FD.io VPP  v21.06-3-gbb25fbf28
Vector Packet Processing
unix-misc.c
Go to the documentation of this file.
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 
52 clib_file_n_bytes (char *file, uword * result)
53 {
54  struct stat s;
55 
56  if (stat (file, &s) < 0)
57  return clib_error_return_unix (0, "stat `%s'", file);
58 
59  if (S_ISREG (s.st_mode))
60  *result = s.st_size;
61  else
62  *result = 0;
63 
64  return /* no error */ 0;
65 }
66 
68 clib_file_read_contents (char *file, u8 * result, uword n_bytes)
69 {
70  int fd = -1;
71  uword n_done, n_left;
72  clib_error_t *error = 0;
73  u8 *v = result;
74 
75  if ((fd = open (file, 0)) < 0)
76  return clib_error_return_unix (0, "open `%s'", file);
77 
78  n_left = n_bytes;
79  n_done = 0;
80  while (n_left > 0)
81  {
82  int n_read;
83  if ((n_read = read (fd, v + n_done, n_left)) < 0)
84  {
85  error = clib_error_return_unix (0, "open `%s'", file);
86  goto done;
87  }
88 
89  /* End of file. */
90  if (n_read == 0)
91  break;
92 
93  n_left -= n_read;
94  n_done += n_read;
95  }
96 
97  if (n_left > 0)
98  {
99  error =
101  " `%s' expected to read %wd bytes; read only %wd",
102  file, n_bytes, n_bytes - n_left);
103  goto done;
104  }
105 
106 done:
107  close (fd);
108  return error;
109 }
110 
111 __clib_export clib_error_t *
112 clib_file_contents (char *file, u8 ** result)
113 {
114  uword n_bytes;
115  clib_error_t *error = 0;
116  u8 *v;
117 
118  if ((error = clib_file_n_bytes (file, &n_bytes)))
119  return error;
120 
121  v = 0;
122  vec_resize (v, n_bytes);
123 
125 
126  if (error)
127  vec_free (v);
128  else
129  *result = v;
130 
131  return error;
132 }
133 
134 clib_error_t *
135 unix_proc_file_contents (char *file, u8 ** result)
136 {
137  u8 *rv = 0;
138  uword pos;
139  int bytes, fd;
140 
141  /* Unfortunately, stat(/proc/XXX) returns zero... */
142  fd = open (file, O_RDONLY);
143 
144  if (fd < 0)
145  return clib_error_return_unix (0, "open `%s'", file);
146 
147  vec_validate (rv, 4095);
148  pos = 0;
149  while (1)
150  {
151  bytes = read (fd, rv + pos, 4096);
152  if (bytes < 0)
153  {
154  close (fd);
155  vec_free (rv);
156  return clib_error_return_unix (0, "read '%s'", file);
157  }
158 
159  if (bytes == 0)
160  {
161  _vec_len (rv) = pos;
162  break;
163  }
164  pos += bytes;
165  vec_validate (rv, pos + 4095);
166  }
167  *result = rv;
168  close (fd);
169  return 0;
170 }
171 
172 void os_panic (void) __attribute__ ((weak));
173 
174 __clib_export void
175 os_panic (void)
176 {
177  abort ();
178 }
179 
180 void os_exit (int) __attribute__ ((weak));
181 
182 void
183 os_exit (int code)
184 {
185  exit (code);
186 }
187 
188 void os_puts (u8 * string, uword string_length, uword is_error)
189  __attribute__ ((weak));
190 
191 void
192 os_puts (u8 * string, uword string_length, uword is_error)
193 {
194  int cpu = os_get_thread_index ();
195  int nthreads = os_get_nthreads ();
196  char buf[64];
197  int fd = is_error ? 2 : 1;
198  struct iovec iovs[2];
199  int n_iovs = 0;
200 
201  if (nthreads > 1)
202  {
203  snprintf (buf, sizeof (buf), "%d: ", cpu);
204 
205  iovs[n_iovs].iov_base = buf;
206  iovs[n_iovs].iov_len = strlen (buf);
207  n_iovs++;
208  }
209 
210  iovs[n_iovs].iov_base = string;
211  iovs[n_iovs].iov_len = string_length;
212  n_iovs++;
213 
214  if (writev (fd, iovs, n_iovs) < 0)
215  ;
216 }
217 
218 __clib_export __clib_weak void
220 {
221  os_panic ();
222 }
223 
224 __clib_export __clib_weak uword
226 {
227  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  */
os.h
clib_file_n_bytes
clib_error_t * clib_file_n_bytes(char *file, uword *result)
Definition: unix-misc.c:52
os_exit
void os_exit(int)
Definition: unix-misc.c:183
clib_error_return
#define clib_error_return(e, args...)
Definition: error.h:99
os_panic
void os_panic(void)
Definition: unix-misc.c:175
clib_file_read_contents
clib_error_t * clib_file_read_contents(char *file, u8 *result, uword n_bytes)
Definition: unix-misc.c:68
os_get_nthreads
__clib_export __clib_weak uword os_get_nthreads(void)
Definition: unix-misc.c:225
clib_file_contents
__clib_export clib_error_t * clib_file_contents(char *file, u8 **result)
Definition: unix-misc.c:112
error
Definition: cJSON.c:88
error.h
uword
u64 uword
Definition: types.h:112
os_out_of_memory
__clib_export __clib_weak void os_out_of_memory(void)
Definition: unix-misc.c:219
unix_proc_file_contents
clib_error_t * unix_proc_file_contents(char *file, u8 **result)
Definition: unix-misc.c:135
vec_validate
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment)
Definition: vec.h:523
os_get_thread_index
static_always_inline uword os_get_thread_index(void)
Definition: os.h:63
vec_free
#define vec_free(V)
Free vector's memory (no header).
Definition: vec.h:395
buf
u64 buf
Definition: application.c:493
n_bytes
u32 n_bytes
Definition: interface_output.c:401
n_left
u32 n_left
Definition: interface_output.c:1078
clib_error_return_unix
#define clib_error_return_unix(e, args...)
Definition: error.h:102
vec_resize
#define vec_resize(V, N)
Resize a vector (no header, unspecified alignment) Add N elements to end of given vector V,...
Definition: vec.h:296
u8
unsigned char u8
Definition: types.h:56
clib_error_t
Definition: clib_error.h:21
rv
int __clib_unused rv
Definition: application.c:491
unix.h
os_puts
void os_puts(u8 *string, uword string_length, uword is_error)
Definition: unix-misc.c:192
string
const char *const string
Definition: cJSON.h:172