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Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 216 |
1 files changed, 216 insertions, 0 deletions
@@ -0,0 +1,216 @@ +/* + dtach - A simple program that emulates the detach feature of screen. + Copyright (C) 2001 Ned T. Crigler + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ +#include "detach.h" + +/* +** detach is a quick hack, since I wanted the detach feature of screen without +** all the other crud. It'll work best with full-screen applications, as it +** does not keep track of the screen or anything like that. +*/ + +// The program version +#define VERSION "0.3" + +// Make sure the binary has a copyright. +const char copyright[] = "dtach - version " VERSION " (C)Copyright 2001 Ned T. Crigler"; + +// argv[0] from the program +char *progname; +// The name of the passed in socket. +char *sockname; +// The character used for detaching. Defaults to '^\' +int detach_char = '\\' - 64; +// 1 if we should not interpret the suspend character. +int no_suspend; + +// The original terminal settings. Shared between the master and attach +// processes. The master uses it to initialize the pty, and the attacher uses +// it to restore the original settings. +struct termios orig_term; + +static void +usage() +{ + printf( + "dtach - version %s, compiled on %s at %s.\n" + "Usage: dtach -a <socket> <options>\n" + " dtach -A <socket> <options> <command...>\n" + " dtach -c <socket> <options> <command...>\n" + " dtach -n <socket> <options> <command...>\n" + "Modes:\n" + " -a\t\tAttach to the specified socket.\n" + " -A\t\tAttach to the specified socket, or create it if it\n" + "\t\t does not exist, running the specified command.\n" + " -c\t\tCreate a new socket and run the specified command.\n" + " -n\t\tCreate a new socket and run the specified command " + "detached.\n" + "Options:\n" + " -e <char>\tSet the detach character to <char>, defaults " + "to ^\\.\n" + " -E\t\tDisable the detach character.\n" + " -z\t\tInhibit processing of the suspend key.\n" + "\nReport any bugs to <crigler@hell-city.org>.\n", + VERSION, __DATE__, __TIME__); + exit(0); +} + +int +main(int argc, char **argv) +{ + int mode = 0; + + // Save the program name + progname = argv[0]; + ++argv; --argc; + + // Parse the arguments + if (argc >= 1 && **argv == '-') + { + if (strncmp(*argv, "--help", strlen(*argv)) == 0) + usage(); + else if (strncmp(*argv, "--version", strlen(*argv)) == 0) + { + printf("dtach - version %s, compiled on %s at %s.\n", + VERSION, __DATE__, __TIME__); + return 0; + } + + mode = argv[0][1]; + if (mode == '?') + usage(); + else if (mode != 'a' && mode != 'c' && mode != 'n' && + mode != 'A') + { + printf("%s: Invalid mode '-%c'\n", progname, mode); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + } + if (!mode) + { + printf("%s: No mode was specified.\n", progname); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + ++argv; --argc; + + if (argc < 1) + { + printf("%s: No socket was specified.\n", progname); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + sockname = *argv; + ++argv; --argc; + + while (argc >= 1 && **argv == '-') + { + char *p; + + for (p = argv[0] + 1; *p; ++p) + { + if (*p == 'E') + detach_char = -1; + else if (*p == 'z') + no_suspend = 1; + else if (*p == 'e') + { + ++argv; --argc; + if (argc < 1) + { + printf("%s: No escape character " + "specified.\n", progname); + printf("Try '%s -?' for more " + "information.\n", progname); + return 1; + } + if (argv[0][0] == '^' && argv[0][1]) + { + if (argv[0][1] == '?') + detach_char = '\177'; + else + detach_char = argv[0][1] - 64; + } + else + detach_char = argv[0][0]; + break; + } + else + { + printf("%s: Invalid option '-%c'\n", + progname, *p); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + } + ++argv; --argc; + } + + if (mode != 'a' && argc < 1) + { + printf("%s: No command was specified.\n", progname); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + + // Save the original terminal settings. + if (tcgetattr(0, &orig_term) < 0) + { + printf("%s: tcgetattr: %s\n", progname, strerror(errno)); + return 1; + } + + if (mode == 'a') + { + if (argc > 0) + { + printf("%s: Invalid number of arguments.\n", + progname); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + return attach_main(0); + } + else if (mode == 'n') + return master_main(argv); + else if (mode == 'c') + { + if (master_main(argv) != 0) + return 1; + return attach_main(0); + } + else if (mode == 'A') + { + // Try to attach first. If that doesn't work, create a new + // socket. + if (attach_main(1) != 0) + { + if (master_main(argv) != 0) + return 1; + return attach_main(0); + } + } + return 0; +} |