BSD 4_3 development

[unix-history] / .ref-4f42a6a1ea1e02529aa6db238da5c5e1c488fad2 / usr / src / usr.bin / uucp / shio.c

#ifndef lint
static char sccsid[] = "@(#)shio.c      5.2 (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];
       extern int errno;

       if (fi == NULL)
               fi = DEVNULL;
       if (fo == NULL)
               fo = DEVNULL;

       DEBUG(3, "shio - %s\n", cmd);
#ifdef SIGCHLD
       signal(SIGCHLD, SIG_IGN);
#endif SIGCHLD
       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) {
                       logent(fi, "CAN'T READ");
                       exit(-errno);
               }
               close(1);
               f = creat(subfile(fo), 0666);
               if (f != 1) {
                       logent(fo, "CAN'T WRITE");
                       exit(-errno);
               }
               execl(SHELL, "sh", "-c", cmd, (char *)0);
               exit(100+errno);
       }
       while ((ret = wait(&status)) != pid && ret != -1)
               ;
       DEBUG(3, "status %d\n", status);
       return status;
}