1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2018 Intel Corporation.
3 * Copyright(c) 2012-2014 6WIND S.A.
4 */
5
6 #include <errno.h>
7 #include <limits.h>
8 #include <stddef.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <sys/stat.h>
13 #include <unistd.h>
14
15 #include <rte_log.h>
16
17 #include "eal_private.h"
18 #include "eal_filesystem.h"
19
eal_create_runtime_dir(void)20 int eal_create_runtime_dir(void)
21 {
22 const char *directory;
23 char run_dir[PATH_MAX];
24 char tmp[PATH_MAX];
25 int ret;
26
27 /* from RuntimeDirectory= see systemd.exec */
28 directory = getenv("RUNTIME_DIRECTORY");
29 if (directory == NULL) {
30 /*
31 * Used standard convention defined in
32 * XDG Base Directory Specification and
33 * Filesystem Hierarchy Standard.
34 */
35 if (getuid() == 0)
36 directory = "/var/run";
37 else
38 directory = getenv("XDG_RUNTIME_DIR") ? : "/tmp";
39 }
40
41 /* create DPDK subdirectory under runtime dir */
42 ret = snprintf(tmp, sizeof(tmp), "%s/dpdk", directory);
43 if (ret < 0 || ret == sizeof(tmp)) {
44 EAL_LOG(ERR, "Error creating DPDK runtime path name");
45 return -1;
46 }
47
48 /* create prefix-specific subdirectory under DPDK runtime dir */
49 ret = snprintf(run_dir, sizeof(run_dir), "%s/%s",
50 tmp, eal_get_hugefile_prefix());
51 if (ret < 0 || ret == sizeof(run_dir)) {
52 EAL_LOG(ERR, "Error creating prefix-specific runtime path name");
53 return -1;
54 }
55
56 /* create the path if it doesn't exist. no "mkdir -p" here, so do it
57 * step by step.
58 */
59 ret = mkdir(tmp, 0700);
60 if (ret < 0 && errno != EEXIST) {
61 EAL_LOG(ERR, "Error creating '%s': %s",
62 tmp, strerror(errno));
63 return -1;
64 }
65
66 ret = mkdir(run_dir, 0700);
67 if (ret < 0 && errno != EEXIST) {
68 EAL_LOG(ERR, "Error creating '%s': %s",
69 run_dir, strerror(errno));
70 return -1;
71 }
72
73 if (eal_set_runtime_dir(run_dir))
74 return -1;
75
76 return 0;
77 }
78
79 /* parse a sysfs (or other) file containing one integer value */
eal_parse_sysfs_value(const char * filename,unsigned long * val)80 int eal_parse_sysfs_value(const char *filename, unsigned long *val)
81 {
82 FILE *f;
83 char buf[BUFSIZ];
84 char *end = NULL;
85
86 if ((f = fopen(filename, "r")) == NULL) {
87 EAL_LOG(ERR, "%s(): cannot open sysfs value %s",
88 __func__, filename);
89 return -1;
90 }
91
92 if (fgets(buf, sizeof(buf), f) == NULL) {
93 EAL_LOG(ERR, "%s(): cannot read sysfs value %s",
94 __func__, filename);
95 fclose(f);
96 return -1;
97 }
98 *val = strtoul(buf, &end, 0);
99 if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
100 EAL_LOG(ERR, "%s(): cannot parse sysfs value %s",
101 __func__, filename);
102 fclose(f);
103 return -1;
104 }
105 fclose(f);
106 return 0;
107 }
108