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/**
* @file bprocess_example.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stddef.h>
#include <unistd.h>
#include <misc/debug.h>
#include <base/DebugObject.h>
#include <base/BLog.h>
#include <system/BReactor.h>
#include <system/BUnixSignal.h>
#include <system/BTime.h>
#include <system/BProcess.h>
BReactor reactor;
BUnixSignal unixsignal;
BProcessManager manager;
BProcess process;
static void unixsignal_handler (void *user, int signo);
static void process_handler (void *user, int normally, uint8_t normally_exit_status);
int main (int argc, char **argv)
{
if (argc <= 0) {
return 1;
}
int ret = 1;
if (argc < 2) {
printf("Usage: %s <program> [argument ...]\n", argv[0]);
goto fail0;
}
char *program = argv[1];
// init time
BTime_Init();
// init logger
BLog_InitStdout();
// init reactor (event loop)
if (!BReactor_Init(&reactor)) {
DEBUG("BReactor_Init failed");
goto fail1;
}
// choose signals to catch
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGTERM);
// init BUnixSignal for catching signals
if (!BUnixSignal_Init(&unixsignal, &reactor, set, unixsignal_handler, NULL)) {
DEBUG("BUnixSignal_Init failed");
goto fail2;
}
// init process manager
if (!BProcessManager_Init(&manager, &reactor)) {
DEBUG("BProcessManager_Init failed");
goto fail3;
}
char **p_argv = argv + 1;
// map fds 0, 1, 2 in child to fds 0, 1, 2 in parent
int fds[] = { 0, 1, 2, -1 };
int fds_map[] = { 0, 1, 2 };
// start child process
if (!BProcess_InitWithFds(&process, &manager, process_handler, NULL, program, p_argv, NULL, fds, fds_map)) {
DEBUG("BProcess_Init failed");
goto fail4;
}
// enter event loop
ret = BReactor_Exec(&reactor);
BProcess_Free(&process);
fail4:
BProcessManager_Free(&manager);
fail3:
BUnixSignal_Free(&unixsignal, 0);
fail2:
BReactor_Free(&reactor);
fail1:
BLog_Free();
fail0:
DebugObjectGlobal_Finish();
return ret;
}
void unixsignal_handler (void *user, int signo)
{
DEBUG("received %s, terminating child", (signo == SIGINT ? "SIGINT" : "SIGTERM"));
// send SIGTERM to child
BProcess_Terminate(&process);
}
void process_handler (void *user, int normally, uint8_t normally_exit_status)
{
DEBUG("process terminated");
int ret = (normally ? normally_exit_status : 1);
// return from event loop
BReactor_Quit(&reactor, ret);
}
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