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Check return value of fscanf() #222

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Check return value of fscanf() #222

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6 changes: 3 additions & 3 deletions services/rc_battery_monitor/src/rc_battery_monitor.c
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Original file line number Diff line number Diff line change
Expand Up @@ -297,7 +297,7 @@ void shutdown_signal_handler(int signo)
int kill_existing_instance()
{
FILE* fd;
int old_pid, i;
int old_pid, r, i;

// attempt to open PID file
fd = fopen(BATTPIDFILE, "r");
Expand All @@ -308,12 +308,12 @@ int kill_existing_instance()
}

// otherwise try to read the current process ID
fscanf(fd,"%d", &old_pid);
r = fscanf(fd,"%d", &old_pid);
fclose(fd);

// if the file didn't contain a PID number, remove it and
// return -1 indicating weird behavior
if(old_pid == 0){
if(r != 1){
remove(BATTPIDFILE);
return 1;
}
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