dev.c - smdev - suckless mdev | |
git clone git://git.suckless.org/smdev | |
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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 } |