process_helpers.c revision 275988 
1/* Copyright (c) 2008 The NetBSD Foundation, Inc.
2 * All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
14 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
15 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
16 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
20 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
22 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
24 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  */
25
26#include <sys/types.h>
27
28#include <assert.h> /* NO_CHECK_STYLE */
29#include <signal.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <unistd.h>
34
35static
36int
37h_echo(const char *msg)
38{
39    printf("%s\n", msg);
40    return EXIT_SUCCESS;
41}
42
43static
44int
45h_exit_failure(void)
46{
47    return EXIT_FAILURE;
48}
49
50static
51int
52h_exit_signal(void)
53{
54    kill(getpid(), SIGKILL);
55    assert(0); /* NO_CHECK_STYLE */
56    return EXIT_FAILURE;
57}
58
59static
60int
61h_exit_success(void)
62{
63    return EXIT_SUCCESS;
64}
65
66static
67int
68h_stdout_stderr(const char *id)
69{
70    fprintf(stdout, "Line 1 to stdout for %s\n", id);
71    fprintf(stdout, "Line 2 to stdout for %s\n", id);
72    fprintf(stderr, "Line 1 to stderr for %s\n", id);
73    fprintf(stderr, "Line 2 to stderr for %s\n", id);
74
75    return EXIT_SUCCESS;
76}
77
78static
79void
80check_args(const int argc, const char *const argv[], const int required)
81{
82    if (argc < required) {
83        fprintf(stderr, "Usage: %s helper-name [args]\n", argv[0]);
84        exit(EXIT_FAILURE);
85    }
86}
87
88int
89main(int argc, const char *const argv[])
90{
91    int exitcode;
92
93    check_args(argc, argv, 2);
94
95    if (strcmp(argv[1], "echo") == 0) {
96        check_args(argc, argv, 3);
97        exitcode = h_echo(argv[2]);
98    } else if (strcmp(argv[1], "exit-failure") == 0)
99        exitcode = h_exit_failure();
100    else if (strcmp(argv[1], "exit-signal") == 0)
101        exitcode = h_exit_signal();
102    else if (strcmp(argv[1], "exit-success") == 0)
103        exitcode = h_exit_success();
104    else if (strcmp(argv[1], "stdout-stderr") == 0) {
105        check_args(argc, argv, 3);
106        exitcode = h_stdout_stderr(argv[2]);
107    } else {
108        fprintf(stderr, "%s: Unknown helper %s\n", argv[0], argv[1]);
109        exitcode = EXIT_FAILURE;
110    }
111
112    return exitcode;
113}
114