648 lines
16 KiB
C
648 lines
16 KiB
C
/* Target-vector operations for controlling Unix child processes, for GDB.
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Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "frame.h" /* required by inferior.h */
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#include "inferior.h"
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#include "target.h"
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#include "wait.h"
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#include "gdbcore.h"
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#include "command.h"
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#include <signal.h>
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static void
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child_prepare_to_store PARAMS ((void));
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#ifndef CHILD_WAIT
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static int
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child_wait PARAMS ((int, struct target_waitstatus *));
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#endif /* CHILD_WAIT */
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static void
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child_open PARAMS ((char *, int));
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static void
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child_files_info PARAMS ((struct target_ops *));
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static void
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child_detach PARAMS ((char *, int));
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static void
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child_attach PARAMS ((char *, int));
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static void
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ptrace_me PARAMS ((void));
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static void
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ptrace_him PARAMS ((int));
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static void
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child_create_inferior PARAMS ((char *, char *, char **));
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static void
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child_mourn_inferior PARAMS ((void));
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static int
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child_can_run PARAMS ((void));
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extern char **environ;
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/* Forward declaration */
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extern struct target_ops child_ops;
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/* Convert host signal to our signals. */
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enum target_signal
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target_signal_from_host (hostsig)
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int hostsig;
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{
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/* A switch statement would make sense but would require special kludges
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to deal with the cases where more than one signal has the same number. */
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if (hostsig == 0) return TARGET_SIGNAL_0;
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#if defined (SIGHUP)
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if (hostsig == SIGHUP) return TARGET_SIGNAL_HUP;
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#endif
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#if defined (SIGINT)
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if (hostsig == SIGINT) return TARGET_SIGNAL_INT;
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#endif
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#if defined (SIGQUIT)
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if (hostsig == SIGQUIT) return TARGET_SIGNAL_QUIT;
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#endif
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#if defined (SIGILL)
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if (hostsig == SIGILL) return TARGET_SIGNAL_ILL;
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#endif
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#if defined (SIGTRAP)
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if (hostsig == SIGTRAP) return TARGET_SIGNAL_TRAP;
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#endif
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#if defined (SIGABRT)
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if (hostsig == SIGABRT) return TARGET_SIGNAL_ABRT;
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#endif
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#if defined (SIGEMT)
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if (hostsig == SIGEMT) return TARGET_SIGNAL_EMT;
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#endif
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#if defined (SIGFPE)
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if (hostsig == SIGFPE) return TARGET_SIGNAL_FPE;
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#endif
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#if defined (SIGKILL)
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if (hostsig == SIGKILL) return TARGET_SIGNAL_KILL;
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#endif
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#if defined (SIGBUS)
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if (hostsig == SIGBUS) return TARGET_SIGNAL_BUS;
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#endif
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#if defined (SIGSEGV)
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if (hostsig == SIGSEGV) return TARGET_SIGNAL_SEGV;
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#endif
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#if defined (SIGSYS)
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if (hostsig == SIGSYS) return TARGET_SIGNAL_SYS;
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#endif
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#if defined (SIGPIPE)
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if (hostsig == SIGPIPE) return TARGET_SIGNAL_PIPE;
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#endif
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#if defined (SIGALRM)
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if (hostsig == SIGALRM) return TARGET_SIGNAL_ALRM;
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#endif
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#if defined (SIGTERM)
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if (hostsig == SIGTERM) return TARGET_SIGNAL_TERM;
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#endif
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#if defined (SIGUSR1)
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if (hostsig == SIGUSR1) return TARGET_SIGNAL_USR1;
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#endif
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#if defined (SIGUSR2)
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if (hostsig == SIGUSR2) return TARGET_SIGNAL_USR2;
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#endif
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#if defined (SIGCLD)
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if (hostsig == SIGCLD) return TARGET_SIGNAL_CHLD;
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#endif
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#if defined (SIGCHLD)
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if (hostsig == SIGCHLD) return TARGET_SIGNAL_CHLD;
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#endif
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#if defined (SIGPWR)
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if (hostsig == SIGPWR) return TARGET_SIGNAL_PWR;
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#endif
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#if defined (SIGWINCH)
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if (hostsig == SIGWINCH) return TARGET_SIGNAL_WINCH;
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#endif
