mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-21 04:42:53 +08:00
268a13a5a3
This is the next patch in the ongoing series to move gdbsever to the top level. This patch just renames the "common" directory. The idea is to do this move in two parts: first rename the directory (this patch), then move the directory to the top. This approach makes the patches a bit more tractable. I chose the name "gdbsupport" for the directory. However, as this patch was largely written by sed, we could pick a new name without too much difficulty. Tested by the buildbot. gdb/ChangeLog 2019-07-09 Tom Tromey <tom@tromey.com> * contrib/ari/gdb_ari.sh: Change common to gdbsupport. * configure: Rebuild. * configure.ac: Change common to gdbsupport. * gdbsupport: Rename from common. * acinclude.m4: Change common to gdbsupport. * Makefile.in (CONFIG_SRC_SUBDIR, COMMON_SFILES) (HFILES_NO_SRCDIR, stamp-version, ALLDEPFILES): Change common to gdbsupport. * aarch64-tdep.c, ada-lang.c, ada-lang.h, agent.c, alloc.c, amd64-darwin-tdep.c, amd64-dicos-tdep.c, amd64-fbsd-nat.c, amd64-fbsd-tdep.c, amd64-linux-nat.c, amd64-linux-tdep.c, amd64-nbsd-tdep.c, amd64-obsd-tdep.c, amd64-sol2-tdep.c, amd64-tdep.c, amd64-windows-tdep.c, arch-utils.c, arch/aarch64-insn.c, arch/aarch64.c, arch/aarch64.h, arch/amd64.c, arch/amd64.h, arch/arm-get-next-pcs.c, arch/arm-linux.c, arch/arm.c, arch/i386.c, arch/i386.h, arch/ppc-linux-common.c, arch/riscv.c, arch/riscv.h, arch/tic6x.c, arm-tdep.c, auto-load.c, auxv.c, ax-gdb.c, ax-general.c, ax.h, breakpoint.c, breakpoint.h, btrace.c, btrace.h, build-id.c, build-id.h, c-lang.h, charset.c, charset.h, cli/cli-cmds.c, cli/cli-cmds.h, cli/cli-decode.c, cli/cli-dump.c, cli/cli-option.h, cli/cli-script.c, coff-pe-read.c, command.h, compile/compile-c-support.c, compile/compile-c.h, compile/compile-cplus-symbols.c, compile/compile-cplus-types.c, compile/compile-cplus.h, compile/compile-loc2c.c, compile/compile.c, completer.c, completer.h, contrib/ari/gdb_ari.sh, corefile.c, corelow.c, cp-support.c, cp-support.h, cp-valprint.c, csky-tdep.c, ctf.c, darwin-nat.c, debug.c, defs.h, disasm-selftests.c, disasm.c, disasm.h, dtrace-probe.c, dwarf-index-cache.c, dwarf-index-cache.h, dwarf-index-write.c, dwarf2-frame.c, dwarf2expr.c, dwarf2loc.c, dwarf2read.c, event-loop.c, event-top.c, exceptions.c, exec.c, extension.h, fbsd-nat.c, features/aarch64-core.c, features/aarch64-fpu.c, features/aarch64-pauth.c, features/aarch64-sve.c, features/i386/32bit-avx.c, features/i386/32bit-avx512.c, features/i386/32bit-core.c, features/i386/32bit-linux.c, features/i386/32bit-mpx.c, features/i386/32bit-pkeys.c, features/i386/32bit-segments.c, features/i386/32bit-sse.c, features/i386/64bit-avx.c, features/i386/64bit-avx512.c, features/i386/64bit-core.c, features/i386/64bit-linux.c, features/i386/64bit-mpx.c, features/i386/64bit-pkeys.c, features/i386/64bit-segments.c, features/i386/64bit-sse.c, features/i386/x32-core.c, features/riscv/32bit-cpu.c, features/riscv/32bit-csr.c, features/riscv/32bit-fpu.c, features/riscv/64bit-cpu.c, features/riscv/64bit-csr.c, features/riscv/64bit-fpu.c, features/tic6x-c6xp.c, features/tic6x-core.c, features/tic6x-gp.c, filename-seen-cache.h, findcmd.c, findvar.c, fork-child.c, gcore.c, gdb_bfd.c, gdb_bfd.h, gdb_proc_service.h, gdb_regex.c, gdb_select.h, gdb_usleep.c, gdbarch-selftests.c, gdbthread.h, gdbtypes.h, gnu-nat.c, go32-nat.c, guile/guile.c, guile/scm-ports.c, guile/scm-safe-call.c, guile/scm-type.c, i386-fbsd-nat.c, i386-fbsd-tdep.c, i386-go32-tdep.c, i386-linux-nat.c, i386-linux-tdep.c, i386-tdep.c, i387-tdep.c, ia64-libunwind-tdep.c, ia64-linux-nat.c, inf-child.c, inf-ptrace.c, infcall.c, infcall.h, infcmd.c, inferior-iter.h, inferior.c, inferior.h, inflow.c, inflow.h, infrun.c, infrun.h, inline-frame.c, language.h, linespec.c, linux-fork.c, linux-nat.c, linux-tdep.c, linux-thread-db.c, location.c, machoread.c, macrotab.h, main.c, maint.c, maint.h, memattr.c, memrange.h, mi/mi-cmd-break.h, mi/mi-cmd-env.c, mi/mi-cmd-stack.c, mi/mi-cmd-var.c, mi/mi-interp.c, mi/mi-main.c, mi/mi-parse.h, minsyms.c, mips-linux-tdep.c, namespace.h, nat/aarch64-linux-hw-point.c, nat/aarch64-linux-hw-point.h, nat/aarch64-linux.c, nat/aarch64-sve-linux-ptrace.c, nat/amd64-linux-siginfo.c, nat/fork-inferior.c, nat/linux-btrace.c, nat/linux-btrace.h, nat/linux-namespaces.c, nat/linux-nat.h, nat/linux-osdata.c, nat/linux-personality.c, nat/linux-procfs.c, nat/linux-ptrace.c, nat/linux-ptrace.h, nat/linux-waitpid.c, nat/mips-linux-watch.c, nat/mips-linux-watch.h, nat/ppc-linux.c, nat/x86-dregs.c, nat/x86-dregs.h, nat/x86-linux-dregs.c, nat/x86-linux.c, nto-procfs.c, nto-tdep.c, objfile-flags.h, objfiles.c, objfiles.h, obsd-nat.c, observable.h, osdata.c, p-valprint.c, parse.c, parser-defs.h, ppc-linux-nat.c, printcmd.c, probe.c, proc-api.c, procfs.c, producer.c, progspace.h, psymtab.h, python/py-framefilter.c, python/py-inferior.c, python/py-ref.h, python/py-type.c, python/python.c, record-btrace.c, record-full.c, record.c, record.h, regcache-dump.c, regcache.c, regcache.h, remote-fileio.c, remote-fileio.h, remote-sim.c, remote.c, riscv-tdep.c, rs6000-aix-tdep.c, rust-exp.y, s12z-tdep.c, selftest-arch.c, ser-base.c, ser-event.c, ser-pipe.c, ser-tcp.c, ser-unix.c, skip.c, solib-aix.c, solib-target.c, solib.c, source-cache.c, source.c, source.h, sparc-nat.c, spu-linux-nat.c, stack.c, stap-probe.c, symfile-add-flags.h, symfile.c, symfile.h, symtab.c, symtab.h, target-descriptions.c, target-descriptions.h, target-memory.c, target.c, target.h, target/waitstatus.c, target/waitstatus.h, thread-iter.h, thread.c, tilegx-tdep.c, top.c, top.h, tracefile-tfile.c, tracefile.c, tracepoint.c, tracepoint.h, tui/tui-io.c, ui-file.c, ui-out.h, unittests/array-view-selftests.c, unittests/child-path-selftests.c, unittests/cli-utils-selftests.c, unittests/common-utils-selftests.c, unittests/copy_bitwise-selftests.c, unittests/environ-selftests.c, unittests/format_pieces-selftests.c, unittests/function-view-selftests.c, unittests/lookup_name_info-selftests.c, unittests/memory-map-selftests.c, unittests/memrange-selftests.c, unittests/mkdir-recursive-selftests.c, unittests/observable-selftests.c, unittests/offset-type-selftests.c, unittests/optional-selftests.c, unittests/parse-connection-spec-selftests.c, unittests/ptid-selftests.c, unittests/rsp-low-selftests.c, unittests/scoped_fd-selftests.c, unittests/scoped_mmap-selftests.c, unittests/scoped_restore-selftests.c, unittests/string_view-selftests.c, unittests/style-selftests.c, unittests/tracepoint-selftests.c, unittests/unpack-selftests.c, unittests/utils-selftests.c, unittests/xml-utils-selftests.c, utils.c, utils.h, valarith.c, valops.c, valprint.c, value.c, value.h, varobj.c, varobj.h, windows-nat.c, x86-linux-nat.c, xml-support.c, xml-support.h, xml-tdesc.h, xstormy16-tdep.c, xtensa-linux-nat.c, dwarf2read.h: Change common to gdbsupport. gdb/gdbserver/ChangeLog 2019-07-09 Tom Tromey <tom@tromey.com> * configure: Rebuild. * configure.ac: Change common to gdbsupport. * acinclude.m4: Change common to gdbsupport. * Makefile.in (SFILES, OBS, GDBREPLAY_OBS, IPA_OBJS) (version-generated.c, gdbsupport/%-ipa.o, gdbsupport/%.o): Change common to gdbsupport. * ax.c, event-loop.c, fork-child.c, gdb_proc_service.h, gdbreplay.c, gdbthread.h, hostio-errno.c, hostio.c, i387-fp.c, inferiors.c, inferiors.h, linux-aarch64-tdesc-selftest.c, linux-amd64-ipa.c, linux-i386-ipa.c, linux-low.c, linux-tic6x-low.c, linux-x86-low.c, linux-x86-tdesc-selftest.c, linux-x86-tdesc.c, lynx-i386-low.c, lynx-low.c, mem-break.h, nto-x86-low.c, regcache.c, regcache.h, remote-utils.c, server.c, server.h, spu-low.c, symbol.c, target.h, tdesc.c, tdesc.h, thread-db.c, tracepoint.c, win32-i386-low.c, win32-low.c: Change common to gdbsupport.
598 lines
17 KiB
C
598 lines
17 KiB
C
/* Fork a Unix child process, and set up to debug it, for GDB and GDBserver.
|
|
|
|
Copyright (C) 1990-2019 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 3 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "gdbsupport/common-defs.h"
|
|
#include "fork-inferior.h"
|
|
#include "target/waitstatus.h"
|
|
#include "gdbsupport/filestuff.h"
|
|
#include "target/target.h"
|
|
#include "gdbsupport/common-inferior.h"
|
|
#include "gdbsupport/common-gdbthread.h"
|
|
#include "gdbsupport/pathstuff.h"
|
|
#include "gdbsupport/signals-state-save-restore.h"
|
|
#include "gdbsupport/gdb_tilde_expand.h"
|
|
#include <vector>
|
|
|
|
extern char **environ;
|
|
|
|
/* Build the argument vector for execv(3). */
|
|
|
|
class execv_argv
|
|
{
|
|
public:
|
|
/* EXEC_FILE is the file to run. ALLARGS is a string containing the
|
|
arguments to the program. If starting with a shell, SHELL_FILE
|
|
is the shell to run. Otherwise, SHELL_FILE is NULL. */
|
|
execv_argv (const char *exec_file, const std::string &allargs,
|
|
const char *shell_file);
|
|
|
|
/* Return a pointer to the built argv, in the type expected by
|
|
