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Annotation of src/usr.bin/tmux/pty.c, Revision 1.2

1.2     ! nicm        1: /* $OpenBSD: pty.c,v 1.1 2017/01/23 10:09:43 nicm Exp $ */
1.1       nicm        2:
                      3: /*
                      4:  * Copyright (c) 2017 Nicholas Marriott <nicholas.marriott@gmail.com>
                      5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
                      7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
                      9:  *
                     10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
                     15:  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
                     16:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     17:  */
                     18:
                     19: #include <sys/types.h>
                     20: #include <sys/ioctl.h>
                     21: #include <sys/time.h>
                     22: #include <sys/tty.h>
                     23:
                     24: #include <fcntl.h>
                     25: #include <string.h>
                     26: #include <termios.h>
                     27: #include <unistd.h>
                     28: #include <util.h>
                     29:
                     30: int    pty_open(int *);
                     31: pid_t  pty_fork(int, int *, char *, size_t, struct winsize *);
                     32:
                     33: int
                     34: pty_open(int *fd)
                     35: {
                     36:        *fd = open(PATH_PTMDEV, O_RDWR|O_CLOEXEC);
                     37:        if (*fd < 0)
                     38:            return (-1);
                     39:        return (0);
                     40: }
                     41:
                     42: pid_t
                     43: pty_fork(int ptmfd, int *fd, char *name, size_t namelen, struct winsize *ws)
                     44: {
                     45:        struct ptmget   ptm;
                     46:        pid_t           pid;
                     47:
1.2     ! nicm       48:        if (ioctl(ptmfd, PTMGET, &ptm) == -1)
1.1       nicm       49:                return (-1);
                     50:
                     51:        strlcpy(name, ptm.sn, namelen);
                     52:        ioctl(ptm.sfd, TIOCSWINSZ, ws);
                     53:
                     54:        switch (pid = fork()) {
                     55:        case -1:
                     56:                close(ptm.cfd);
                     57:                close(ptm.sfd);
                     58:                return (-1);
                     59:        case 0:
                     60:                close(ptm.cfd);
                     61:                login_tty(ptm.sfd);
                     62:                return (0);
                     63:        }
                     64:        *fd = ptm.cfd;
                     65:        close(ptm.sfd);
                     66:        return (pid);
                     67: }