reading /proc throught C code

knobby67 · 09-17-2006, 06:27 AM

Hello, I'm hoping someone can help me out on this problem. I'm trying to read an entery from the proc system using C. Basically I'm using an io board which detects a switch. I can read at command promp using cat /proc/ioboard/input_1 which returns either a 1 or 0 depending on the status of the input. I've tried to read in throught c (the lang I'm coding in) using a simple
/***********code example******************/
input = open("/proc/ioboard/input_1",O_RDONLY);
printf("\n input = %d",input);
/*****************************************/

However this returns 3 no matter what the input, I assume I can't just read from /proc? Can anyone advise what I need to do. Thanks

jim mcnamara · 09-17-2006, 06:59 AM

Code:

#include <stdio.h>
int foo(void)
{
 char buf[32]={0x0};
 int value=0;
 FILE *fd=fopen("/proc/ioboard/input_1","r");
 fgets(buf,32,fd); 
 value=atoi(buf);
 printf("\n input = %d\n",value);
 fclose(fd);
 return value;
}

knobby67 · 09-17-2006, 07:16 AM

thanks, just realised I forgot to read

Sorry for the stupidity!