execv. The result is (only) valid for as long as this execv_argv
|
|
object is live. We return a "char **" because that's the type
|
|
that the execv functions expect. Note that it is guaranteed that
|
|
the execv functions do not modify the argv[] array nor the
|
|
strings to which the array point. */
|
|
char **argv ()
|
|
{
|
|
return const_cast<char **> (&m_argv[0]);
|
|
}
|
|
|
|
private:
|
|
DISABLE_COPY_AND_ASSIGN (execv_argv);
|
|
|
|
/* Helper methods for constructing the argument vector. */
|
|
|
|
/* Used when building an argv for a straight execv call, without
|
|
going via the shell. */
|
|
void init_for_no_shell (const char *exec_file,
|
|
const std::string &allargs);
|
|
|
|
/* Used when building an argv for execing a shell that execs the
|
|
child program. */
|
|
void init_for_shell (const char *exec_file,
|
|
const std::string &allargs,
|
|
const char *shell_file);
|
|
|
|
/* The argument vector built. Holds non-owning pointers. Elements
|
|
either point to the strings passed to the execv_argv ctor, or
|
|
inside M_STORAGE. */
|
|
std::vector<const char *> m_argv;
|
|
|
|
/* Storage. In the no-shell case, this contains a copy of the
|
|
arguments passed to the ctor, split by '\0'. In the shell case,
|
|
this contains the quoted shell command. I.e., SHELL_COMMAND in
|
|
{"$SHELL" "-c", SHELL_COMMAND, NULL}. */
|
|
std::string m_storage;
|
|
};
|
|
|
|
/* Create argument vector for straight call to execvp. Breaks up
|
|
ALLARGS into an argument vector suitable for passing to execvp and
|
|
stores it in M_ARGV. E.g., on "run a b c d" this routine would get
|
|
as input the string "a b c d", and as output it would fill in
|
|
M_ARGV with the four arguments "a", "b", "c", "d". Each argument
|
|
in M_ARGV points to a substring of a copy of ALLARGS stored in
|
|
M_STORAGE. */
|
|
|
|
void
|
|
execv_argv::init_for_no_shell (const char *exec_file,
|
|
const std::string &allargs)
|
|
{
|
|
|
|
/* Save/work with a copy stored in our storage. The pointers pushed
|
|
to M_ARGV point directly into M_STORAGE, which is modified in
|
|
place with the necessary NULL terminators. This avoids N heap
|
|
allocations and string dups when 1 is sufficient. */
|
|
std::string &args_copy = m_storage = allargs;
|
|
|
|
m_argv.push_back (exec_file);
|
|
|
|
for (size_t cur_pos = 0; cur_pos < args_copy.size ();)
|
|
{
|
|
/* Skip whitespace-like chars. */
|
|
std::size_t pos = args_copy.find_first_not_of (" \t\n", cur_pos);
|
|
|
|
if (pos != std::string::npos)
|
|
cur_pos = pos;
|
|
|
|
/* Find the position of the next separator. */
|
|
std::size_t next_sep = args_copy.find_first_of (" \t\n", cur_pos);
|
|
|
|
if (next_sep == std::string::npos)
|
|
{
|
|
/* No separator found, which means this is the last
|
|
argument. */
|
|
next_sep = args_copy.size ();
|
|
}
|
|
else
|
|
{
|
|
/* Replace the separator with a terminator. */
|
|
args_copy[next_sep++] = '\0';
|
|
}
|
|
|
|
m_argv.push_back (&args_copy[cur_pos]);
|
|
|
|
cur_pos = next_sep;
|
