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321 lines
11 KiB
C
321 lines
11 KiB
C
/* Remote serial support interface definitions for GDB, the GNU Debugger.
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Copyright (C) 1992-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef SERIAL_H
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#define SERIAL_H
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#ifdef USE_WIN32API
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#include <winsock2.h>
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#include <windows.h>
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#endif
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struct ui_file;
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/* For most routines, if a failure is indicated, then errno should be
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examined. */
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/* Terminal state pointer. This is specific to each type of
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interface. */
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typedef void *serial_ttystate;
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struct serial;
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struct serial_ops;
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/* Create a new serial for OPS. The new serial is not opened. */
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/* Try to open NAME. Returns a new `struct serial *' on success, NULL
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on failure. The new serial object has a reference count of 1.
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Note that some open calls can block and, if possible, should be
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written to be non-blocking, with calls to ui_look_hook so they can
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be cancelled. An async interface for open could be added to GDB if
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necessary. */
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extern struct serial *serial_open (const char *name);
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/* Open a new serial stream using OPS. */
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extern struct serial *serial_open_ops (const struct serial_ops *ops);
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/* Returns true if SCB is open. */
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extern int serial_is_open (struct serial *scb);
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/* Find an already opened serial stream using a file handle. */
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extern struct serial *serial_for_fd (int fd);
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/* Open a new serial stream using a file handle. */
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extern struct serial *serial_fdopen (const int fd);
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/* Push out all buffers, close the device and unref SCB. */
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extern void serial_close (struct serial *scb);
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/* Increment reference count of SCB. */
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extern void serial_ref (struct serial *scb);
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/* Decrement reference count of SCB. */
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extern void serial_unref (struct serial *scb);
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/* Create a pipe, and put the read end in FILDES[0], and the write end
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in FILDES[1]. Returns 0 for success, negative value for error (in
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which case errno contains the error). */
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extern int gdb_pipe (int fildes[2]);
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/* Create a pipe with each end wrapped in a `struct serial' interface.
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Put the read end in scbs[0], and the write end in scbs[1]. Returns
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0 for success, negative value for error (in which case errno
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contains the error). */
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extern int serial_pipe (struct serial *scbs[2]);
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/* Push out all buffers and destroy SCB without closing the device. */
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extern void serial_un_fdopen (struct serial *scb);
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/* Read one char from the serial device with TIMEOUT seconds to wait
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or -1 to wait forever. Use timeout of 0 to effect a poll.
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Infinite waits are not permitted. Returns unsigned char if ok, else
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one of the following codes. Note that all error return-codes are
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guaranteed to be < 0. */
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enum serial_rc {
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SERIAL_ERROR = -1, /* General error. */
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SERIAL_TIMEOUT = -2, /* Timeout or data-not-ready during read.
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Unfortunately, through
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deprecated_ui_loop_hook (), this can also
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be a QUIT indication. */
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SERIAL_EOF = -3 /* General end-of-file or remote target
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connection closed, indication. Includes
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things like the line dropping dead. */
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};
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extern int serial_readchar (struct serial *scb, int timeout);
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/* Write COUNT bytes from BUF to the port SCB. Returns 0 for
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success, non-zero for failure. */
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extern int serial_write (struct serial *scb, const void *buf, size_t count);
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/* Write a printf style string onto the serial port. */
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extern void serial_printf (struct serial *desc,
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const char *,...) ATTRIBUTE_PRINTF (2, 3);
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/* Allow pending output to drain. */
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extern int serial_drain_output (struct serial *);
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/* Flush (discard) pending output. Might also flush input (if this
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system can't flush only output). */
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extern int serial_flush_output (struct serial *);
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/* Flush pending input. Might also flush output (if this system can't
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flush only input). */
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extern int serial_flush_input (struct serial *);
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/* Send a break between 0.25 and 0.5 seconds long. */
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extern int serial_send_break (struct serial *scb);
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/* Turn the port into raw mode. */
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extern void serial_raw (struct serial *scb);
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/* Return a pointer to a newly malloc'd ttystate containing the state
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of the tty. */
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extern serial_ttystate serial_get_tty_state (struct serial *scb);
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/* Return a pointer to a newly malloc'd ttystate containing a copy
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of the state in TTYSTATE. */
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extern serial_ttystate serial_copy_tty_state (struct serial *scb,
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serial_ttystate ttystate);
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/* Set the state of the tty to TTYSTATE. The change is immediate.
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When changing to or from raw mode, input might be discarded.
