File: usercheck.c

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#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>


/* check for whether caller is a specific uid (numeric) */

int
main(int argc, char *argv[])
{
    int             uid = 0;

    if (argc > 1)
	uid = atoi(argv[1]);

    exit(getuid() == uid ? 0 : 1);
}