/* Generic serial interface routines Copyright 1992, 1993 Free Software Foundation, Inc. This file is part of GDB. 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 "defs.h" #include "serial.h" #include "gdb_string.h" /* Linked list of serial I/O handlers */ static struct serial_ops *serial_ops_list = NULL; /* This is the last serial stream opened. Used by connect command. */ static serial_t last_serial_opened = NULL; /* Pointer to list of scb's. */ static serial_t scb_base; static struct serial_ops * serial_interface_lookup (name) char *name; { struct serial_ops *ops; for (ops = serial_ops_list; ops; ops = ops->next) if (strcmp (name, ops->name) == 0) return ops; return NULL; } void serial_add_interface(optable) struct serial_ops *optable; { optable->next = serial_ops_list; serial_ops_list = optable; } /* Open up a device or a network socket, depending upon the syntax of NAME. */ serial_t serial_open (name) const char *name; { serial_t scb; struct serial_ops *ops; for (scb = scb_base; scb; scb = scb->next) if (scb->name && strcmp (scb->name, name) == 0) { scb->refcnt++; return scb; } if (strcmp (name, "pc") == 0) ops = serial_interface_lookup ("pc"); else if (strchr (name, ':')) ops = serial_interface_lookup ("tcp"); else ops = serial_interface_lookup ("hardwire"); if (!ops) return NULL; scb = (serial_t)xmalloc (sizeof (struct _serial_t)); scb->ops = ops; scb->bufcnt = 0; scb->bufp = scb->buf; if (scb->ops->open(scb, name)) { free (scb); return NULL; } scb->name = strsave (name); scb->next = scb_base; scb->refcnt = 1; scb_base = scb; last_serial_opened = scb; return scb; } serial_t serial_fdopen (fd) const int fd; { serial_t scb; struct serial_ops *ops; for (scb = scb_base; scb; scb = scb->next) if (scb->fd == fd) { scb->refcnt++; return scb; } ops = serial_interface_lookup ("hardwire"); if (!ops) return NULL; scb = (serial_t)xmalloc (sizeof (struct _serial_t)); scb->ops = ops; scb->bufcnt = 0; scb->bufp = scb->buf; scb->fd = fd; scb->name = NULL; scb->next = scb_base; scb->refcnt = 1; scb_base = scb; last_serial_opened = scb; return scb; } void serial_close(scb, really_close) serial_t scb; int really_close; { serial_t tmp_scb; last_serial_opened = NULL; /* This is bogus. It's not our fault if you pass us a bad scb...! Rob, you should fix your code instead. */ if (!scb) return; scb->refcnt--; if (scb->refcnt > 0) return; if (really_close) scb->ops->close (scb); if (scb->name) free (scb->name); if (scb_base == scb) scb_base = scb_base->next; else for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next) { if (tmp_scb->next != scb) continue; tmp_scb->next = tmp_scb->next->next; break; } free(scb); } #if 0 /* The connect command is #if 0 because I hadn't thought of an elegant way to wait for I/O on two serial_t's simultaneously. Two solutions came to mind: 1) Fork, and have have one fork handle the to user direction, and have the other hand the to target direction. This obviously won't cut it for MSDOS. 2) Use something like select. This assumes that stdin and the target side can both be waited on via the same mechanism. This may not be true for DOS, if GDB is talking to the target via a TCP socket. -grossman, 8 Jun 93 */ /* Connect the user directly to the remote system. This command acts just like the 'cu' or 'tip' command. Use ~. or ~^D to break out. */ static serial_t tty_desc; /* Controlling terminal */ static void cleanup_tty(ttystate) serial_ttystate ttystate; { printf_unfiltered ("\r\n[Exiting connect mode]\r\n"); SERIAL_SET_TTY_STATE (tty_desc, ttystate); free (ttystate); SERIAL_CLOSE (tty_desc); } static void connect_command (args, fromtty) char *args; int fromtty; { int c; char cur_esc = 0; serial_ttystate ttystate; serial_t port_desc; /* TTY port */ dont_repeat(); if (args) fprintf_unfiltered(gdb_stderr, "This command takes no args. They have been ignored.\n"); printf_unfiltered("[Entering connect mode. Use ~. or ~^D to escape]\n"); tty_desc = SERIAL_FDOPEN (0); port_desc = last_serial_opened; ttystate = SERIAL_GET_TTY_STATE (tty_desc); SERIAL_RAW (tty_desc); SERIAL_RAW (port_desc); make_cleanup (cleanup_tty, ttystate); while (1) { int mask; mask = SERIAL_WAIT_2 (tty_desc, port_desc, -1); if (mask & 2) { /* tty input */ char cx; while (1) { c = SERIAL_READCHAR(tty_desc, 0); if (c == SERIAL_TIMEOUT) break; if (c < 0) perror_with_name("connect"); cx = c; SERIAL_WRITE(port_desc, &cx, 1); switch (cur_esc) { case 0: if (c == '\r') cur_esc = c; break; case '\r': if (c == '~') cur_esc = c; else cur_esc = 0; break; case '~': if (c == '.' || c == '\004') return; else cur_esc = 0; } } } if (mask & 1) { /* Port input */ char cx; while (1) { c = SERIAL_READCHAR(port_desc, 0); if (c == SERIAL_TIMEOUT) break; if (c < 0) perror_with_name("connect"); cx = c; SERIAL_WRITE(tty_desc, &cx, 1); } } } } #endif /* 0 */ /* VARARGS */ void #ifdef ANSI_PROTOTYPES serial_printf (serial_t desc, const char *format, ...) #else serial_printf (va_alist) va_dcl #endif { va_list args; char *buf; #ifdef ANSI_PROTOTYPES va_start (args, format); #else serial_t desc; char *format; va_start (args); desc = va_arg (args, serial_t); format = va_arg (args, char *); #endif vasprintf (&buf, format, args); SERIAL_WRITE (desc, buf, strlen (buf)); free (buf); va_end (args); } void _initialize_serial () { #if 0 add_com ("connect", class_obscure, connect_command, "Connect the terminal directly up to the command monitor.\n\ Use ~. or ~^D to break out."); #endif /* 0 */ }