|
}
|
|
|
|
/* NULL-terminate the vector. */
|
|
m_argv.push_back (NULL);
|
|
}
|
|
|
|
/* When executing a command under the given shell, return true if the
|
|
'!' character should be escaped when embedded in a quoted
|
|
command-line argument. */
|
|
|
|
static bool
|
|
escape_bang_in_quoted_argument (const char *shell_file)
|
|
{
|
|
size_t shell_file_len = strlen (shell_file);
|
|
|
|
/* Bang should be escaped only in C Shells. For now, simply check
|
|
that the shell name ends with 'csh', which covers at least csh
|
|
and tcsh. This should be good enough for now. */
|
|
|
|
if (shell_file_len < 3)
|
|
return false;
|
|
|
|
if (shell_file[shell_file_len - 3] == 'c'
|
|
&& shell_file[shell_file_len - 2] == 's'
|
|
&& shell_file[shell_file_len - 1] == 'h')
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* See declaration. */
|
|
|
|
execv_argv::execv_argv (const char *exec_file,
|
|
const std::string &allargs,
|
|
const char *shell_file)
|
|
{
|
|
if (shell_file == NULL)
|
|
init_for_no_shell (exec_file, allargs);
|
|
else
|
|
init_for_shell (exec_file, allargs, shell_file);
|
|
}
|
|
|
|
/* See declaration. */
|
|
|
|
void
|
|
execv_argv::init_for_shell (const char *exec_file,
|
|
const std::string &allargs,
|
|
const char *shell_file)
|
|
{
|
|
const char *exec_wrapper = get_exec_wrapper ();
|
|
|
|
/* We're going to call a shell. */
|
|
bool escape_bang = escape_bang_in_quoted_argument (shell_file);
|
|
|
|
/* We need to build a new shell command string, and make argv point
|
|
to it. So build it in the storage. */
|
|
std::string &shell_command = m_storage;
|
|
|
|
shell_command = "exec ";
|
|
|
|
/* Add any exec wrapper. That may be a program name with arguments,
|
|
so the user must handle quoting. */
|
|
if (exec_wrapper != NULL)
|
|
{
|
|
shell_command += exec_wrapper;
|
|
shell_command += ' ';
|
|
}
|
|
|
|
/* Now add exec_file, quoting as necessary. */
|
|
|
|
/* Quoting in this style is said to work with all shells. But csh
|
|
on IRIX 4.0.1 can't deal with it. So we only quote it if we need
|
|
to. */
|
|
bool need_to_quote;
|
|
const char *p = exec_file;
|
|
while (1)
|
|
{
|
|
switch (*p)
|
|
{
|
|
case '\'':
|
|
case '!':
|
|
case '"':
|
|
case '(':
|
|
case ')':
|
|
case '$':
|
|
case '&':
|
|
case ';':
|
|
case '<':
|
|
case '>':
|
|
case ' ':
|
|
case '\n':
|
|
case '\t':
|
|
need_to_quote = true;
|
|
goto end_scan;
|
|
|
|
case '\0':
|
|
need_to_quote = false;
|
|
goto end_scan;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
++p;
|
|
}
|
|
end_scan:
|
|
if (need_to_quote)
|
|
{
|
|
shell_command += '\'';
|
|
for (p = exec_file; *p != '\0'; ++p)
|
|
{
|
|
if (*p == '\'')
|
|
shell_command += "'\\''";
|
|
else if (*p == '!' && escape_bang)
|
|
shell_command += "\\!";
|
|
else
|
|
shell_command += *p;
|
|
}
|
|
shell_command += '\'';
|
|
}
|
|
else
|
|
shell_command += exec_file;
|
|
|
|
shell_command += ' ' + allargs;
|
|
|
|
/* If we decided above to start up with a shell, we exec the shell.
