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Annotation of 42BSD/usr.bin/uucp/shio.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)shio.c     5.1 (Berkeley) 7/2/83";
        !             3: #endif
        !             4: 
        !             5: #include "uucp.h"
        !             6: #include <signal.h>
        !             7: 
        !             8: 
        !             9: /*******
        !            10:  *     shio(cmd, fi, fo, user) execute shell of command with
        !            11:  *     char *cmd, *fi, *fo;    fi and fo as standard input/output
        !            12:  *     char *user;             user name
        !            13:  *
        !            14:  *     return codes:
        !            15:  *             0  - ok
        !            16:  *             non zero -  failed  -  status from child
        !            17:  */
        !            18: 
        !            19: shio(cmd, fi, fo, user)
        !            20: char *cmd, *fi, *fo, *user;
        !            21: {
        !            22:        int status, f;
        !            23:        int uid, pid, ret;
        !            24:        char path[MAXFULLNAME];
        !            25: 
        !            26:        if (fi == NULL)
        !            27:                fi = "/dev/null";
        !            28:        if (fo == NULL)
        !            29:                fo = "/dev/null";
        !            30: 
        !            31:        DEBUG(3, "shio - %s\n", cmd);
        !            32:        if ((pid = fork()) == 0) {
        !            33:                signal(SIGINT, SIG_IGN);
        !            34:                signal(SIGHUP, SIG_IGN);
        !            35:                signal(SIGQUIT, SIG_IGN);
        !            36:                signal(SIGKILL, SIG_IGN);
        !            37:                close(Ifn);
        !            38:                close(Ofn);
        !            39:                close(0);
        !            40:                if (user == NULL
        !            41:                || (gninfo(user, &uid, path) != 0)
        !            42:                || setuid(uid))
        !            43:                        setuid(getuid());
        !            44:                f = open(subfile(fi), 0);
        !            45:                if (f != 0)
        !            46:                        exit(f);
        !            47:                close(1);
        !            48:                f = creat(subfile(fo), 0666);
        !            49:                if (f != 1)
        !            50:                        exit(f);
        !            51:                execl(SHELL, "sh", "-c", cmd, (char *)0);
        !            52:                exit(100);
        !            53:        }
        !            54:        while ((ret = wait(&status)) != pid && ret != -1);
        !            55:        DEBUG(3, "status %d\n", status);
        !            56:        return(status);
        !            57: }

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