Run program in background.

[Reid Thompson]

Brian Dessent wrote:
> 
> If you just want your program to simply run in the
> background, launch it with a "&" at the end of the command
> from the shell.  However, if it expects to use stdout, stdin,
> or stderr, it will stop -- so these must all be redirected to files
> or pipes. 

not exactly correct the program does not stop, stdin is not accessible
via the shell, but stdout and stderr are by default, still routed to it.

$ cat back.c
#include <stdio.h>

int main (void)
{
    int ctr = 0;

    printf("From stdout\n");
    fprintf(stderr, "From stderr\n");

    for (ctr = 0; ctr < 5; ++ctr)
    {
        printf("%d\n", ctr);
        sleep(2);
    }

    return(0);
}
WS-XP-4960:/home/rthompso> 
$ ./a &
[2] 5076
WS-XP-4960:/home/rthompso> 
$ From stdout
From stderr
0
1
2
3
4
[2]+  Done                    ./a

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