|
|
"-c" says to interpret the next arg as a shell command to
|
|
execute, and this command is "exec <target-program> <args>". */
|
|
m_argv.reserve (4);
|
|
m_argv.push_back (shell_file);
|
|
m_argv.push_back ("-c");
|
|
m_argv.push_back (shell_command.c_str ());
|
|
m_argv.push_back (NULL);
|
|
}
|
|
|
|
/* See nat/fork-inferior.h. */
|
|
|
|
pid_t
|
|
fork_inferior (const char *exec_file_arg, const std::string &allargs,
|
|
char **env, void (*traceme_fun) (),
|
|
void (*init_trace_fun) (int), void (*pre_trace_fun) (),
|
|
const char *shell_file_arg,
|
|
void (*exec_fun)(const char *file, char * const *argv,
|
|
char * const *env))
|
|
{
|
|
pid_t pid;
|
|
/* Set debug_fork then attach to the child while it sleeps, to debug. */
|
|
int debug_fork = 0;
|
|
const char *shell_file;
|
|
const char *exec_file;
|
|
char **save_our_env;
|
|
int i;
|
|
int save_errno;
|
|
const char *inferior_cwd;
|
|
std::string expanded_inferior_cwd;
|
|
|
|
/* If no exec file handed to us, get it from the exec-file command
|
|
-- with a good, common error message if none is specified. */
|
|
if (exec_file_arg == NULL)
|
|
exec_file = get_exec_file (1);
|
|
else
|
|
exec_file = exec_file_arg;
|
|
|
|
/* 'startup_with_shell' is declared in inferior.h and bound to the
|
|
"set startup-with-shell" option. If 0, we'll just do a
|
|
fork/exec, no shell, so don't bother figuring out what shell. */
|
|
if (startup_with_shell)
|
|
{
|
|
shell_file = shell_file_arg;
|
|
|
|
/* Figure out what shell to start up the user program under. */
|
|
if (shell_file == NULL)
|
|
shell_file = get_shell ();
|
|
|
|
gdb_assert (shell_file != NULL);
|
|
}
|
|
else
|
|
shell_file = NULL;
|
|
|
|
/* Build the argument vector. */
|
|
execv_argv child_argv (exec_file, allargs, shell_file);
|
|
|
|
/* Retain a copy of our environment variables, since the child will
|
|
replace the value of environ and if we're vforked, we have to
|
|
restore it. */
|
|
save_our_env = environ;
|
|
|
|
/* Perform any necessary actions regarding to TTY before the
|
|
fork/vfork call. */
|
|
prefork_hook (allargs.c_str ());
|
|
|
|
/* It is generally good practice to flush any possible pending stdio
|
|
output prior to doing a fork, to avoid the possibility of both
|
|
the parent and child flushing the same data after the fork. */
|
|
gdb_flush_out_err ();
|
|
|
|
/* Check if the user wants to set a different working directory for
|
|
the inferior. */
|
|
inferior_cwd = get_inferior_cwd ();
|
|
|
|
if (inferior_cwd != NULL)
|
|
{
|
|
/* Expand before forking because between fork and exec, the child
|
|
process may only execute async-signal-safe operations. */
|
|
expanded_inferior_cwd = gdb_tilde_expand (inferior_cwd);
|
|
inferior_cwd = expanded_inferior_cwd.c_str ();
|
|
}
|
|
|
|
/* If there's any initialization of the target layers that must
|
|
happen to prepare to handle the child we're about fork, do it
|
|
now... */
|
|
if (pre_trace_fun != NULL)
|
|
(*pre_trace_fun) ();
|
|
|
|
/* Create the child process. Since the child process is going to
|
|
exec(3) shortly afterwards, try to reduce the overhead by
|
|
calling vfork(2). However, if PRE_TRACE_FUN is non-null, it's
|
|
likely that this optimization won't work since there's too much
|
|
work to do between the vfork(2) and the exec(3). This is known
|
|
to be the case on ttrace(2)-based HP-UX, where some handshaking
|
|
between parent and child needs to happen between fork(2) and
|
|
exec(2). However, since the parent is suspended in the vforked
|
|