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Returns 0 for success, negative value for error (in which case
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errno contains the error). */
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extern int serial_set_tty_state (struct serial *scb, serial_ttystate ttystate);
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/* printf_filtered a user-comprehensible description of ttystate on
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the specified STREAM. FIXME: At present this sends output to the
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default stream - GDB_STDOUT. */
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extern void serial_print_tty_state (struct serial *scb,
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serial_ttystate ttystate,
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struct ui_file *);
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/* Set the baudrate to the decimal value supplied. Returns 0 for
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success, -1 for failure. */
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extern int serial_setbaudrate (struct serial *scb, int rate);
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/* Set the number of stop bits to the value specified. Returns 0 for
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success, -1 for failure. */
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#define SERIAL_1_STOPBITS 1
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#define SERIAL_1_AND_A_HALF_STOPBITS 2 /* 1.5 bits, snicker... */
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#define SERIAL_2_STOPBITS 3
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extern int serial_setstopbits (struct serial *scb, int num);
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#define GDBPARITY_NONE 0
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#define GDBPARITY_ODD 1
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#define GDBPARITY_EVEN 2
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/* Set parity for serial port. Returns 0 for success, -1 for failure. */
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extern int serial_setparity (struct serial *scb, int parity);
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/* Asynchronous serial interface: */
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/* Can the serial device support asynchronous mode? */
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extern int serial_can_async_p (struct serial *scb);
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/* Has the serial device been put in asynchronous mode? */
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extern int serial_is_async_p (struct serial *scb);
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/* For ASYNC enabled devices, register a callback and enable
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asynchronous mode. To disable asynchronous mode, register a NULL
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callback. */
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typedef void (serial_event_ftype) (struct serial *scb, void *context);
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extern void serial_async (struct serial *scb,
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serial_event_ftype *handler, void *context);
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/* Trace/debug mechanism.
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serial_debug() enables/disables internal debugging.
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serial_debug_p() indicates the current debug state. */
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extern void serial_debug (struct serial *scb, int debug_p);
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extern int serial_debug_p (struct serial *scb);
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/* Details of an instance of a serial object. */
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struct serial
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{
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/* serial objects are ref counted (but not the underlying
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connection, just the object's lifetime in memory). */
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int refcnt;
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int fd; /* File descriptor */
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/* File descriptor for a separate error stream that should be
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immediately forwarded to gdb_stderr. This may be -1.
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If != -1, this descriptor should be non-blocking or
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ops->avail should be non-NULL. */
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int error_fd;
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const struct serial_ops *ops; /* Function vector */
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void *state; /* Local context info for open FD */
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serial_ttystate ttystate; /* Not used (yet) */
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int bufcnt; /* Amount of data remaining in receive
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buffer. -ve for sticky errors. */
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unsigned char *bufp; /* Current byte */
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unsigned char buf[BUFSIZ]; /* Da buffer itself */
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struct serial *next; /* Pointer to the next `struct serial *' */
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int debug_p; /* Trace this serial devices operation. */
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int async_state; /* Async internal state. */
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void *async_context; /* Async event thread's context */
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serial_event_ftype *async_handler;/* Async event handler */
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};
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struct serial_ops
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{
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const char *name;
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int (*open) (struct serial *, const char *name);
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void (*close) (struct serial *);
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int (*fdopen) (struct serial *, int fd);
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int (*readchar) (struct serial *, int timeout);
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int (*write) (struct serial *, const void *buf, size_t count);
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/* Discard pending output */
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int (*flush_output) (struct serial *);
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/* Discard pending input */
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int (*flush_input) (struct serial *);
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int (*send_break) (struct serial *);
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void (*go_raw) (struct serial *);
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serial_ttystate (*get_tty_state) (struct serial *);
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serial_ttystate (*copy_tty_state) (struct serial *, serial_ttystate);
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int (*set_tty_state) (struct serial *, serial_ttystate);
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void (*print_tty_state) (struct serial *, serial_ttystate,
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struct ui_file *);
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int (*setbaudrate) (struct serial *, int rate);
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int (*setstopbits) (struct serial *, int num);
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/* Set the value PARITY as parity setting for serial object.
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Return 0 in the case of success. */
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int (*setparity) (struct serial *, int parity);
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/* Wait for output to drain. */
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int (*drain_output) (struct serial *);
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/* Change the serial device into/out of asynchronous mode, call
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the specified function when ever there is something
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interesting. */
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void (*async) (struct serial *scb, int async_p);
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/* Perform a low-level read operation, reading (at most) COUNT
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bytes into SCB->BUF. Return zero at end of file. */
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int (*read_prim)(struct serial *scb, size_t count);
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/* Perform a low-level write operation, writing (at most) COUNT
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bytes from BUF. */
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int (*write_prim)(struct serial *scb, const void *buf, size_t count);
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/* Return that number of bytes that can be read from FD
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without blocking. Return value of -1 means that the
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read will not block even if less that requested bytes
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are available. */
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int (*avail)(struct serial *scb, int fd);
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#ifdef USE_WIN32API
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/* Return a handle to wait on, indicating available data from SCB
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when signaled, in *READ. Return a handle indicating errors
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in *EXCEPT. */
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void (*wait_handle) (struct serial *scb, HANDLE *read, HANDLE *except);
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void (*done_wait_handle) (struct serial *scb);
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#endif /* USE_WIN32API */
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};
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/* Add a new serial interface to the interface list. */
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extern void serial_add_interface (const struct serial_ops * optable);
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/* File in which to record the remote debugging session. */
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extern void serial_log_command (struct target_ops *self, const char *);
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#ifdef USE_WIN32API
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/* Windows-only: find or create handles that we can wait on for this
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serial device. */
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extern void serial_wait_handle (struct serial *, HANDLE *, HANDLE *);
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/* Windows-only: signal that we are done with the wait handles. */
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extern void serial_done_wait_handle (struct serial *);
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#endif /* USE_WIN32API */
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#endif /* SERIAL_H */
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