diff options
Diffstat (limited to 'src/vlib/unix/util.c')
| -rw-r--r-- | src/vlib/unix/util.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/src/vlib/unix/util.c b/src/vlib/unix/util.c new file mode 100644 index 00000000000..edc3e591baf --- /dev/null +++ b/src/vlib/unix/util.c @@ -0,0 +1,231 @@ +/* + * Copyright (c) 2016 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +/* + * pci.c: Linux user space PCI bus management. + * + * Copyright (c) 2008 Eliot Dresselhaus + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <dirent.h> + +clib_error_t * +foreach_directory_file (char *dir_name, + clib_error_t * (*f) (void *arg, u8 * path_name, + u8 * file_name), void *arg, + int scan_dirs) +{ + DIR *d; + struct dirent *e; + clib_error_t *error = 0; + u8 *s, *t; + + d = opendir (dir_name); + if (!d) + { + if (errno == ENOENT) + return 0; + return clib_error_return_unix (0, "open `%s'", dir_name); + } + + s = t = 0; + while (1) + { + e = readdir (d); + if (!e) + break; + if (scan_dirs) + { + if (e->d_type == DT_DIR + && (!strcmp (e->d_name, ".") || !strcmp (e->d_name, ".."))) + continue; + } + else + { + if (e->d_type == DT_DIR) + continue; + } + + s = format (s, "%s/%s", dir_name, e->d_name); + t = format (t, "%s", e->d_name); + error = f (arg, s, t); + _vec_len (s) = 0; + _vec_len (t) = 0; + + if (error) + break; + } + + vec_free (s); + closedir (d); + + return error; +} + +clib_error_t * +vlib_sysfs_write (char *file_name, char *fmt, ...) +{ + u8 *s; + int fd; + clib_error_t *error = 0; + + fd = open (file_name, O_WRONLY); + if (fd < 0) + return clib_error_return_unix (0, "open `%s'", file_name); + + va_list va; + va_start (va, fmt); + s = va_format (0, fmt, &va); + va_end (va); + + if (write (fd, s, vec_len (s)) < 0) + error = clib_error_return_unix (0, "write `%s'", file_name); + + vec_free (s); + close (fd); + return error; +} + +clib_error_t * +vlib_sysfs_read (char *file_name, char *fmt, ...) +{ + unformat_input_t input; + u8 *s = 0; + int fd; + ssize_t sz; + uword result; + + fd = open (file_name, O_RDONLY); + if (fd < 0) + return clib_error_return_unix (0, "open `%s'", file_name); + + vec_validate (s, 4095); + + sz = read (fd, s, vec_len (s)); + if (sz < 0) + { + close (fd); + vec_free (s); + return clib_error_return_unix (0, "read `%s'", file_name); + } + + _vec_len (s) = sz; + unformat_init_vector (&input, s); + + va_list va; + va_start (va, fmt); + result = va_unformat (&input, fmt, &va); + va_end (va); + + vec_free (s); + close (fd); + + if (result == 0) + return clib_error_return (0, "unformat error"); + + return 0; +} + +u8 * +vlib_sysfs_link_to_name (char *link) +{ + char *p, buffer[64]; + unformat_input_t in; + u8 *s = 0; + int r; + + r = readlink (link, buffer, sizeof (buffer) - 1); + + if (r < 0) + return 0; + + buffer[r] = 0; + p = strrchr (buffer, '/'); + + if (!p) + return 0; + + unformat_init_string (&in, p + 1, strlen (p + 1)); + if (unformat (&in, "%s", &s) != 1) + clib_unix_warning ("no string?"); + unformat_free (&in); + + return s; +} + +int +vlib_sysfs_get_free_hugepages (unsigned int numa_node, int page_size) +{ + struct stat sb; + u8 *p = 0; + int r = -1; + + p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0); + + if (stat ((char *) p, &sb) == 0) + { + if (S_ISDIR (sb.st_mode) == 0) + goto done; + } + else if (numa_node == 0) + { + vec_reset_length (p); + p = format (p, "/sys/kernel/mm%c", 0); + if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0) + goto done; + } + else + goto done; + + _vec_len (p) -= 1; + p = format (p, "/hugepages/hugepages-%ukB/free_hugepages%c", page_size, 0); + vlib_sysfs_read ((char *) p, "%d", &r); + +done: + vec_free (p); + return r; +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |