usr/src/usr.bin/uucp/shio.c

#ifndef lint
static char sccsid[] = "@(#)shio.c      5.1 (Berkeley) %G%";
#endif

#include "uucp.h"
#include <signal.h>


/*******
 *      shio(cmd, fi, fo, user) execute shell of command with
 *      char *cmd, *fi, *fo;    fi and fo as standard input/output
 *      char *user;             user name
 *
 *      return codes:
 *              0  - ok
 *              non zero -  failed  -  status from child
 */

shio(cmd, fi, fo, user)
char *cmd, *fi, *fo, *user;
{
        int status, f;
        int uid, pid, ret;
        char path[MAXFULLNAME];

        if (fi == NULL)
                fi = "/dev/null";
        if (fo == NULL)
                fo = "/dev/null";

        DEBUG(3, "shio - %s\n", cmd);
        if ((pid = fork()) == 0) {
                signal(SIGINT, SIG_IGN);
                signal(SIGHUP, SIG_IGN);
                signal(SIGQUIT, SIG_IGN);
                signal(SIGKILL, SIG_IGN);
                close(Ifn);
                close(Ofn);
                close(0);
                if (user == NULL
                || (gninfo(user, &uid, path) != 0)
                || setuid(uid))
                        setuid(getuid());
                f = open(subfile(fi), 0);
                if (f != 0)
                        exit(f);
                close(1);
                f = creat(subfile(fo), 0666);
                if (f != 1)
                        exit(f);
                execl(SHELL, "sh", "-c", cmd, (char *)0);
                exit(100);
        }
        while ((ret = wait(&status)) != pid && ret != -1);
        DEBUG(3, "status %d\n", status);
        return(status);
}