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#if defined (SIGURG)
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if (hostsig == SIGURG) return TARGET_SIGNAL_URG;
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#endif
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#if defined (SIGIO)
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if (hostsig == SIGIO) return TARGET_SIGNAL_IO;
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#endif
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#if defined (SIGPOLL)
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if (hostsig == SIGPOLL) return TARGET_SIGNAL_POLL;
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#endif
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#if defined (SIGSTOP)
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if (hostsig == SIGSTOP) return TARGET_SIGNAL_STOP;
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#endif
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#if defined (SIGTSTP)
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if (hostsig == SIGTSTP) return TARGET_SIGNAL_TSTP;
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#endif
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#if defined (SIGCONT)
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if (hostsig == SIGCONT) return TARGET_SIGNAL_CONT;
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#endif
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#if defined (SIGTTIN)
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if (hostsig == SIGTTIN) return TARGET_SIGNAL_TTIN;
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#endif
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#if defined (SIGTTOU)
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if (hostsig == SIGTTOU) return TARGET_SIGNAL_TTOU;
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#endif
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#if defined (SIGVTALRM)
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if (hostsig == SIGVTALRM) return TARGET_SIGNAL_VTALRM;
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#endif
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#if defined (SIGPROF)
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if (hostsig == SIGPROF) return TARGET_SIGNAL_PROF;
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#endif
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#if defined (SIGXCPU)
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if (hostsig == SIGXCPU) return TARGET_SIGNAL_XCPU;
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#endif
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#if defined (SIGXFSZ)
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if (hostsig == SIGXFSZ) return TARGET_SIGNAL_XFSZ;
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#endif
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#if defined (SIGWIND)
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if (hostsig == SIGWIND) return TARGET_SIGNAL_WIND;
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#endif
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#if defined (SIGPHONE)
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if (hostsig == SIGPHONE) return TARGET_SIGNAL_PHONE;
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#endif
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#if defined (SIGLOST)
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if (hostsig == SIGLOST) return TARGET_SIGNAL_LOST;
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#endif
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#if defined (SIGWAITING)
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if (hostsig == SIGWAITING) return TARGET_SIGNAL_WAITING;
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#endif
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#if defined (SIGLWP)
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if (hostsig == SIGLWP) return TARGET_SIGNAL_LWP;
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#endif
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#if defined (SIGDANGER)
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if (hostsig == SIGDANGER) return TARGET_SIGNAL_DANGER;
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#endif
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#if defined (SIGGRANT)
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if (hostsig == SIGGRANT) return TARGET_SIGNAL_GRANT;
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#endif
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#if defined (SIGRETRACT)
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if (hostsig == SIGRETRACT) return TARGET_SIGNAL_RETRACT;
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#endif
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#if defined (SIGMSG)
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if (hostsig == SIGMSG) return TARGET_SIGNAL_MSG;
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#endif
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#if defined (SIGSOUND)
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if (hostsig == SIGSOUND) return TARGET_SIGNAL_SOUND;
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#endif
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#if defined (SIGSAK)
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if (hostsig == SIGSAK) return TARGET_SIGNAL_SAK;
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#endif
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return TARGET_SIGNAL_UNKNOWN;
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}
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int
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target_signal_to_host (oursig)
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enum target_signal oursig;
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{
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switch (oursig)
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{
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case TARGET_SIGNAL_0: return 0;
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#if defined (SIGHUP)
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case TARGET_SIGNAL_HUP: return SIGHUP;
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#endif
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#if defined (SIGINT)
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case TARGET_SIGNAL_INT: return SIGINT;
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#endif
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#if defined (SIGQUIT)
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case TARGET_SIGNAL_QUIT: return SIGQUIT;
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#endif
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#if defined (SIGILL)
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case TARGET_SIGNAL_ILL: return SIGILL;
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#endif
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#if defined (SIGTRAP)
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case TARGET_SIGNAL_TRAP: return SIGTRAP;
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#endif
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#if defined (SIGABRT)
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case TARGET_SIGNAL_ABRT: return SIGABRT;
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#endif
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#if defined (SIGEMT)
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case TARGET_SIGNAL_EMT: return SIGEMT;
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#endif
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#if defined (SIGFPE)
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case TARGET_SIGNAL_FPE: return SIGFPE;
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#endif
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#if defined (SIGKILL)
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case TARGET_SIGNAL_KILL: return SIGKILL;
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#endif
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#if defined (SIGBUS)
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case TARGET_SIGNAL_BUS: return SIGBUS;
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#endif
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#if defined (SIGSEGV)
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case TARGET_SIGNAL_SEGV: return SIGSEGV;
