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Annotation of 43BSDReno/lib/libutil/pty.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21: static char sccsid[] = "@(#)pty.c      1.2 (Berkeley) 6/29/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <sys/file.h>
        !            25: #include <sys/ioctl.h>
        !            26: #include <termios.h>
        !            27: #include <grp.h>
        !            28: #include <errno.h>
        !            29: 
        !            30: openpty(amaster, aslave, name, termp, winp)
        !            31:        int *amaster, *aslave;
        !            32:        char *name;
        !            33:        struct termios *termp;
        !            34:        struct winsize *winp;
        !            35: {
        !            36:        register char *line = "/dev/ptyXX", *cp1, *cp2;
        !            37:        register master, slave, ruid, ttygid;
        !            38:        struct group *gr;
        !            39:        extern errno;
        !            40: 
        !            41:        if ((gr = getgrnam("tty")) != NULL)
        !            42:                ttygid = gr->gr_gid;
        !            43:        else
        !            44:                ttygid = -1;
        !            45:        ruid = getuid();
        !            46: 
        !            47:        for (cp1 = "pqrs"; *cp1; cp1++) {
        !            48:                line[8] = *cp1;
        !            49:                for (cp2 = "0123456789abcdef"; *cp2; cp2++) {
        !            50:                        line[9] = *cp2;
        !            51:                        if ((master = open(line, O_RDWR, 0)) == -1) {
        !            52:                                if (errno != EIO)
        !            53:                                        return (-1);    /* out of ptys */
        !            54:                        } else {
        !            55:                                line[5] = 't';
        !            56:                                (void) chown(line, ruid, ttygid);
        !            57:                                (void) chmod(line, 0620);
        !            58:                                (void) revoke(line);
        !            59:                                if ((slave = open(line, O_RDWR, 0)) != -1) {
        !            60:                                        *amaster = master;
        !            61:                                        *aslave = slave;
        !            62:                                        if (name)
        !            63:                                                strcpy(name, line);
        !            64:                                        if (termp)
        !            65:                                                (void) tcsetattr(slave, 
        !            66:                                                        TCSAFLUSH, &termp);
        !            67:                                        if (winp)
        !            68:                                                (void) ioctl(slave, TIOCSWINSZ, 
        !            69:                                                        (char *)&winp);
        !            70:                                        return (0);
        !            71:                                }
        !            72:                                (void) close(master);
        !            73:                                line[5] = 'p';
        !            74:                        }
        !            75:                }
        !            76:        }
        !            77:        errno = ENOENT; /* out of ptys */
        !            78:        return (-1);
        !            79: }
        !            80: 
        !            81: forkpty(amaster, name, termp, winp)
        !            82:        int *amaster;
        !            83:        char *name;
        !            84:        struct termios *termp;
        !            85:        struct winsize *winp;
        !            86: {
        !            87:        int master, slave, pid;
        !            88: 
        !            89:        if (openpty(&master, &slave, name, termp, winp) == -1)
        !            90:                return (-1);
        !            91:        switch (pid = fork()) {
        !            92:        case -1:
        !            93:                return (-1);
        !            94:        case 0:
        !            95:                /* 
        !            96:                 * child
        !            97:                 */
        !            98:                (void) close(master);
        !            99:                login_tty(slave);
        !           100:                return (0);
        !           101:        }
        !           102:        /*
        !           103:         * parent
        !           104:         */
        !           105:        *amaster = master;
        !           106:        (void) close(slave);
        !           107:        return (pid);
        !           108: }

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