/* Base/prototype target for default child (native) targets. Copyright (C) 1988-2021 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/>. */ /* This file provides a common base class/target that all native target implementations extend, by calling inf_child_target to get a new prototype target and then overriding target methods as necessary. */ #include "defs.h" #include "regcache.h" #include "memattr.h" #include "symtab.h" #include "target.h" #include "inferior.h" #include <sys/stat.h> #include "inf-child.h" #include "gdbsupport/fileio.h" #include "gdbsupport/agent.h" #include "gdbsupport/gdb_wait.h" #include "gdbsupport/filestuff.h" #include <sys/types.h> #include <fcntl.h> #include <unistd.h> static const target_info inf_child_target_info = { "native", N_("Native process"), N_("Native process (started by the \"run\" command).") }; const target_info & inf_child_target::info () const { return inf_child_target_info; } /* Helper function for child_wait and the derivatives of child_wait. HOSTSTATUS is the waitstatus from wait() or the equivalent; store our translation of that in OURSTATUS. */ void store_waitstatus (struct target_waitstatus *ourstatus, int hoststatus) { if (WIFEXITED (hoststatus)) { ourstatus->kind = TARGET_WAITKIND_EXITED; ourstatus->value.integer = WEXITSTATUS (hoststatus); } else if (!WIFSTOPPED (hoststatus)) { ourstatus->kind = TARGET_WAITKIND_SIGNALLED; ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (hoststatus)); } else { ourstatus->kind = TARGET_WAITKIND_STOPPED; ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (hoststatus)); } } inf_child_target::~inf_child_target () {} void inf_child_target::post_attach (int pid) { /* This target doesn't require a meaningful "post attach" operation by a debugger. */ } /* Get ready to modify the registers array. On machines which store individual registers, this doesn't need to do anything. On machines which store all the registers in one fell swoop, this makes sure that registers contains all the registers from the program being debugged. */ void inf_child_target::prepare_to_store (struct regcache *regcache) { } bool inf_child_target::supports_terminal_ours () { return true; } void inf_child_target::terminal_init () { child_terminal_init (this); } void inf_child_target::terminal_inferior () { child_terminal_inferior (this); } void inf_child_target::terminal_save_inferior () { child_terminal_save_inferior (this); } void inf_child_target::terminal_ours_for_output () { child_terminal_ours_for_output (this); } void inf_child_target::terminal_ours () { child_terminal_ours (this); } void inf_child_target::interrupt () { child_interrupt (this); } void inf_child_target::pass_ctrlc () { child_pass_ctrlc (this); } void inf_child_target::terminal_info (const char *args, int from_tty) { child_terminal_info (this, args, from_tty); } /* True if the user did "target native". In that case, we won't unpush the child target automatically when the last inferior is gone. */ static int inf_child_explicitly_opened; /* See inf-child.h. */ void inf_child_open_target (const char *arg, int from_tty) { target_ops *target = get_native_target (); /* There's always only ever one native target, and if we get here, it better be an inf-child target. */ gdb_assert (dynamic_cast<inf_child_target *> (target) != NULL); target_preopen (from_tty); push_target (target); inf_child_explicitly_opened = 1; if (from_tty) printf_filtered ("Done. Use the \"run\" command to start a process.