gdb/posix-hdep.c

   1 /* Host support routines for MinGW, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2006-2023 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 "defs.h"
  21 #include "gdbsupport/event-loop.h"
  22 #include "gdbsupport/gdb_select.h"
  23 #include "inferior.h"
  24 #include <signal.h>
  25
  26 /* Wrapper for select.  Nothing special needed on POSIX platforms.  */
  27
  28 int
  29 gdb_select (int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
  30             struct timeval *timeout)
  31 {
  32   return select (n, readfds, writefds, exceptfds, timeout);
  33 }
  34
  35 /* Host-dependent console fputs method.  POSIX platforms always return
  36    zero, to use the default C 'fputs'.  */
  37 int
  38 gdb_console_fputs (const char *buf, FILE *f)
  39 {
  40   return 0;
  41 }
  42
  43 /* See inferior.h.  */
  44
  45 tribool
  46 sharing_input_terminal (int pid)
  47 {
  48   /* Using host-dependent code here is fine, because the
  49      child_terminal_foo functions are meant to be used by child/native
  50      targets.  */
  51 #if defined (__linux__) || defined (__sun__)
  52   char buf[100];
  53
  54   xsnprintf (buf, sizeof (buf), "/proc/%d/fd/0", pid);
  55   return is_gdb_terminal (buf);
  56 #else
  57   return TRIBOOL_UNKNOWN;
  58 #endif
  59 }
  60
  61 /* Current C-c handler.  */
  62 static c_c_handler_ftype *current_handler;
  63
  64 /* A wrapper that reinstalls the current signal handler.  */
  65 static void
  66 handler_wrapper (int num)
  67 {
  68   signal (num, handler_wrapper);
  69   if (current_handler != SIG_IGN)
  70     current_handler (num);
  71 }
  72
  73 /* See inferior.h.  */
  74
  75 c_c_handler_ftype *
  76 install_sigint_handler (c_c_handler_ftype *fn)
  77 {
  78   signal (SIGINT, handler_wrapper);
  79   c_c_handler_ftype *result = current_handler;
  80   current_handler = fn;
  81   return result;
  82 }