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/*
*
* Copyright 2015 gRPC authors.
*
* 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 <grpc/support/port_platform.h>
#ifdef GPR_POSIX_SUBPROCESS
#include <grpc/support/subprocess.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
struct gpr_subprocess {
int pid;
bool joined;
};
const char *gpr_subprocess_binary_extension() { return ""; }
gpr_subprocess *gpr_subprocess_create(int argc, const char **argv) {
gpr_subprocess *r;
int pid;
char **exec_args;
pid = fork();
if (pid == -1) {
return NULL;
} else if (pid == 0) {
exec_args = (char **)gpr_malloc(((size_t)argc + 1) * sizeof(char *));
memcpy(exec_args, argv, (size_t)argc * sizeof(char *));
exec_args[argc] = NULL;
execv(exec_args[0], exec_args);
/* if we reach here, an error has occurred */
gpr_log(GPR_ERROR, "execv '%s' failed: %s", exec_args[0], strerror(errno));
_exit(1);
return NULL;
} else {
r = (gpr_subprocess *)gpr_zalloc(sizeof(gpr_subprocess));
r->pid = pid;
return r;
}
}
void gpr_subprocess_destroy(gpr_subprocess *p) {
if (!p->joined) {
kill(p->pid, SIGKILL);
gpr_subprocess_join(p);
}
gpr_free(p);
}
int gpr_subprocess_join(gpr_subprocess *p) {
int status;
retry:
if (waitpid(p->pid, &status, 0) == -1) {
if (errno == EINTR) {
goto retry;
}
gpr_log(GPR_ERROR, "waitpid failed for pid %d: %s", p->pid,
strerror(errno));
return -1;
}
p->joined = true;
return status;
}
void gpr_subprocess_interrupt(gpr_subprocess *p) {
if (!p->joined) {
kill(p->pid, SIGINT);
}
}
#endif /* GPR_POSIX_SUBPROCESS */
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