Fix: close all file descriptors when executed as daemon
[lttng-tools.git] / src / bin / lttng / utils.c
CommitLineData
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1/*
2 * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca>
3 *
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4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
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7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
4c462e79 18#define _GNU_SOURCE
f3ed775e 19#include <stdlib.h>
679b4943 20#include <ctype.h>
3badf2bf 21#include <limits.h>
f3ed775e 22
db758600 23#include <common/error.h>
f3ed775e 24
beb8c75a 25#include "conf.h"
679b4943 26#include "utils.h"
f3ed775e 27
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28/*
29 * Return the realpath(3) of the path even if the last directory token does not
30 * exist. For example, with /tmp/test1/test2, if test2/ does not exist but the
31 * /tmp/test1 does, the real path is returned. In normal time, realpath(3)
32 * fails if the end point directory does not exist.
33 */
34char *expand_full_path(const char *path)
35{
36 const char *end_path = path;
37 char *next, *cut_path, *expanded_path;
38
39 /* Find last token delimited by '/' */
40 while ((next = strpbrk(end_path + 1, "/"))) {
41 end_path = next;
42 }
43
44 /* Cut last token from original path */
45 cut_path = strndup(path, end_path - path);
46
47 expanded_path = malloc(PATH_MAX);
48 if (expanded_path == NULL) {
49 goto error;
50 }
51
52 expanded_path = realpath((char *)cut_path, expanded_path);
53 if (expanded_path == NULL) {
54 switch (errno) {
55 case ENOENT:
56 ERR("%s: No such file or directory", cut_path);
57 break;
58 default:
59 perror("realpath");
60 break;
61 }
62 goto error;
63 }
64
65 /* Add end part to expanded path */
66 strcat(expanded_path, end_path);
67
68 free(cut_path);
69 return expanded_path;
70
71error:
72 free(cut_path);
73 return NULL;
74}
75
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76/*
77 * get_session_name
78 *
79 * Return allocated string with the session name found in the config
80 * directory.
81 */
82char *get_session_name(void)
83{
84 char *path, *session_name = NULL;
85
86 /* Get path to config file */
58a97671 87 path = config_get_default_path();
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88 if (path == NULL) {
89 goto error;
90 }
91
92 /* Get session name from config */
93 session_name = config_read_session_name(path);
94 if (session_name == NULL) {
58a97671 95 goto error;
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96 }
97
3183dbb0 98 DBG2("Config file path found: %s", path);
cd80958d 99 DBG("Session name found: %s", session_name);
f3ed775e 100 return session_name;
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101
102error:
103 return NULL;
f3ed775e 104}
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105
106
107/*
108 * list_cmd_options
109 *
110 * Prints a simple list of the options available to a command. This is intended
111 * to be easily parsed for bash completion.
112 */
113void list_cmd_options(FILE *ofp, struct poptOption *options)
114{
115 int i;
116 struct poptOption *option = NULL;
117
118 for (i = 0; options[i].longName != NULL; i++) {
119 option = &options[i];
120
121 fprintf(ofp, "--%s\n", option->longName);
122
123 if (isprint(option->shortName)) {
124 fprintf(ofp, "-%c\n", option->shortName);
125 }
126 }
127}
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