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#endif
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#if defined (SIGSYS)
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case TARGET_SIGNAL_SYS: return SIGSYS;
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#endif
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#if defined (SIGPIPE)
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case TARGET_SIGNAL_PIPE: return SIGPIPE;
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#endif
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#if defined (SIGALRM)
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case TARGET_SIGNAL_ALRM: return SIGALRM;
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#endif
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#if defined (SIGTERM)
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case TARGET_SIGNAL_TERM: return SIGTERM;
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#endif
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#if defined (SIGUSR1)
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case TARGET_SIGNAL_USR1: return SIGUSR1;
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#endif
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#if defined (SIGUSR2)
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case TARGET_SIGNAL_USR2: return SIGUSR2;
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#endif
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#if defined (SIGCHLD) || defined (SIGCLD)
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case TARGET_SIGNAL_CHLD:
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#if defined (SIGCHLD)
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return SIGCHLD;
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#else
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return SIGCLD;
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#endif
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#endif /* SIGCLD or SIGCHLD */
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#if defined (SIGPWR)
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case TARGET_SIGNAL_PWR: return SIGPWR;
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#endif
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#if defined (SIGWINCH)
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case TARGET_SIGNAL_WINCH: return SIGWINCH;
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#endif
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#if defined (SIGURG)
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case TARGET_SIGNAL_URG: return SIGURG;
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#endif
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#if defined (SIGIO)
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case TARGET_SIGNAL_IO: return SIGIO;
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#endif
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#if defined (SIGPOLL)
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case TARGET_SIGNAL_POLL: return SIGPOLL;
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#endif
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#if defined (SIGSTOP)
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case TARGET_SIGNAL_STOP: return SIGSTOP;
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#endif
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#if defined (SIGTSTP)
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case TARGET_SIGNAL_TSTP: return SIGTSTP;
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#endif
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#if defined (SIGCONT)
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case TARGET_SIGNAL_CONT: return SIGCONT;
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#endif
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#if defined (SIGTTIN)
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case TARGET_SIGNAL_TTIN: return SIGTTIN;
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#endif
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#if defined (SIGTTOU)
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case TARGET_SIGNAL_TTOU: return SIGTTOU;
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#endif
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#if defined (SIGVTALRM)
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case TARGET_SIGNAL_VTALRM: return SIGVTALRM;
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#endif
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#if defined (SIGPROF)
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case TARGET_SIGNAL_PROF: return SIGPROF;
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#endif
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#if defined (SIGXCPU)
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case TARGET_SIGNAL_XCPU: return SIGXCPU;
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#endif
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#if defined (SIGXFSZ)
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case TARGET_SIGNAL_XFSZ: return SIGXFSZ;
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#endif
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#if defined (SIGWIND)
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case TARGET_SIGNAL_WIND: return SIGWIND;
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#endif
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#if defined (SIGPHONE)
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case TARGET_SIGNAL_PHONE: return SIGPHONE;
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#endif
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#if defined (SIGLOST)
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case TARGET_SIGNAL_LOST: return SIGLOST;
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#endif
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#if defined (SIGWAITING)
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case TARGET_SIGNAL_WAITING: return SIGWAITING;
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#endif
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#if defined (SIGLWP)
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case TARGET_SIGNAL_LWP: return SIGLWP;
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#endif
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#if defined (SIGDANGER)
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case TARGET_SIGNAL_DANGER: return SIGDANGER;
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#endif
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#if defined (SIGGRANT)
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case TARGET_SIGNAL_GRANT: return SIGGRANT;
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#endif
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#if defined (SIGRETRACT)
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case TARGET_SIGNAL_RETRACT: return SIGRETRACT;
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#endif
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#if defined (SIGMSG)
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case TARGET_SIGNAL_MSG: return SIGMSG;
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#endif
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#if defined (SIGSOUND)
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case TARGET_SIGNAL_SOUND: return SIGSOUND;
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#endif
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#if defined (SIGSAK)
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case TARGET_SIGNAL_SAK: return SIGSAK;
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#endif
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default:
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/* The user might be trying to do "signal SIGSAK" where this system
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doesn't have SIGSAK. */
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warning ("Signal %s does not exist on this system.\n",
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target_signal_to_name (oursig));
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return 0;
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}
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}
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/* Helper function for child_wait and the Lynx derivatives of child_wait.
