1 /*
2 *
3 * Copyright 2015 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 #include <grpc/support/port_platform.h>
20
21 #ifdef GPR_POSIX_SUBPROCESS
22
23 #include <assert.h>
24 #include <errno.h>
25 #include <signal.h>
26 #include <stdbool.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/types.h>
31 #include <sys/wait.h>
32 #include <unistd.h>
33
34 #include <grpc/support/alloc.h>
35 #include <grpc/support/log.h>
36
37 #include "test/core/util/subprocess.h"
38
39 struct gpr_subprocess {
40 int pid;
41 bool joined;
42 };
43
gpr_subprocess_binary_extension()44 const char* gpr_subprocess_binary_extension() { return ""; }
45
gpr_subprocess_create(int argc,const char ** argv)46 gpr_subprocess* gpr_subprocess_create(int argc, const char** argv) {
47 gpr_subprocess* r;
48 int pid;
49 char** exec_args;
50
51 pid = fork();
52 if (pid == -1) {
53 return nullptr;
54 } else if (pid == 0) {
55 exec_args = static_cast<char**>(
56 gpr_malloc((static_cast<size_t>(argc) + 1) * sizeof(char*)));
57 memcpy(exec_args, argv, static_cast<size_t>(argc) * sizeof(char*));
58 exec_args[argc] = nullptr;
59 execv(exec_args[0], exec_args);
60 /* if we reach here, an error has occurred */
61 gpr_log(GPR_ERROR, "execv '%s' failed: %s", exec_args[0], strerror(errno));
62 _exit(1);
63 return nullptr;
64 } else {
65 r = static_cast<gpr_subprocess*>(gpr_zalloc(sizeof(gpr_subprocess)));
66 r->pid = pid;
67 return r;
68 }
69 }
70
gpr_subprocess_destroy(gpr_subprocess * p)71 void gpr_subprocess_destroy(gpr_subprocess* p) {
72 if (!p->joined) {
73 kill(p->pid, SIGKILL);
74 gpr_subprocess_join(p);
75 }
76 gpr_free(p);
77 }
78
gpr_subprocess_join(gpr_subprocess * p)79 int gpr_subprocess_join(gpr_subprocess* p) {
80 int status;
81 retry:
82 if (waitpid(p->pid, &status, 0) == -1) {
83 if (errno == EINTR) {
84 goto retry;
85 }
86 gpr_log(GPR_ERROR, "waitpid failed for pid %d: %s", p->pid,
87 strerror(errno));
88 return -1;
89 }
90 p->joined = true;
91 return status;
92 }
93
gpr_subprocess_interrupt(gpr_subprocess * p)94 void gpr_subprocess_interrupt(gpr_subprocess* p) {
95 if (!p->joined) {
96 kill(p->pid, SIGINT);
97 }
98 }
99
100 #endif /* GPR_POSIX_SUBPROCESS */
101