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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
char *path;
char *brpath;
char *mbrpath;
char *cmd;
char *rcmd;
FILE *brf;
int setup_dir()
{
int r=mkdir(path,0755);
brpath=malloc(strlen(path)+12);
mbrpath=malloc(strlen(path)+16);
strcpy(brpath,path);
strcpy(mbrpath,path);
strcat(brpath,"/brightness");
strcat(mbrpath,"/max_brightness");
r|=mkfifo(brpath,0666);
FILE* mbrf=fopen(mbrpath,"w");
r|=(mbrf==NULL);
if(mbrf)fputs("100\n",mbrf);
fclose(mbrf);
return r;
}
void remove_dir()
{
unlink(brpath);
unlink(mbrpath);
rmdir(path);
free(brpath);
free(mbrpath);
}
void usage(char* s)
{
printf("usage: %s -c <cmd> -p <path>\n",s);
_exit(1);
}
int main(int argc,char **argv)
{
if(argc<5)usage(argv[0]);
for(int i=1;i<argc-1;++i)
{
if(!strcmp(argv[i],"-c"))cmd=strdup(argv[i+1]);
if(!strcmp(argv[i],"-p"))path=strdup(argv[i+1]);
}
if(!cmd||!path)
{
if(cmd)free(cmd);
if(path)free(path);
usage(argv[0]);
}
if(setup_dir())return puts("error setting up fake brightness interface"),1;
rcmd=malloc(strlen(cmd)+16);
while((brf=fopen(brpath,"r")))
{
char dat[64],*eptr;
eptr=fgets(dat,64,brf);//unused return value
int v=strtol(dat,&eptr,10),r;
if(eptr==dat)break;
snprintf(rcmd,strlen(cmd)+16,cmd,v);
if((r=system(rcmd)))
printf("%s returned %d\n",rcmd,r);
fclose(brf);
}
remove_dir();
free(path);
free(cmd);
free(rcmd);
return 0;
}
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