morpheus-base

morpheus base system
git clone git://git.2f30.org/morpheus-base.git
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dev.c (1034B)


      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 }