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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef CONTENT_ZYGOTE_ZYGOTE_LINUX_H_ | 5 #ifndef CONTENT_ZYGOTE_ZYGOTE_LINUX_H_ |
| 6 #define CONTENT_ZYGOTE_ZYGOTE_LINUX_H_ | 6 #define CONTENT_ZYGOTE_ZYGOTE_LINUX_H_ |
| 7 | 7 |
| 8 #include <stddef.h> | 8 #include <stddef.h> |
| 9 | 9 |
| 10 #include <string> | 10 #include <string> |
| 11 | 11 |
| 12 #include "base/containers/small_map.h" | 12 #include "base/containers/small_map.h" |
| 13 #include "base/files/scoped_file.h" | 13 #include "base/files/scoped_file.h" |
| 14 #include "base/memory/scoped_vector.h" | 14 #include "base/memory/scoped_vector.h" |
| 15 #include "base/posix/global_descriptors.h" | 15 #include "base/posix/global_descriptors.h" |
| 16 #include "base/process/kill.h" | 16 #include "base/process/kill.h" |
| 17 #include "base/process/process.h" | 17 #include "base/process/process.h" |
| 18 | 18 |
| 19 namespace base { |
| 19 class Pickle; | 20 class Pickle; |
| 20 class PickleIterator; | 21 class PickleIterator; |
| 22 } |
| 21 | 23 |
| 22 namespace content { | 24 namespace content { |
| 23 | 25 |
| 24 class ZygoteForkDelegate; | 26 class ZygoteForkDelegate; |
| 25 | 27 |
| 26 // This is the object which implements the zygote. The ZygoteMain function, | 28 // This is the object which implements the zygote. The ZygoteMain function, |
| 27 // which is called from ChromeMain, simply constructs one of these objects and | 29 // which is called from ChromeMain, simply constructs one of these objects and |
| 28 // runs it. | 30 // runs it. |
| 29 class Zygote { | 31 class Zygote { |
| 30 public: | 32 public: |
| (...skipping 25 matching lines...) Expand all Loading... |
| 56 // Returns true if the NS sandbox is active. | 58 // Returns true if the NS sandbox is active. |
| 57 bool UsingNSSandbox() const; | 59 bool UsingNSSandbox() const; |
| 58 | 60 |
| 59 // --------------------------------------------------------------------------- | 61 // --------------------------------------------------------------------------- |
| 60 // Requests from the browser... | 62 // Requests from the browser... |
| 61 | 63 |
| 62 // Read and process a request from the browser. Returns true if we are in a | 64 // Read and process a request from the browser. Returns true if we are in a |
| 63 // new process and thus need to unwind back into ChromeMain. | 65 // new process and thus need to unwind back into ChromeMain. |
| 64 bool HandleRequestFromBrowser(int fd); | 66 bool HandleRequestFromBrowser(int fd); |
| 65 | 67 |
| 66 void HandleReapRequest(int fd, PickleIterator iter); | 68 void HandleReapRequest(int fd, base::PickleIterator iter); |
| 67 | 69 |
| 68 // Get the termination status of |real_pid|. |real_pid| is the PID as it | 70 // Get the termination status of |real_pid|. |real_pid| is the PID as it |
| 69 // appears outside of the sandbox. | 71 // appears outside of the sandbox. |
| 70 // Return true if it managed to get the termination status and return the | 72 // Return true if it managed to get the termination status and return the |
| 71 // status in |status| and the exit code in |exit_code|. | 73 // status in |status| and the exit code in |exit_code|. |
| 72 bool GetTerminationStatus(base::ProcessHandle real_pid, bool known_dead, | 74 bool GetTerminationStatus(base::ProcessHandle real_pid, bool known_dead, |
| 73 base::TerminationStatus* status, | 75 base::TerminationStatus* status, |
| 74 int* exit_code); | 76 int* exit_code); |
| 75 | 77 |
| 76 void HandleGetTerminationStatus(int fd, | 78 void HandleGetTerminationStatus(int fd, |
| 77 PickleIterator iter); | 79 base::PickleIterator iter); |
| 78 | 80 |
| 79 // This is equivalent to fork(), except that, when using the SUID sandbox, it | 81 // This is equivalent to fork(), except that, when using the SUID sandbox, it |
| 80 // returns the real PID of the child process as it appears outside the | 82 // returns the real PID of the child process as it appears outside the |
| 81 // sandbox, rather than returning the PID inside the sandbox. The child's | 83 // sandbox, rather than returning the PID inside the sandbox. The child's |
| 82 // real PID is determined by having it call content::SendZygoteChildPing(int) | 84 // real PID is determined by having it call content::SendZygoteChildPing(int) |
| 83 // using the |pid_oracle| descriptor. | 85 // using the |pid_oracle| descriptor. |
| 84 // Finally, when using a ZygoteForkDelegate helper, |uma_name|, |uma_sample|, | 86 // Finally, when using a ZygoteForkDelegate helper, |uma_name|, |uma_sample|, |
| 85 // and |uma_boundary_value| may be set if the helper wants to make a UMA | 87 // and |uma_boundary_value| may be set if the helper wants to make a UMA |
| 86 // report via UMA_HISTOGRAM_ENUMERATION. | 88 // report via UMA_HISTOGRAM_ENUMERATION. |