\n"); } /* Implement the to_disconnect target_ops method. */ void inf_child_target::disconnect (const char *args, int from_tty) { if (args != NULL) error (_("Argument given to \"disconnect\".")); /* This offers to detach/kill current inferiors, and then pops all targets. */ target_preopen (from_tty); } /* Implement the to_close target_ops method. */ void inf_child_target::close () { /* In case we were forcibly closed. */ inf_child_explicitly_opened = 0; } void inf_child_target::mourn_inferior () { generic_mourn_inferior (); maybe_unpush_target (); } /* See inf-child.h. */ void inf_child_target::maybe_unpush_target () { if (!inf_child_explicitly_opened) unpush_target (this); } void inf_child_target::post_startup_inferior (ptid_t ptid) { /* This target doesn't require a meaningful "post startup inferior" operation by a debugger. */ } bool inf_child_target::can_run () { return true; } bool inf_child_target::can_create_inferior () { return true; } bool inf_child_target::can_attach () { return true; } char * inf_child_target::pid_to_exec_file (int pid) { /* This target doesn't support translation of a process ID to the filename of the executable file. */ return NULL; } /* Implementation of to_fileio_open. */ int inf_child_target::fileio_open (struct inferior *inf, const char *filename, int flags, int mode, int warn_if_slow, int *target_errno) { int nat_flags; mode_t nat_mode; int fd; if (fileio_to_host_openflags (flags, &nat_flags) == -1 || fileio_to_host_mode (mode, &nat_mode) == -1) { *target_errno = FILEIO_EINVAL; return -1; } fd = gdb_open_cloexec (filename, nat_flags, nat_mode); if (fd == -1) *target_errno = host_to_fileio_error (errno); return fd; } /* Implementation of to_fileio_pwrite. */ int inf_child_target::fileio_pwrite (int fd, const gdb_byte *write_buf, int len, ULONGEST offset, int *target_errno) { int ret; #ifdef HAVE_PWRITE ret = pwrite (fd, write_buf, len, (long) offset); #else ret = -1; #endif /* If we have no pwrite or it failed for this file, use lseek/write. */ if (ret == -1) { ret = lseek (fd, (long) offset, SEEK_SET); if (ret != -1) ret = write (fd, write_buf, len); } if (ret == -1) *target_errno = host_to_fileio_error (errno); return ret; } /* Implementation of to_fileio_pread. */ int inf_child_target::fileio_pread (int fd, gdb_byte *read_buf, int len, ULONGEST offset, int *target_errno) { int ret; #ifdef HAVE_PREAD ret = pread (fd, read_buf, len, (long) offset); #else ret = -1; #endif /* If we have no pread or it failed for this file, use lseek/read. */ if (ret == -1) { ret = lseek (fd, (long) offset, SEEK_SET); if (ret != -1) ret = read (fd, read_buf, len); } if (ret == -1) *target_errno = host_to_fileio_error (errno); return ret; } /* Implementation of to_fileio_fstat. */ int inf_child_target::fileio_fstat (int fd, struct stat *sb, int *target_errno) { int ret; ret = fstat (fd, sb); if (ret == -1) *target_errno = host_to_fileio_error (errno); return ret; } /* Implementation of to_fileio_close. */ int inf_child_target::fileio_close (int fd, int *target_errno) { int ret; ret = ::close (fd); if (ret == -1) *target_errno = host_to_fileio_error (errno); return ret; } /* Implementation of to_fileio_unlink. */ int inf_child_target::fileio_unlink (struct inferior *inf, const char *filename, int *target_errno) { int ret; ret = unlink (filename); if (ret == -1) *target_errno = host_to_fileio_error (errno); return ret; } /* Implementation of to_fileio_readlink. */ gdb::optional<std::string> inf_child_target::fileio_readlink (struct inferior *inf, const char *filename, int *target_errno) { /* We support readlink only on systems that also provide a compile-time maximum path length (PATH_MAX), at least for now. */ #if defined (PATH_MAX) char buf[PATH_MAX]; int len; len = readlink (filename, buf, sizeof buf); if (len < 0) { *target_errno = host_to_fileio_error (errno); return {}; } return std::string (buf, len); #else *target_errno = FILEIO_ENOSYS; return {}; #endif } bool inf_child_target::use_agent (bool use) { if (agent_loaded_p ()) { ::use_agent = use; return true; } else return false; } bool inf_child_target::can_use_agent () { return agent_loaded_p (); } /* See inf-child.h. */ void add_inf_child_target (inf_child_target *target) { set_native_target (target); add_target (inf_child_target_info, inf_child_open_target); }