Line data Source code
1 : /*
2 : * Copyright (c) 2015 Cisco and/or its affiliates.
3 : * Licensed under the Apache License, Version 2.0 (the "License");
4 : * you may not use this file except in compliance with the License.
5 : * You may obtain a copy of the License at:
6 : *
7 : * http://www.apache.org/licenses/LICENSE-2.0
8 : *
9 : * Unless required by applicable law or agreed to in writing, software
10 : * distributed under the License is distributed on an "AS IS" BASIS,
11 : * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 : * See the License for the specific language governing permissions and
13 : * limitations under the License.
14 : */
15 : /*
16 : Copyright (c) 2005 Eliot Dresselhaus
17 :
18 : Permission is hereby granted, free of charge, to any person obtaining
19 : a copy of this software and associated documentation files (the
20 : "Software"), to deal in the Software without restriction, including
21 : without limitation the rights to use, copy, modify, merge, publish,
22 : distribute, sublicense, and/or sell copies of the Software, and to
23 : permit persons to whom the Software is furnished to do so, subject to
24 : the following conditions:
25 :
26 : The above copyright notice and this permission notice shall be
27 : included in all copies or substantial portions of the Software.
28 :
29 : THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 : EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 : MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 : NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
33 : LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
34 : OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35 : WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 : */
37 :
38 : #include <vppinfra/error.h>
39 : #include <vppinfra/os.h>
40 : #include <vppinfra/unix.h>
41 :
42 : #include <sys/stat.h>
43 : #include <sys/types.h>
44 : #include <sys/uio.h> /* writev */
45 : #include <fcntl.h>
46 : #include <stdio.h> /* for sprintf */
47 :
48 : __clib_export __thread uword __os_thread_index = 0;
49 : __clib_export __thread uword __os_numa_index = 0;
50 :
51 : clib_error_t *
52 0 : clib_file_n_bytes (char *file, uword * result)
53 : {
54 : struct stat s;
55 :
56 0 : if (stat (file, &s) < 0)
57 0 : return clib_error_return_unix (0, "stat `%s'", file);
58 :
59 0 : if (S_ISREG (s.st_mode))
60 0 : *result = s.st_size;
61 : else
62 0 : *result = 0;
63 :
64 0 : return /* no error */ 0;
65 : }
66 :
67 : clib_error_t *
68 0 : clib_file_read_contents (char *file, u8 * result, uword n_bytes)
69 : {
70 0 : int fd = -1;
71 : uword n_done, n_left;
72 0 : clib_error_t *error = 0;
73 0 : u8 *v = result;
74 :
75 0 : if ((fd = open (file, 0)) < 0)
76 0 : return clib_error_return_unix (0, "open `%s'", file);
77 :
78 0 : n_left = n_bytes;
79 0 : n_done = 0;
80 0 : while (n_left > 0)
81 : {
82 : int n_read;
83 0 : if ((n_read = read (fd, v + n_done, n_left)) < 0)
84 : {
85 0 : error = clib_error_return_unix (0, "open `%s'", file);
86 0 : goto done;
87 : }
88 :
89 : /* End of file. */
90 0 : if (n_read == 0)
91 0 : break;
92 :
93 0 : n_left -= n_read;
94 0 : n_done += n_read;
95 : }
96 :
97 0 : if (n_left > 0)
98 : {
99 : error =
100 0 : clib_error_return (0,
101 : " `%s' expected to read %wd bytes; read only %wd",
102 : file, n_bytes, n_bytes - n_left);
103 0 : goto done;
104 : }
105 :
106 0 : done:
107 0 : close (fd);
108 0 : return error;
109 : }
110 :
111 : __clib_export clib_error_t *
112 0 : clib_file_contents (char *file, u8 ** result)
113 : {
114 : uword n_bytes;
115 0 : clib_error_t *error = 0;
116 : u8 *v;
117 :
118 0 : if ((error = clib_file_n_bytes (file, &n_bytes)))
119 0 : return error;
120 :
121 0 : v = 0;
122 0 : vec_resize (v, n_bytes);
123 :
124 0 : error = clib_file_read_contents (file, v, n_bytes);
125 :
126 0 : if (error)
127 0 : vec_free (v);
128 : else
129 0 : *result = v;
130 :
131 0 : return error;
132 : }
133 :
134 : clib_error_t *
135 0 : unix_proc_file_contents (char *file, u8 ** result)
136 : {
137 0 : u8 *rv = 0;
138 : uword pos;
139 : int bytes, fd;
140 :
141 : /* Unfortunately, stat(/proc/XXX) returns zero... */
142 0 : fd = open (file, O_RDONLY);
143 :
144 0 : if (fd < 0)
145 0 : return clib_error_return_unix (0, "open `%s'", file);
146 :
147 0 : vec_validate (rv, 4095);
148 0 : pos = 0;
149 : while (1)
150 : {
151 0 : bytes = read (fd, rv + pos, 4096);
152 0 : if (bytes < 0)
153 : {
154 0 : close (fd);
155 0 : vec_free (rv);
156 0 : return clib_error_return_unix (0, "read '%s'", file);
157 : }
158 :
159 0 : if (bytes == 0)
160 : {
161 0 : vec_set_len (rv, pos);
162 0 : break;
163 : }
164 0 : pos += bytes;
165 0 : vec_validate (rv, pos + 4095);
166 : }
167 0 : *result = rv;
168 0 : close (fd);
169 0 : return 0;
170 : }
171 :
172 : void os_panic (void) __attribute__ ((weak));
173 :
174 : __clib_export void
175 0 : os_panic (void)
176 : {
177 0 : abort ();
178 : }
179 :
180 : void os_exit (int) __attribute__ ((weak));
181 :
182 : void
183 0 : os_exit (int code)
184 : {
185 0 : exit (code);
186 : }
187 :
188 : void os_puts (u8 * string, uword string_length, uword is_error)
189 : __attribute__ ((weak));
190 :
191 : void
192 546 : os_puts (u8 * string, uword string_length, uword is_error)
193 : {
194 546 : int cpu = os_get_thread_index ();
195 546 : int nthreads = os_get_nthreads ();
196 : char buf[64];
197 546 : int fd = is_error ? 2 : 1;
198 : struct iovec iovs[2];
199 546 : int n_iovs = 0;
200 :
201 546 : if (nthreads > 1)
202 : {
203 0 : snprintf (buf, sizeof (buf), "%d: ", cpu);
204 :
205 0 : iovs[n_iovs].iov_base = buf;
206 0 : iovs[n_iovs].iov_len = strlen (buf);
207 0 : n_iovs++;
208 : }
209 :
210 546 : iovs[n_iovs].iov_base = string;
211 546 : iovs[n_iovs].iov_len = string_length;
212 546 : n_iovs++;
213 :
214 546 : if (writev (fd, iovs, n_iovs) < 0)
215 : ;
216 546 : }
217 :
218 : __clib_export __clib_weak void
219 0 : os_out_of_memory (void)
220 : {
221 0 : os_panic ();
222 0 : }
223 :
224 : __clib_export __clib_weak uword
225 546 : os_get_nthreads (void)
226 : {
227 546 : return 1;
228 : }
229 :
230 : /*
231 : * fd.io coding-style-patch-verification: ON
232 : *
233 : * Local Variables:
234 : * eval: (c-set-style "gnu")
235 : * End:
236 : */
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