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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*/
#include <config.h>
#include <stdio.h>
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <LongBow/longBow_SubProcess.h>
#include <LongBow/private/longBow_Memory.h>
struct longbow_subprocess {
const char *path;
char **arguments;
pid_t pid;
int exitStatus;
struct rusage rusage;
};
static void
_resetAllSignals(void)
{
struct sigaction signalAction;
signalAction.sa_handler = SIG_DFL;
signalAction.sa_flags = SA_SIGINFO;
sigemptyset(&signalAction.sa_mask);
for (int i = 1; i < NSIG; i++) {
sigaction(i, &signalAction, NULL);
}
}
LongBowSubProcess *
longBowSubProcess_Exec(const char *path, ... /*, (char *)0 */)
{
va_list ap;
va_start(ap, path);
size_t count = 0;
for (char *arg = va_arg(ap, char *); arg != NULL; arg = va_arg(ap, char *)) {
count++;
}
LongBowSubProcess *result = longBowMemory_Allocate(sizeof(LongBowSubProcess));
result->path = path;
longBowMemory_Allocate(sizeof(char *) * count + 1);
va_end(ap);
// This relies on the last element being all zeros.
va_start(ap, path);
for (size_t i = 0; i < count; i++) {
result->arguments[i] = va_arg(ap, char *);
}
va_end(ap);
result->pid = fork();
if (result->pid == 0) {
_resetAllSignals();
printf("Exec %s\n", result->path);
int error = execv(result->path, result->arguments);
printf("Error %d\n", error);
perror(path);
exit(1);
}
printf("Process group child=%d, parent=%d\n", getpgid(result->pid), getpgrp());
return result;
}
void
longBowSubProcess_Destroy(LongBowSubProcess **processPtr)
{
LongBowSubProcess *process = *processPtr;
if (process->pid) {
longBowSubProcess_Signal(process, SIGKILL);
}
longBowMemory_Deallocate((void **) process->arguments);
longBowMemory_Deallocate((void **) processPtr);
}
bool
longBowSubProcess_Terminate(LongBowSubProcess *subProcess)
{
return longBowSubProcess_Signal(subProcess, SIGTERM);
}
bool
longBowSubProcess_Signal(LongBowSubProcess *subProcess, int signalNumber)
{
return kill(subProcess->pid, signalNumber) == 0;
}
void
longBowSubProcess_Wait(LongBowSubProcess *subProcess)
{
wait4(subProcess->pid, &subProcess->exitStatus, 0, &subProcess->rusage);
subProcess->pid = 0;
}
void
longBowSubProcess_Display(const LongBowSubProcess *subprocess, int indentation)
{
printf("%*s%s: ", indentation, "", subprocess->path);
if (subprocess->pid == 0) {
printf("not running .exitStatus=%d ", subprocess->exitStatus);
} else {
printf(".pid=%d", subprocess->pid);
}
printf("\n");
}
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