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Annotation of embedaddon/tmux/compat/forkpty-aix.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
                      3:  *
                      4:  * Permission to use, copy, modify, and distribute this software for any
                      5:  * purpose with or without fee is hereby granted, provided that the above
                      6:  * copyright notice and this permission notice appear in all copies.
                      7:  *
                      8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                      9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     12:  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
                     13:  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
                     14:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     15:  */
                     16: 
                     17: #include <sys/types.h>
                     18: #include <sys/ioctl.h>
                     19: 
                     20: #include <fcntl.h>
                     21: #include <stdlib.h>
                     22: #include <stropts.h>
                     23: #include <unistd.h>
                     24: #include <errno.h>
                     25: 
                     26: #include "compat.h"
                     27: 
                     28: void fatal(const char *, ...);
                     29: void fatalx(const char *, ...);
                     30: 
                     31: pid_t
                     32: forkpty(int *master, unused char *name, struct termios *tio, struct winsize *ws)
                     33: {
                     34:        int     slave = -1, fd, pipe_fd[2];
                     35:        char   *path, dummy;
                     36:        pid_t   pid;
                     37: 
                     38:        if (pipe(pipe_fd) == -1)
                     39:                return (-1);
                     40: 
                     41:        if ((*master = open("/dev/ptc", O_RDWR|O_NOCTTY)) == -1)
                     42:                goto out;
                     43: 
                     44:        if ((path = ttyname(*master)) == NULL)
                     45:                goto out;
                     46: 
                     47:        if (name != NULL)
                     48:                strlcpy(name, path, TTY_NAME_MAX);
                     49: 
                     50:        if ((slave = open(path, O_RDWR|O_NOCTTY)) == -1)
                     51:                goto out;
                     52: 
                     53:        switch (pid = fork()) {
                     54:        case -1:
                     55:                goto out;
                     56:        case 0:
                     57:                close(*master);
                     58: 
                     59:                close(pipe_fd[1]);
                     60:                while (read(pipe_fd[0], &dummy, 1) == -1) {
                     61:                        if (errno != EINTR)
                     62:                                break;
                     63:                }
                     64:                close(pipe_fd[0]);
                     65: 
                     66:                fd = open(_PATH_TTY, O_RDWR|O_NOCTTY);
                     67:                if (fd >= 0) {
                     68:                        ioctl(fd, TIOCNOTTY, NULL);
                     69:                        close(fd);
                     70:                }
                     71: 
                     72:                if (setsid() < 0)
                     73:                        fatal("setsid");
                     74: 
                     75:                fd = open(_PATH_TTY, O_RDWR|O_NOCTTY);
                     76:                if (fd >= 0)
                     77:                        fatalx("open succeeded (failed to disconnect)");
                     78: 
                     79:                fd = open(path, O_RDWR);
                     80:                if (fd < 0)
                     81:                        fatal("open failed");
                     82:                close(fd);
                     83: 
                     84:                fd = open("/dev/tty", O_WRONLY);
                     85:                if (fd < 0)
                     86:                        fatal("open failed");
                     87:                close(fd);
                     88: 
                     89:                if (tio != NULL && tcsetattr(slave, TCSAFLUSH, tio) == -1)
                     90:                        fatal("tcsetattr failed");
                     91:                if (ioctl(slave, TIOCSWINSZ, ws) == -1)
                     92:                        fatal("ioctl failed");
                     93: 
                     94:                dup2(slave, 0);
                     95:                dup2(slave, 1);
                     96:                dup2(slave, 2);
                     97:                if (slave > 2)
                     98:                        close(slave);
                     99: 
                    100:                return (0);
                    101:        }
                    102: 
                    103:        close(slave);
                    104: 
                    105:        close(pipe_fd[0]);
                    106:        close(pipe_fd[1]);
                    107:        return (pid);
                    108: 
                    109: out:
                    110:        if (*master != -1)
                    111:                close(*master);
                    112:        if (slave != -1)
                    113:                close(slave);
                    114: 
                    115:        close(pipe_fd[0]);
                    116:        close(pipe_fd[1]);
                    117:        return (-1);
                    118: }