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Commit | Line | Data |
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8148217b | 1 | /* |
b295bdb1 BS |
2 | * Simple functions to access files. Paths can be globally prefixed to read |
3 | * data from an alternative source (e.g. a /proc dump for regression tests). | |
8148217b HC |
4 | * |
5 | * Copyright (C) 2008 Cai Qian <qcai@redhat.com> | |
ca01695b | 6 | * Copyright (C) 2008-2012 Karel Zak <kzak@redhat.com> |
8148217b HC |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it would be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
7cebf0bb SK |
18 | * You should have received a copy of the GNU General Public License along |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
8148217b HC |
21 | */ |
22 | ||
23 | #include <stdarg.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | #include <stdio.h> | |
37a5c7ee | 27 | #include <inttypes.h> |
8148217b HC |
28 | #include <errno.h> |
29 | ||
e12c9866 | 30 | #include "all-io.h" |
8148217b HC |
31 | #include "path.h" |
32 | #include "nls.h" | |
33 | #include "c.h" | |
34 | ||
35 | static size_t prefixlen; | |
36 | static char pathbuf[PATH_MAX]; | |
37 | ||
38 | static const char * | |
39 | path_vcreate(const char *path, va_list ap) | |
40 | { | |
f567220b RM |
41 | int rc = vsnprintf( |
42 | pathbuf + prefixlen, sizeof(pathbuf) - prefixlen, path, ap); | |
43 | ||
44 | if (rc < 0) | |
45 | return NULL; | |
46 | if ((size_t)rc >= sizeof(pathbuf)) { | |
47 | errno = ENAMETOOLONG; | |
48 | return NULL; | |
49 | } | |
8148217b HC |
50 | return pathbuf; |
51 | } | |
52 | ||
81435af3 RM |
53 | const char * |
54 | path_get(const char *path, ...) | |
dd3bc51a KZ |
55 | { |
56 | const char *p; | |
57 | va_list ap; | |
58 | ||
59 | va_start(ap, path); | |
60 | p = path_vcreate(path, ap); | |
61 | va_end(ap); | |
62 | ||
81435af3 | 63 | return p; |
dd3bc51a KZ |
64 | } |
65 | ||
8148217b HC |
66 | static FILE * |
67 | path_vfopen(const char *mode, int exit_on_error, const char *path, va_list ap) | |
68 | { | |
69 | FILE *f; | |
70 | const char *p = path_vcreate(path, ap); | |
f567220b RM |
71 | if (!p) |
72 | goto err; | |
8148217b HC |
73 | |
74 | f = fopen(p, mode); | |
f567220b RM |
75 | if (!f) |
76 | goto err; | |
77 | ||
8148217b | 78 | return f; |
f567220b RM |
79 | err: |
80 | if (exit_on_error) | |
81 | err(EXIT_FAILURE, _("cannot open %s"), p ? p : "path"); | |
82 | return NULL; | |
8148217b HC |
83 | } |
84 | ||
9bc2b4b1 HC |
85 | static int |
86 | path_vopen(int flags, const char *path, va_list ap) | |
87 | { | |
88 | int fd; | |
89 | const char *p = path_vcreate(path, ap); | |
f567220b RM |
90 | if (!p) |
91 | goto err; | |
9bc2b4b1 HC |
92 | |
93 | fd = open(p, flags); | |
94 | if (fd == -1) | |
f567220b RM |
95 | goto err; |
96 | ||
9bc2b4b1 | 97 | return fd; |
f567220b RM |
98 | err: |
99 | err(EXIT_FAILURE, _("cannot open %s"), p ? p : "path"); | |
9bc2b4b1 HC |
100 | } |
101 | ||
8148217b HC |
102 | FILE * |
103 | path_fopen(const char *mode, int exit_on_error, const char *path, ...) | |
104 | { | |
105 | FILE *fd; | |
106 | va_list ap; | |
107 | ||
108 | va_start(ap, path); | |
109 | fd = path_vfopen(mode, exit_on_error, path, ap); | |
110 | va_end(ap); | |
111 | ||
112 | return fd; | |
113 | } | |
114 | ||
115 | void | |
ca01695b | 116 | path_read_str(char *result, size_t len, const char *path, ...) |
8148217b HC |
117 | { |
118 | FILE *fd; | |
119 | va_list ap; | |
120 | ||
121 | va_start(ap, path); | |
b1fa3e22 | 122 | fd = path_vfopen("r" UL_CLOEXECSTR, 1, path, ap); |
8148217b HC |
123 | va_end(ap); |
124 | ||
125 | if (!fgets(result, len, fd)) | |
47481cbd | 126 | err(EXIT_FAILURE, _("cannot read %s"), pathbuf); |
8148217b HC |
127 | fclose(fd); |
128 | ||
129 | len = strlen(result); | |
130 | if (result[len - 1] == '\n') | |
131 | result[len - 1] = '\0'; | |
132 | } | |
133 | ||
134 | int | |
ca01695b | 135 | path_read_s32(const char *path, ...) |
8148217b HC |
136 | { |
137 | FILE *fd; | |
138 | va_list ap; | |
139 | int result; | |