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HOSTSTATUS is the waitstatus from wait() or the equivalent; store our
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translation of that in OURSTATUS. */
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void
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store_waitstatus (ourstatus, hoststatus)
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struct target_waitstatus *ourstatus;
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int hoststatus;
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{
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if (WIFEXITED (hoststatus))
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{
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ourstatus->kind = TARGET_WAITKIND_EXITED;
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ourstatus->value.integer = WEXITSTATUS (hoststatus);
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}
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else if (!WIFSTOPPED (hoststatus))
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{
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ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
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ourstatus->value.sig = target_signal_from_host (WTERMSIG (hoststatus));
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}
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else
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{
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ourstatus->kind = TARGET_WAITKIND_STOPPED;
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ourstatus->value.sig = target_signal_from_host (WSTOPSIG (hoststatus));
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}
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}
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#ifndef CHILD_WAIT
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/* Wait for child to do something. Return pid of child, or -1 in case
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of error; store status through argument pointer OURSTATUS. */
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static int
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child_wait (pid, ourstatus)
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int pid;
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struct target_waitstatus *ourstatus;
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{
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int save_errno;
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int status;
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do {
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if (attach_flag)
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set_sigint_trap(); /* Causes SIGINT to be passed on to the
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attached process. */
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pid = wait (&status);
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save_errno = errno;
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if (attach_flag)
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clear_sigint_trap();
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if (pid == -1)
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{
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if (save_errno == EINTR)
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continue;
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fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
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safe_strerror (save_errno));
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/* Claim it exited with unknown signal. */
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ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
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ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
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return -1;
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}
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} while (pid != inferior_pid); /* Some other child died or stopped */
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store_waitstatus (ourstatus, status);
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return pid;
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}
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#endif /* CHILD_WAIT */
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/* Attach to process PID, then initialize for debugging it. */
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static void
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child_attach (args, from_tty)
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char *args;
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int from_tty;
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{
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if (!args)
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error_no_arg ("process-id to attach");
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#ifndef ATTACH_DETACH
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error ("Can't attach to a process on this machine.");
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#else
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{
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char *exec_file;
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int pid;
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pid = atoi (args);
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if (pid == getpid()) /* Trying to masturbate? */
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error ("I refuse to debug myself!");
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if (from_tty)
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{
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exec_file = (char *) get_exec_file (0);
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if (exec_file)
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printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
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target_pid_to_str (pid));
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else
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printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
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gdb_flush (gdb_stdout);
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}
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attach (pid);
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inferior_pid = pid;
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push_target (&child_ops);
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}
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#endif /* ATTACH_DETACH */
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}
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/* Take a program previously attached to and detaches it.
