 BASE_EXPORT bool KillProcessGroup(ProcessHandle process_group_id); 58 #endif // defined(OS_POSIX) 59 60 // Get the termination status of the process by interpreting the 61 // circumstances of the child process' death. |exit_code| is set to 62 // the status returned by waitpid() on POSIX, and from 63 // GetExitCodeProcess() on Windows. |exit_code| may be NULL if the 64 // caller is not interested in it. Note that on Linux, this function 65 // will only return a useful result the first time it is called after 66 // the child exits (because it will reap the child and the information 67 // will no longer be available). 68 BASE_EXPORT TerminationStatus GetTerminationStatus(ProcessHandle handle, 69 int* exit_code); 70 71 #if defined(OS_POSIX) 72 // Send a kill signal to the process and then wait for the process to exit 73 // and get the termination status. 74 // 75 // This is used in situations where it is believed that the process is dead 76 // or dying (because communication with the child process has been cut). 77 // In order to avoid erroneously returning that the process is still running 78 // because the kernel is still cleaning it up, this will wait for the process 79 // to terminate. In order to avoid the risk of hanging while waiting for the 80 // process to terminate, send a SIGKILL to the process before waiting for the 81 // termination status. 82 // 83 // Note that it is not an option to call WaitForExitCode and then 84 // GetTerminationStatus as the child will be reaped when WaitForExitCode 85 // returns, and this information will be lost. 86 // 87 BASE_EXPORT TerminationStatus GetKnownDeadTerminationStatus( 88 ProcessHandle handle, int* exit_code); 89 #endif // defined(OS_POSIX) 90 91 // Wait for all the processes based on the named executable to exit. If filter 92 // is non-null, then only processes selected by the filter are waited on. 93 // Returns after all processes have exited or wait_milliseconds have expired. 94 // Returns true if all the processes exited, false otherwise. 95 BASE_EXPORT bool WaitForProcessesToExit( 96 const FilePath::StringType& executable_name, 97 base::TimeDelta wait, 98 const ProcessFilter* filter); 99 100 // Waits a certain amount of time (can be 0) for all the processes with a given 101 // executable name to exit, then kills off any of them that are still around. 102 // If filter is non-null, then only processes selected by the filter are waited 103 // on. Killed processes are ended with the given exit code. Returns false if 104 // any processes needed to be killed, true if they all exited cleanly within 105 // the wait_milliseconds delay. 106 BASE_EXPORT bool CleanupProcesses(const FilePath::StringType& executable_name, 107 base::TimeDelta wait, 108 int exit_code, 109 const ProcessFilter* filter); 110 111 // This method ensures that the specified process eventually terminates, and 112 // then it closes the given process handle. 113 // 114 // It assumes that the process has already been signalled to exit, and it 115 // begins by waiting a small amount of time for it to exit. If the process 116 // does not appear to have exited, then this function starts to become 117 // aggressive about ensuring that the process terminates. 118 // 119 // On Linux this method does not block the calling thread. 120 // On OS X this method may block for up to 2 seconds. 121 // 122 // NOTE: The process must have been opened with the PROCESS_TERMINATE and 123 // SYNCHRONIZE permissions. 124 // 125 BASE_EXPORT void EnsureProcessTerminated(Process process); 126 127 #if defined(OS_POSIX) && !defined(OS_MACOSX) 128 // The nicer version of EnsureProcessTerminated() that is patient and will 129 // wait for |pid| to finish and then reap it. 130 BASE_EXPORT void EnsureProcessGetsReaped(ProcessId pid); 131 #endif 132 133 } // namespace base 134 135 #endif // BASE_PROCESS_KILL_H_ 136