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dev.c (1034B)
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1 /* See LICENSE file for copyright and license details. */
2 #include <sys/stat.h>
3 #include <fcntl.h>
4 #include <unistd.h>
5 #include <limits.h>
6 #include <stdlib.h>
7 #include <stdio.h>
8 #include <string.h>
9 #include "../util.h"
10
11 /* read uevent file and set environment variables */
12 int
13 readuevent(const char *file)
14 {
15 FILE *fp;
16 int status = 0;
17 char buf[BUFSIZ];
18 char *p, *name, *value;
19
20 if(!(fp = fopen(file, "r")))
21 return -1;
22 while(!feof(fp)) {
23 fgets(buf, sizeof(buf) - 1, fp);
24 if(ferror(fp)) {
25 status = -2;
26 break;
27 }
28 if((p = strchr(buf, '\n')))
29 *p = '\0';
30 if(!(p = strchr(buf, '=')))
31 continue;
32 *p = '\0';
33 p++;
34 name = buf;
35 value = p;
36 setenv(name, value, 1);
37 }
38 fclose(fp);
39 return status;
40 }
41
42 /* `majmin' format is maj:min */
43 int
44 devtype(const char *majmin)
45 {
46 char path[PATH_MAX];
47
48 snprintf(path, sizeof(path), "/sys/dev/block/%s", majmin);
49 if (!access(path, F_OK))
50 return S_IFBLK;
51 snprintf(path, sizeof(path), "/sys/dev/char/%s", majmin);
52 if (!access(path, F_OK))
53 return S_IFCHR;
54 return -1;
55 }
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