201 lines
7.8 KiB
C
201 lines
7.8 KiB
C
/**
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* @file BProcess.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef BADVPN_BPROCESS_H
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#define BADVPN_BPROCESS_H
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#include <stdint.h>
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#include <unistd.h>
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#include <misc/debug.h>
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#include <misc/debugerror.h>
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#include <structure/LinkedList1.h>
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#include <base/DebugObject.h>
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#include <system/BUnixSignal.h>
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#include <base/BPending.h>
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/**
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* Manages child processes.
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* There may be at most one process manager at any given time. This restriction is not
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* enforced, however.
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*/
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typedef struct {
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BReactor *reactor;
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BUnixSignal signal;
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LinkedList1 processes;
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BPending wait_job;
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DebugObject d_obj;
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} BProcessManager;
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/**
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* Handler called when the process terminates.
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* The process object must be freed from the job context of this handler.
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* {@link BProcess_Terminate} or {@link BProcess_Kill} must not be called
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* after this handler is called.
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*
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* @param user as in {@link BProcess_InitWithFds} or {@link BProcess_Init}
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* @param normally whether the child process terminated normally (0 or 1)
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* @param normally_exit_status if the child process terminated normally, its exit
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* status; otherwise undefined
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*/
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typedef void (*BProcess_handler) (void *user, int normally, uint8_t normally_exit_status);
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/**
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* Represents a child process.
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*/
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typedef struct {
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BProcessManager *m;
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BProcess_handler handler;
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void *user;
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pid_t pid;
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LinkedList1Node list_node; // node in BProcessManager.processes
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DebugObject d_obj;
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DebugError d_err;
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} BProcess;
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/**
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* Initializes the process manager.
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* There may be at most one process manager at any given time. This restriction is not
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* enforced, however.
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*
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* @param o the object
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* @param reactor reactor we live in
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* @return 1 on success, 0 on failure
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*/
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int BProcessManager_Init (BProcessManager *o, BReactor *reactor) WARN_UNUSED;
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/**
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* Frees the process manager.
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* There must be no {@link BProcess} objects using this process manager.
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*
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* @param o the object
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*/
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void BProcessManager_Free (BProcessManager *o);
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struct BProcess_params {
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const char *username;
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const int *fds;
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const int *fds_map;
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int do_setsid;
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};
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/**
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* Initializes the process.
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* 'file', 'argv', 'username', 'fds' and 'fds_map' arguments are only used during this
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* function call.
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* If no file descriptor is mapped to a standard stream (file descriptors 0, 1, 2),
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* then /dev/null will be opened in the child for that standard stream.
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*
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* @param o the object
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* @param m process manager
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* @param handler handler called when the process terminates
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* @param user argument to handler
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* @param file path to executable file
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* @param argv arguments array, including the zeroth argument, terminated with a NULL pointer
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* @param params.username user account to run the program as, or NULL to not switch user
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* @param params.fds array of file descriptors in the parent to map to file descriptors in the child,
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* terminated with -1
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* @param params.fds_map array of file descriptors in the child that file descriptors in 'fds' will
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* be mapped to, in the same order. Must contain the same number of file descriptors
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* as the 'fds' argument, and does not have to be terminated with -1.
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* @param params.do_setsid if set to non-zero, will make the child call setsid() before exec'ing.
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* Failure of setsid() will be ignored.
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* @return 1 on success, 0 on failure
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*/
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int BProcess_Init2 (BProcess *o, BProcessManager *m, BProcess_handler handler, void *user, const char *file, char *const argv[], struct BProcess_params params) WARN_UNUSED;
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/**
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* Initializes the process.
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* 'file', 'argv', 'username', 'fds' and 'fds_map' arguments are only used during this
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* function call.
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* If no file descriptor is mapped to a standard stream (file descriptors 0, 1, 2),
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* then /dev/null will be opened in the child for that standard stream.
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*
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* @param o the object
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* @param m process manager
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* @param handler handler called when the process terminates
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* @param user argument to handler
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* @param file path to executable file
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* @param argv arguments array, including the zeroth argument, terminated with a NULL pointer
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* @param username user account to run the program as, or NULL to not switch user
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* @param fds array of file descriptors in the parent to map to file descriptors in the child,
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* terminated with -1
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* @param fds_map array of file descriptors in the child that file descriptors in 'fds' will
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* be mapped to, in the same order. Must contain the same number of file descriptors
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* as the 'fds' argument, and does not have to be terminated with -1.
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* @return 1 on success, 0 on failure
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*/
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int BProcess_InitWithFds (BProcess *o, BProcessManager *m, BProcess_handler handler, void *user, const char *file, char *const argv[], const char *username, const int *fds, const int *fds_map) WARN_UNUSED;
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/**
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* Initializes the process.
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* Like {@link BProcess_InitWithFds}, but without file descriptor mapping.
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* 'file', 'argv' and 'username' arguments are only used during this function call.
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*
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* @param o the object
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* @param m process manager
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* @param handler handler called when the process terminates
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* @param user argument to handler
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* @param file path to executable file
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* @param argv arguments array, including the zeroth argument, terminated with a NULL pointer
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* @param username user account to run the program as, or NULL to not switch user
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* @return 1 on success, 0 on failure
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*/
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int BProcess_Init (BProcess *o, BProcessManager *m, BProcess_handler handler, void *user, const char *file, char *const argv[], const char *username) WARN_UNUSED;
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/**
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* Frees the process.
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* This does not do anything with the actual child process; it only prevents the user to wait
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* for its termination. If the process terminates while a process manager is running, it will still
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* be waited for (and will not become a zombie).
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*
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* @param o the object
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*/
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void BProcess_Free (BProcess *o);
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/**
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* Sends the process the SIGTERM signal.
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* Success of this action does NOT mean that the child has terminated.
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*
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* @param o the object
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* @return 1 on success, 0 on failure
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*/
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int BProcess_Terminate (BProcess *o);
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/**
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* Sends the process the SIGKILL signal.
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* Success of this action does NOT mean that the child has terminated.
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*
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* @param o the object
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* @return 1 on success, 0 on failure
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*/
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int BProcess_Kill (BProcess *o);
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#endif
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