| 87 int ForkWithRealPid(const std::string& process_type, | 89 int ForkWithRealPid(const std::string& process_type, |
| 88 const base::GlobalDescriptors::Mapping& fd_mapping, | 90 const base::GlobalDescriptors::Mapping& fd_mapping, |
| 89 const std::string& channel_id, | 91 const std::string& channel_id, |
| 90 base::ScopedFD pid_oracle, | 92 base::ScopedFD pid_oracle, |
| 91 std::string* uma_name, | 93 std::string* uma_name, |
| 92 int* uma_sample, | 94 int* uma_sample, |
| 93 int* uma_boundary_value); | 95 int* uma_boundary_value); |
| 94 | 96 |
| 95 // Unpacks process type and arguments from |iter| and forks a new process. | 97 // Unpacks process type and arguments from |iter| and forks a new process. |
| 96 // Returns -1 on error, otherwise returns twice, returning 0 to the child | 98 // Returns -1 on error, otherwise returns twice, returning 0 to the child |
| 97 // process and the child process ID to the parent process, like fork(). | 99 // process and the child process ID to the parent process, like fork(). |
| 98 base::ProcessId ReadArgsAndFork(PickleIterator iter, | 100 base::ProcessId ReadArgsAndFork(base::PickleIterator iter, |
| 99 ScopedVector<base::ScopedFD> fds, | 101 ScopedVector<base::ScopedFD> fds, |
| 100 std::string* uma_name, | 102 std::string* uma_name, |
| 101 int* uma_sample, | 103 int* uma_sample, |
| 102 int* uma_boundary_value); | 104 int* uma_boundary_value); |
| 103 | 105 |
| 104 // Handle a 'fork' request from the browser: this means that the browser | 106 // Handle a 'fork' request from the browser: this means that the browser |
| 105 // wishes to start a new renderer. Returns true if we are in a new process, | 107 // wishes to start a new renderer. Returns true if we are in a new process, |
| 106 // otherwise writes the child_pid back to the browser via |fd|. Writes a | 108 // otherwise writes the child_pid back to the browser via |fd|. Writes a |
| 107 // child_pid of -1 on error. | 109 // child_pid of -1 on error. |
| 108 bool HandleForkRequest(int fd, | 110 bool HandleForkRequest(int fd, |
| 109 PickleIterator iter, | 111 base::PickleIterator iter, |
| 110 ScopedVector<base::ScopedFD> fds); | 112 ScopedVector<base::ScopedFD> fds); |
| 111 | 113 |
| 112 bool HandleGetSandboxStatus(int fd, | 114 bool HandleGetSandboxStatus(int fd, |
| 113 PickleIterator iter); | 115 base::PickleIterator iter); |
| 114 | 116 |
| 115 // The Zygote needs to keep some information about each process. Most | 117 // The Zygote needs to keep some information about each process. Most |
| 116 // notably what the PID of the process is inside the PID namespace of | 118 // notably what the PID of the process is inside the PID namespace of |
| 117 // the Zygote and whether or not a process was started by the | 119 // the Zygote and whether or not a process was started by the |
| 118 // ZygoteForkDelegate helper. | 120 // ZygoteForkDelegate helper. |
| 119 ZygoteProcessMap process_info_map_; | 121 ZygoteProcessMap process_info_map_; |
| 120 | 122 |
| 121 const int sandbox_flags_; | 123 const int sandbox_flags_; |
| 122 ScopedVector<ZygoteForkDelegate> helpers_; | 124 ScopedVector<ZygoteForkDelegate> helpers_; |
| 123 | 125 |
| 124 // Count of how many fork delegates for which we've invoked InitialUMA(). | 126 // Count of how many fork delegates for which we've invoked InitialUMA(). |
| 125 size_t initial_uma_index_; | 127 size_t initial_uma_index_; |
| 126 | 128 |
| 127 // This vector contains the PIDs of any child processes which have been | 129 // This vector contains the PIDs of any child processes which have been |
| 128 // created prior to the construction of the Zygote object, and must be reaped | 130 // created prior to the construction of the Zygote object, and must be reaped |
| 129 // before the Zygote exits. The Zygote will perform a blocking wait on these | 131 // before the Zygote exits. The Zygote will perform a blocking wait on these |
| 130 // children, so they must be guaranteed to be exiting by the time the Zygote | 132 // children, so they must be guaranteed to be exiting by the time the Zygote |
| 131 // exits. | 133 // exits. |
| 132 std::vector<base::ProcessHandle> extra_children_; | 134 std::vector<base::ProcessHandle> extra_children_; |
| 133 | 135 |
| 134 // This vector contains the FDs that must be closed before reaping the extra | 136 // This vector contains the FDs that must be closed before reaping the extra |
| 135 // children. | 137 // children. |
| 136 std::vector<int> extra_fds_; | 138 std::vector<int> extra_fds_; |
| 137 }; | 139 }; |
| 138 | 140 |
| 139 } // namespace content | 141 } // namespace content |
| 140 | 142 |
| 141 #endif // CONTENT_ZYGOTE_ZYGOTE_LINUX_H_ | 143 #endif // CONTENT_ZYGOTE_ZYGOTE_LINUX_H_ |
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