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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 COPYRIGHT
* OWNER OR CONTRIBUTORS 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 <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 = 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_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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