state, this doesn't work. Also note that the vfork(2) call might
|
|
actually be a call to fork(2) due to the fact that autoconf will
|
|
``#define vfork fork'' on certain platforms. */
|
|
#if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
|
|
if (pre_trace_fun || debug_fork)
|
|
pid = fork ();
|
|
else
|
|
#endif
|
|
pid = vfork ();
|
|
|
|
if (pid < 0)
|
|
perror_with_name (("vfork"));
|
|
|
|
if (pid == 0)
|
|
{
|
|
/* Close all file descriptors except those that gdb inherited
|
|
(usually 0/1/2), so they don't leak to the inferior. Note
|
|
that this closes the file descriptors of all secondary
|
|
UIs. */
|
|
close_most_fds ();
|
|
|
|
/* Change to the requested working directory if the user
|
|
requested it. */
|
|
if (inferior_cwd != NULL)
|
|
{
|
|
if (chdir (inferior_cwd) < 0)
|
|
trace_start_error_with_name (inferior_cwd);
|
|
}
|
|
|
|
if (debug_fork)
|
|
sleep (debug_fork);
|
|
|
|
/* Execute any necessary post-fork actions before we exec. */
|
|
postfork_child_hook ();
|
|
|
|
/* Changing the signal handlers for the inferior after
|
|
a vfork can also change them for the superior, so we don't mess
|
|
with signals here. See comments in
|
|
initialize_signals for how we get the right signal handlers
|
|
for the inferior. */
|
|
|
|
/* "Trace me, Dr. Memory!" */
|
|
(*traceme_fun) ();
|
|
|
|
/* The call above set this process (the "child") as debuggable
|
|
by the original gdb process (the "parent"). Since processes
|
|
(unlike people) can have only one parent, if you are debugging
|
|
gdb itself (and your debugger is thus _already_ the
|
|
controller/parent for this child), code from here on out is
|
|
undebuggable. Indeed, you probably got an error message
|
|
saying "not parent". Sorry; you'll have to use print
|
|
statements! */
|
|
|
|
restore_original_signals_state ();
|
|
|
|
/* There is no execlpe call, so we have to set the environment
|
|
for our child in the global variable. If we've vforked, this
|
|
clobbers the parent, but environ is restored a few lines down
|
|
in the parent. By the way, yes we do need to look down the
|
|
path to find $SHELL. Rich Pixley says so, and I agree. */
|
|
environ = env;
|
|
|
|
char **argv = child_argv.argv ();
|
|
|
|
if (exec_fun != NULL)
|
|
(*exec_fun) (argv[0], &argv[0], env);
|
|
else
|
|
execvp (argv[0], &argv[0]);
|
|
|
|
/* If we get here, it's an error. */
|
|
save_errno = errno;
|
|
warning ("Cannot exec %s", argv[0]);
|
|
|
|
for (i = 1; argv[i] != NULL; i++)
|
|
warning (" %s", argv[i]);
|
|
|
|
warning ("Error: %s", safe_strerror (save_errno));
|
|
|
|
_exit (0177);
|
|
}
|
|
|
|
/* Restore our environment in case a vforked child clob'd it. */
|
|
environ = save_our_env;
|
|
|
|
postfork_hook (pid);
|
|
|
|
/* Now that we have a child process, make it our target, and
|
|
initialize anything target-vector-specific that needs
|
|
initializing. */
|
|
if (init_trace_fun)
|
|
(*init_trace_fun) (pid);
|
|
|
|
/* We are now in the child process of interest, having exec'd the
|
|
correct program, and are poised at the first instruction of the
|
|
new program. */
|
|
return pid;
|
|
}
|
|
|
|
/* See nat/fork-inferior.h. */
|
|
|
|
ptid_t
|
|
startup_inferior (pid_t pid, int ntraps,
|
|
struct target_waitstatus *last_waitstatus,
|
|
ptid_t *last_ptid)
|
|
{
|
|
int pending_execs = ntraps;
|
|
int terminal_initted = 0;
|
|
ptid_t resume_ptid;
|
|
|
|
if (startup_with_shell)
|
|
{
|
|
/* One trap extra for exec'ing the shell. */
|
|
pending_execs++;
|
|
}
|
|
|
|
