Redid sysfs access to work outside of udev rule context
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rexy712
parent
5cfcf558ff
commit
e06b405b20
156
src/rex-edid.c
156
src/rex-edid.c
@ -22,6 +22,7 @@
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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#include <unistd.h>
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#define REX_EDID_VERSION_MAJ 0u
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#define REX_EDID_VERSION_MIN 2u
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@ -189,102 +190,103 @@ int rex_edid_xrandr(void){
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return 0;
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}
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/*get device name from DEVPATH environment variable and prepend '/sys' to it*/
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char* get_device_path(int* len){
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char* devpath;
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int length;
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char* tmp;
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/*udev stores the device location in sysfs in DEVPATH environment variable*/
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devpath = getenv("DEVPATH");
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if(!devpath)
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return NULL;
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length = strlen(devpath) + 5;
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tmp = malloc(length);
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if(!tmp)
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return NULL;
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tmp[length-1] = 0;
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snprintf(tmp, length, "/sys%s", devpath);
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if(len)
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*len = length-1;
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return tmp;
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}
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/*extract device name from the device path (the last part of the pathname)*/
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char* get_device_name(char* devpath, int strlength){
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int i;
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for(i = strlength-1;i >= 0;--i){
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if(devpath[i] == '/'){
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if(i == strlength)
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return NULL;
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return &(devpath[i])+1;
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}
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char** add_interface(char* str, size_t slen, char** list, size_t cap, size_t len){
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if(len >= cap){
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list = realloc(list, cap*2 * sizeof(char*));
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}
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return NULL;
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list[len] = malloc(slen+1);
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strncpy(list[len], str, slen);
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list[len][slen] = 0;
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return list;
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}
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void free_int_list(char** list, size_t len){
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for(size_t i = 0;i < len;++i)
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free(list[i]);
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free(list);
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}
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int rex_edid_sysfs(void){
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int devpath_len; /*length of device path name*/
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int devname_len; /*length of device name*/
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char* devpath; /*name of device path*/
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char* devname; /*name of the device*/
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char** dev_int_names = malloc(sizeof(char*)); /*name of device interfaces*/
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size_t num_names = 0;
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size_t names_size = 1;
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DIR* dp; /*pointer to open device directory in sysfs*/
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struct dirent* dir; /*accessor to sysfs directory*/
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/*set up device names*/
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devpath = get_device_path(&devpath_len);
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if(!devpath){
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fprintf(stderr, "DEVPATH is empty!\n");
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return -3;
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}
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devname = get_device_name(devpath, devpath_len);
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devname_len = strlen(devname);
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/*open directory*/
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dp = opendir(devpath);
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dp = opendir("/sys/class/drm");
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if(!dp){
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fprintf(stderr, "Unable to open DEVPATH!\n");
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fprintf(stderr, "Unable to open device path!\n");
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return -2;
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}
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/*check all contents of device directory*/
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while((dir = readdir(dp))){
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if(!strncmp(dir->d_name, devname, devname_len)){
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int edid_len; /*length of full path to edid file*/
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char* edid_file; /*buffer for edid path name*/
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unsigned char c; /*place to store char from file*/
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/*set up edid file path*/
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edid_len = strlen(dir->d_name)+1 + devpath_len + 6;
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edid_file = malloc(edid_len);
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snprintf(edid_file, edid_len, "%s/%s/edid", devpath, dir->d_name);
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printf("%s:", dir->d_name + devname_len+1);
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/*read in edid data from file*/
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FILE* fd = fopen(edid_file, "r");
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if(!fd){
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fprintf(stderr, "Unable to open edid file\n");
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free(edid_file);
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printf("\n");
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continue;
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if(!strncmp(dir->d_name, "card", 4)){
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size_t l = strlen(dir->d_name);
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int add = 1;
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for(size_t i = 4;i < l;++i){
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if(dir->d_name[i] == '-'){
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add = 0;
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}
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}
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c = fgetc(fd);
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while(!feof(fd)){
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printf("%02x", c);
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c = fgetc(fd);
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if(add){
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dev_int_names = add_interface(dir->d_name, l, dev_int_names, names_size, num_names);
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++num_names;
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}
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/*cleanup*/
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fclose(fd);
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free(edid_file);
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printf("\n");
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}
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}
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closedir(dp);
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free(devpath);
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chdir("/sys/class/drm");
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for(size_t i = 0;i < num_names;++i){
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devname = dev_int_names[i];
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devname_len = strlen(devname);
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/*open directory*/
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dp = opendir(devname);
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if(!dp){
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fprintf(stderr, "Unable to open %s!\n", devname);
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continue;
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}
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/*check all contents of device directory*/
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while((dir = readdir(dp))){
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if(!strncmp(dir->d_name, devname, devname_len)){
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int edid_len; /*length of full path to edid file*/
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char* edid_file; /*buffer for edid path name*/
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unsigned char c; /*place to store char from file*/
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/*set up edid file path*/
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edid_len = strlen(dir->d_name)+6;
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edid_file = malloc(edid_len);
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snprintf(edid_file, edid_len, "%s/edid", dir->d_name);
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printf("%s:", dir->d_name + devname_len+1);
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/*read in edid data from file*/
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FILE* fd = fopen(edid_file, "r");
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if(!fd){
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fprintf(stderr, "Unable to open edid file\n");
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free(edid_file);
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continue;
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}
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c = fgetc(fd);
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while(!feof(fd)){
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printf("%02x", c);
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c = fgetc(fd);
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}
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/*cleanup*/
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fclose(fd);
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free(edid_file);
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printf("\n");
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}
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}
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closedir(dp);
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}
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free_int_list(dev_int_names, num_names);
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return 0;
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}
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