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The program resumes execution and will no longer stop
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on signals, etc. We'd better not have left any breakpoints
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in the program or it'll die when it hits one. For this
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to work, it may be necessary for the process to have been
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previously attached. It *might* work if the program was
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started via the normal ptrace (PTRACE_TRACEME). */
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static void
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child_detach (args, from_tty)
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char *args;
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int from_tty;
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{
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#ifdef ATTACH_DETACH
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{
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int siggnal = 0;
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if (from_tty)
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{
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char *exec_file = get_exec_file (0);
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if (exec_file == 0)
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exec_file = "";
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printf_unfiltered ("Detaching from program: %s %s\n", exec_file,
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target_pid_to_str (inferior_pid));
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gdb_flush (gdb_stdout);
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}
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if (args)
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siggnal = atoi (args);
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detach (siggnal);
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inferior_pid = 0;
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unpush_target (&child_ops);
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}
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#else
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error ("This version of Unix does not support detaching a process.");
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#endif
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}
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/* Get ready to modify the registers array. On machines which store
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individual registers, this doesn't need to do anything. On machines
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which store all the registers in one fell swoop, this makes sure
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that registers contains all the registers from the program being
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debugged. */
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static void
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child_prepare_to_store ()
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{
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#ifdef CHILD_PREPARE_TO_STORE
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CHILD_PREPARE_TO_STORE ();
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#endif
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}
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/* Print status information about what we're accessing. */
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||
|
||
static void
|
||
child_files_info (ignore)
|
||
struct target_ops *ignore;
|
||
{
|
||
printf_unfiltered ("\tUsing the running image of %s %s.\n",
|
||
attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
child_open (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
error ("Use the \"run\" command to start a Unix child process.");
|
||
}
|
||
|
||
/* Stub function which causes the inferior that runs it, to be ptrace-able
|
||
by its parent process. */
|
||
|
||
static void
|
||
ptrace_me ()
|
||
{
|
||
/* "Trace me, Dr. Memory!" */
|
||
call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0);
|
||
}
|
||
|
||
/* Stub function which causes the GDB that runs it, to start ptrace-ing
|
||
the child process. */
|
||
|
||
static void
|
||
ptrace_him (pid)
|
||
int pid;
|
||
{
|
||
push_target (&child_ops);
|
||
|
||
#ifdef START_INFERIOR_TRAPS_EXPECTED
|
||
startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
|
||
#else
|
||
/* One trap to exec the shell, one to exec the program being debugged. */
|
||
startup_inferior (2);
|
||
#endif
|
||
}
|
||
|
||
/* Start an inferior Unix child process and sets inferior_pid to its pid.
|
||
EXEC_FILE is the file to run.
|
||
ALLARGS is a string containing the arguments to the program.
|
||
ENV is the environment vector to pass. Errors reported with error(). */
|
||
|
||
static void
|
||
child_create_inferior (exec_file, allargs, env)
|
||
char *exec_file;
|
||
char *allargs;
|
||
char **env;
|
||
{
|
||
fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him);
|
||
/* We are at the first instruction we care about. */
|
||
/* Pedal to the metal... */
|
||
proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
|
||
}
|
||
|
||
static void
|
||
child_mourn_inferior ()
|
||
{
|
||
unpush_target (&child_ops);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
static int
|
||
child_can_run ()
|
||
{
|
||
return(1);
|
||
}
|
||
|
||
struct target_ops child_ops = {
|
||
"child", /* to_shortname */
|
||
"Unix child process", /* to_longname */
|
||
"Unix child process (started by the \"run\" command).", /* to_doc */
|
||
child_open, /* to_open */
|
||
0, /* to_close */
|
||
child_attach, /* to_attach */
|
||
child_detach, /* to_detach */
|
||
child_resume, /* to_resume */
|
||
child_wait, /* to_wait */
|
||
fetch_inferior_registers, /* to_fetch_registers */
|
||
store_inferior_registers, /* to_store_registers */
|
||
child_prepare_to_store, /* to_prepare_to_store */
|
||
child_xfer_memory, /* to_xfer_memory */
|
||
child_files_info, /* to_files_info */
|
||
memory_insert_breakpoint, /* to_insert_breakpoint */
|
||
memory_remove_breakpoint, /* to_remove_breakpoint */
|
||
terminal_init_inferior, /* to_terminal_init */
|
||
terminal_inferior, /* to_terminal_inferior */
|
||
terminal_ours_for_output, /* to_terminal_ours_for_output */
|
||
terminal_ours, /* to_terminal_ours */
|
||
child_terminal_info, /* to_terminal_info */
|
||
kill_inferior, /* to_kill */
|
||
0, /* to_load */
|
||
0, /* to_lookup_symbol */
|
||
child_create_inferior, /* to_create_inferior */
|
||
child_mourn_inferior, /* to_mourn_inferior */
|
||
child_can_run, /* to_can_run */
|
||
0, /* to_notice_signals */
|
||
process_stratum, /* to_stratum */
|
||
0, /* to_next */
|
||
1, /* to_has_all_memory */
|
||
1, /* to_has_memory */
|
||
1, /* to_has_stack */
|
||
1, /* to_has_registers */
|
||
1, /* to_has_execution */
|
||
0, /* sections */
|
||
0, /* sections_end */
|
||
OPS_MAGIC /* to_magic */
|
||
};
|
||
|
||
void
|
||
_initialize_inftarg ()
|
||
{
|
||
add_target (&child_ops);
|
||
}
|