Question

Possible Duplicate:
redirecting output to a file in C

I’m running a process as follows:

char* [NUM];
char[0] = processName;
char[1] = arg0;
...
char[NUM] = 0;
execv(args[0],args);

The question is how I can make it redirect its output to

/dev/null

I tried adding it to the args array but it sent it as arguments to the program…

Any idea anyone?

Thanks

Answer 1

First open the target you want, then close the fd you want to
reassign, use dup2 to connect it there, and close the previous open:

int tmpFd = open( "/dev/null", O_WRONLY );
if ( tmpFd == -1 ) {
    //  Real problem, couldn't open /dev/null
}
if ( dup2( tmpFd, 1 ) ) != 1 ) {
    //  Real problem, dup2 failed.
}
close( tmpFd );