140 | ||
141 | va_start(ap, path); | |
b1fa3e22 | 142 | fd = path_vfopen("r" UL_CLOEXECSTR, 1, path, ap); |
8148217b HC |
143 | va_end(ap); |
144 | ||
145 | if (fscanf(fd, "%d", &result) != 1) { | |
146 | if (ferror(fd)) | |
47481cbd | 147 | err(EXIT_FAILURE, _("cannot read %s"), pathbuf); |
8148217b HC |
148 | else |
149 | errx(EXIT_FAILURE, _("parse error: %s"), pathbuf); | |
150 | } | |
151 | fclose(fd); | |
152 | return result; | |
153 | } | |
154 | ||
37a5c7ee KZ |
155 | uint64_t |
156 | path_read_u64(const char *path, ...) | |
157 | { | |
158 | FILE *fd; | |
159 | va_list ap; | |
160 | uint64_t result; | |
161 | ||
162 | va_start(ap, path); | |
163 | fd = path_vfopen("r", 1, path, ap); | |
164 | va_end(ap); | |
165 | ||
166 | if (fscanf(fd, "%"SCNu64, &result) != 1) { | |
167 | if (ferror(fd)) | |
47481cbd | 168 | err(EXIT_FAILURE, _("cannot read %s"), pathbuf); |
37a5c7ee KZ |
169 | else |
170 | errx(EXIT_FAILURE, _("parse error: %s"), pathbuf); | |
171 | } | |
172 | fclose(fd); | |
173 | return result; | |
174 | } | |
175 | ||
9bc2b4b1 | 176 | int |
ca01695b | 177 | path_write_str(const char *str, const char *path, ...) |
9bc2b4b1 HC |
178 | { |
179 | int fd, result; | |
180 | va_list ap; | |
181 | ||
182 | va_start(ap, path); | |
b1fa3e22 | 183 | fd = path_vopen(O_WRONLY|O_CLOEXEC, path, ap); |
9bc2b4b1 | 184 | va_end(ap); |
25dea0b5 | 185 | result = write_all(fd, str, strlen(str)); |
9bc2b4b1 HC |
186 | close(fd); |
187 | return result; | |
188 | } | |
189 | ||
8148217b HC |
190 | int |
191 | path_exist(const char *path, ...) | |
192 | { | |
193 | va_list ap; | |
194 | const char *p; | |
195 | ||
196 | va_start(ap, path); | |
197 | p = path_vcreate(path, ap); | |
198 | va_end(ap); | |
199 | ||
f567220b | 200 | return p && access(p, F_OK) == 0; |
8148217b HC |
201 | } |
202 | ||
e21e6d26 KZ |
203 | #ifdef HAVE_CPU_SET_T |
204 | ||
8148217b HC |
205 | static cpu_set_t * |
206 | path_cpuparse(int maxcpus, int islist, const char *path, va_list ap) | |
207 | { | |
208 | FILE *fd; | |
209 | cpu_set_t *set; | |
210 | size_t setsize, len = maxcpus * 7; | |
211 | char buf[len]; | |
212 | ||
b1fa3e22 | 213 | fd = path_vfopen("r" UL_CLOEXECSTR, 1, path, ap); |
8148217b HC |
214 | |
215 | if (!fgets(buf, len, fd)) | |
47481cbd | 216 | err(EXIT_FAILURE, _("cannot read %s"), pathbuf); |
8148217b HC |
217 | fclose(fd); |
218 | ||
219 | len = strlen(buf); | |
220 | if (buf[len - 1] == '\n') | |
221 | buf[len - 1] = '\0'; | |
222 | ||
223 | set = cpuset_alloc(maxcpus, &setsize, NULL); | |
224 | if (!set) | |
225 | err(EXIT_FAILURE, _("failed to callocate cpu set")); | |
226 | ||
227 | if (islist) { | |
228 | if (cpulist_parse(buf, set, setsize, 0)) | |
229 | errx(EXIT_FAILURE, _("failed to parse CPU list %s"), buf); | |
230 | } else { | |
231 | if (cpumask_parse(buf, set, setsize)) | |
232 | errx(EXIT_FAILURE, _("failed to parse CPU mask %s"), buf); | |
233 | } | |
234 | return set; | |
235 | } | |
236 | ||
237 | cpu_set_t * | |
ca01695b | 238 | path_read_cpuset(int maxcpus, const char *path, ...) |
8148217b HC |
239 | { |
240 | va_list ap; | |
241 | cpu_set_t *set; | |
242 | ||
243 | va_start(ap, path); | |
244 | set = path_cpuparse(maxcpus, 0, path, ap); | |
245 | va_end(ap); | |
246 | ||
247 | return set; | |
248 | } | |
249 | ||
250 | cpu_set_t * | |
ca01695b | 251 | path_read_cpulist(int maxcpus, const char *path, ...) |
8148217b HC |
252 | { |
253 | va_list ap; | |
254 | cpu_set_t *set; | |
255 | ||
256 | va_start(ap, path); | |
257 | set = path_cpuparse(maxcpus, 1, path, ap); | |
258 | va_end(ap); | |
259 | ||
260 | return set; | |
261 | } | |
262 | ||
e230ae7b | 263 | int |
ca01695b | 264 | path_set_prefix(const char *prefix) |
8148217b | 265 | { |
e230ae7b RM |
266 | size_t len = strlen(prefix); |
267 | ||
268 | if (len >= sizeof(pathbuf) - 1) { | |
269 | errno = ENAMETOOLONG; | |
270 | return -1; | |
271 | } | |
272 | prefixlen = len; | |
273 | strcpy(pathbuf, prefix); | |
274 | return 0; | |
8148217b | 275 | } |
4a04d7f3 RM |
276 | |
277 | #endif /* HAVE_CPU_SET_T */ |