gdb/posix-hdep.c

   1 /* Host support routines for MinGW, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2006-2024 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "gdbsupport/event-loop.h"
  21 #include "gdbsupport/gdb_select.h"
  22 #include "inferior.h"
  23 #include <signal.h>
  24
  25 /* Wrapper for select.  Nothing special needed on POSIX platforms.  */
  26
  27 int
  28 gdb_select (int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
  29             struct timeval *timeout)
  30 {
  31   return select (n, readfds, writefds, exceptfds, timeout);
  32 }
  33
  34 /* Host-dependent console fputs method.  POSIX platforms always return
  35    zero, to use the default C 'fputs'.  */
  36 int
  37 gdb_console_fputs (const char *buf, FILE *f)
  38 {
  39   return 0;
  40 }
  41
  42 /* See inferior.h.  */
  43
  44 tribool
  45 sharing_input_terminal (int pid)
  46 {
  47   /* Using host-dependent code here is fine, because the
  48      child_terminal_foo functions are meant to be used by child/native
  49      targets.  */
  50 #if defined (__linux__) || defined (__sun__)
  51   char buf[100];
  52
  53   xsnprintf (buf, sizeof (buf), "/proc/%d/fd/0", pid);
  54   return is_gdb_terminal (buf);
  55 #else
  56   return TRIBOOL_UNKNOWN;
  57 #endif
  58 }
  59
  60 /* Current C-c handler.  */
  61 static c_c_handler_ftype *current_handler;
  62
  63 /* A wrapper that reinstalls the current signal handler.  */
  64 static void
  65 handler_wrapper (int num)
  66 {
  67   signal (num, handler_wrapper);
  68   if (current_handler != SIG_IGN)
  69     current_handler (num);
  70 }
  71
  72 /* See inferior.h.  */
  73
  74 c_c_handler_ftype *
  75 install_sigint_handler (c_c_handler_ftype *fn)
  76 {
  77   signal (SIGINT, handler_wrapper);
  78   c_c_handler_ftype *result = current_handler;
  79   current_handler = fn;
  80   return result;
  81 }