if (target_supports_multi_process ())
|
|
resume_ptid = ptid_t (pid);
|
|
else
|
|
resume_ptid = minus_one_ptid;
|
|
|
|
/* The process was started by the fork that created it, but it will
|
|
have stopped one instruction after execing the shell. Here we
|
|
must get it up to actual execution of the real program. */
|
|
if (get_exec_wrapper () != NULL)
|
|
pending_execs++;
|
|
|
|
while (1)
|
|
{
|
|
enum gdb_signal resume_signal = GDB_SIGNAL_0;
|
|
ptid_t event_ptid;
|
|
|
|
struct target_waitstatus ws;
|
|
memset (&ws, 0, sizeof (ws));
|
|
event_ptid = target_wait (resume_ptid, &ws, 0);
|
|
|
|
if (last_waitstatus != NULL)
|
|
*last_waitstatus = ws;
|
|
if (last_ptid != NULL)
|
|
*last_ptid = event_ptid;
|
|
|
|
if (ws.kind == TARGET_WAITKIND_IGNORE)
|
|
/* The inferior didn't really stop, keep waiting. */
|
|
continue;
|
|
|
|
switch (ws.kind)
|
|
{
|
|
case TARGET_WAITKIND_SPURIOUS:
|
|
case TARGET_WAITKIND_LOADED:
|
|
case TARGET_WAITKIND_FORKED:
|
|
case TARGET_WAITKIND_VFORKED:
|
|
case TARGET_WAITKIND_SYSCALL_ENTRY:
|
|
case TARGET_WAITKIND_SYSCALL_RETURN:
|
|
/* Ignore gracefully during startup of the inferior. */
|
|
switch_to_thread (event_ptid);
|
|
break;
|
|
|
|
case TARGET_WAITKIND_SIGNALLED:
|
|
target_terminal::ours ();
|
|
target_mourn_inferior (event_ptid);
|
|
error (_("During startup program terminated with signal %s, %s."),
|
|
gdb_signal_to_name (ws.value.sig),
|
|
gdb_signal_to_string (ws.value.sig));
|
|
return resume_ptid;
|
|
|
|
case TARGET_WAITKIND_EXITED:
|
|
target_terminal::ours ();
|
|
target_mourn_inferior (event_ptid);
|
|
if (ws.value.integer)
|
|
error (_("During startup program exited with code %d."),
|
|
ws.value.integer);
|
|
else
|
|
error (_("During startup program exited normally."));
|
|
return resume_ptid;
|
|
|
|
case TARGET_WAITKIND_EXECD:
|
|
/* Handle EXEC signals as if they were SIGTRAP signals. */
|
|
xfree (ws.value.execd_pathname);
|
|
resume_signal = GDB_SIGNAL_TRAP;
|
|
switch_to_thread (event_ptid);
|
|
break;
|
|
|
|
case TARGET_WAITKIND_STOPPED:
|
|
resume_signal = ws.value.sig;
|
|
switch_to_thread (event_ptid);
|
|
break;
|
|
}
|
|
|
|
if (resume_signal != GDB_SIGNAL_TRAP)
|
|
{
|
|
/* Let shell child handle its own signals in its own way. */
|
|
target_continue (resume_ptid, resume_signal);
|
|
}
|
|
else
|
|
{
|
|
/* We handle SIGTRAP, however; it means child did an exec. */
|
|
if (!terminal_initted)
|
|
{
|
|
/* Now that the child has exec'd we know it has already
|
|
set its process group. On POSIX systems, tcsetpgrp
|
|
will fail with EPERM if we try it before the child's
|
|
setpgid. */
|
|
|
|
/* Set up the "saved terminal modes" of the inferior
|
|
based on what modes we are starting it with. */
|
|
target_terminal::init ();
|
|
|
|
/* Install inferior's terminal modes. */
|
|
target_terminal::inferior ();
|
|
|
|
terminal_initted = 1;
|
|
}
|
|
|
|
if (--pending_execs == 0)
|
|
break;
|
|
|
|
/* Just make it go on. */
|
|
target_continue_no_signal (resume_ptid);
|
|
}
|
|
}
|
|
|
|
return resume_ptid;
|
|
}
|
|
|
|
/* See nat/fork-inferior.h. */
|
|
|
|
void
|
|
trace_start_error (const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start (ap, fmt);
|
|
warning ("Could not trace the inferior process.\nError: ");
|
|
vwarning (fmt, ap);
|
|
va_end (ap);
|
|
|
|
gdb_flush_out_err ();
|
|
_exit (0177);
|
|
}
|
|
|
|
/* See nat/fork-inferior.h. */
|
|
|
|
void
|
|
trace_start_error_with_name (const char *string)
|
|
{
|
|
trace_start_error ("%s: %s", string, safe_strerror (errno));
|
|
}
|