X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Finf-child.c;h=7909b0c2a42d344263f9c61abad691a10db248fa;hb=43684a7b844bce64735940b55b667f7086fa3d44;hp=b0d9c6996f3a2e397d0e1344e38f2ee31c508711;hpb=fa113d1a304c4653f02494b7b7c56ebfc3891bf5;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/inf-child.c b/gdb/inf-child.c
index b0d9c6996f..7909b0c2a4 100644
--- a/gdb/inf-child.c
+++ b/gdb/inf-child.c
@@ -1,14 +1,12 @@
-/* Default child (native) target interface, for GDB when running under
-   Unix.
+/* Base/prototype target for default child (native) targets.
 
-   Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
-   1998, 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
+   Copyright (C) 1988-2016 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 2 of the License, or
+   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,
@@ -17,9 +15,12 @@
    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, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   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"
@@ -27,36 +28,77 @@
 #include "symtab.h"
 #include "target.h"
 #include "inferior.h"
-#include "gdb_string.h"
+#include <sys/stat.h>
+#include "inf-child.h"
+#include "fileio.h"
+#include "agent.h"
+#include "gdb_wait.h"
+#include "filestuff.h"
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+/* A pointer to what is returned by inf_child_target.  Used by
+   inf_child_open to push the most-derived target in reaction to
+   "target native".  */
+static struct target_ops *inf_child_ops = NULL;
+
+/* 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));
+    }
+}
 
 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
    for all registers.  */
 
 static void
-inf_child_fetch_inferior_registers (int regnum)
+inf_child_fetch_inferior_registers (struct target_ops *ops,
+				    struct regcache *regcache, int regnum)
 {
   if (regnum == -1)
     {
-      for (regnum = 0; regnum < NUM_REGS; regnum++)
-	regcache_raw_supply (current_regcache, regnum, NULL);
+      for (regnum = 0;
+	   regnum < gdbarch_num_regs (get_regcache_arch (regcache));
+	   regnum++)
+	regcache_raw_supply (regcache, regnum, NULL);
     }
   else
-    regcache_raw_supply (current_regcache, regnum, NULL);
+    regcache_raw_supply (regcache, regnum, NULL);
 }
 
 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
    this for all registers (including the floating point registers).  */
 
 static void
-inf_child_store_inferior_registers (int regnum)
+inf_child_store_inferior_registers (struct target_ops *ops,
+				    struct regcache *regcache, int regnum)
 {
 }
 
 static void
-inf_child_post_attach (int pid)
+inf_child_post_attach (struct target_ops *self, int pid)
 {
-  /* This version of Unix doesn't require a meaningful "post attach"
-     operation by a debugger.  */
+  /* This target doesn't require a meaningful "post attach" operation
+     by a debugger.  */
 }
 
 /* Get ready to modify the registers array.  On machines which store
@@ -66,159 +108,337 @@ inf_child_post_attach (int pid)
    program being debugged.  */
 
 static void
-inf_child_prepare_to_store (void)
+inf_child_prepare_to_store (struct target_ops *self,
+			    struct regcache *regcache)
 {
 }
 
-static void
-inf_child_open (char *arg, int 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 (struct target_ops *target, const char *arg,
+		       int from_tty)
 {
-  error ("Use the \"run\" command to start a Unix child process.");
+  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");
 }
 
 static void
-inf_child_post_startup_inferior (ptid_t ptid)
+inf_child_open (const char *arg, int from_tty)
 {
-  /* This version of Unix doesn't require a meaningful "post startup
-     inferior" operation by a debugger.  */
+  inf_child_open_target (inf_child_ops, arg, from_tty);
 }
 
+/* Implement the to_disconnect target_ops method.  */
+
 static void
-inf_child_acknowledge_created_inferior (int pid)
+inf_child_disconnect (struct target_ops *target, const char *args, int from_tty)
 {
-  /* This version of Unix doesn't require a meaningful "acknowledge
-     created inferior" operation by a debugger.  */
+  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.  */
+
 static void
-inf_child_insert_fork_catchpoint (int pid)
+inf_child_close (struct target_ops *target)
 {
-  /* This version of Unix doesn't support notification of fork
-     events.  */
+  /* In case we were forcibly closed.  */
+  inf_child_explicitly_opened = 0;
 }
 
-static int
-inf_child_remove_fork_catchpoint (int pid)
+void
+inf_child_mourn_inferior (struct target_ops *ops)
 {
-  /* This version of Unix doesn't support notification of fork
-     events.  */
-  return 0;
+  generic_mourn_inferior ();
+  inf_child_maybe_unpush_target (ops);
+}
+
+/* See inf-child.h.  */
+
+void
+inf_child_maybe_unpush_target (struct target_ops *ops)
+{
+  if (!inf_child_explicitly_opened && !have_inferiors ())
+    unpush_target (ops);
 }
 
 static void
-inf_child_insert_vfork_catchpoint (int pid)
+inf_child_post_startup_inferior (struct target_ops *self, ptid_t ptid)
 {
-  /* This version of Unix doesn't support notification of vfork
-     events.  */
+  /* This target doesn't require a meaningful "post startup inferior"
+     operation by a debugger.  */
 }
 
 static int
-inf_child_remove_vfork_catchpoint (int pid)
+inf_child_follow_fork (struct target_ops *ops, int follow_child,
+		       int detach_fork)
 {
-  /* This version of Unix doesn't support notification of vfork
-     events.  */
+  /* This target doesn't support following fork or vfork events.  */
   return 0;
 }
 
 static int
-inf_child_follow_fork (int follow_child)
+inf_child_can_run (struct target_ops *self)
 {
-  /* This version of Unix doesn't support following fork or vfork
-     events.  */
-  return 0;
+  return 1;
 }
 
-static void
-inf_child_insert_exec_catchpoint (int pid)
+static char *
+inf_child_pid_to_exec_file (struct target_ops *self, int pid)
 {
-  /* This version of Unix doesn't support notification of exec
-     events.  */
+  /* This target doesn't support translation of a process ID to the
+     filename of the executable file.  */
+  return NULL;
 }
 
+/* Implementation of to_fileio_open.  */
+
 static int
-inf_child_remove_exec_catchpoint (int pid)
+inf_child_fileio_open (struct target_ops *self,
+		       struct inferior *inf, const char *filename,
+		       int flags, int mode, int warn_if_slow,
+		       int *target_errno)
 {
-  /* This version of Unix doesn't support notification of exec
-     events.  */
-  return 0;
+  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.  */
+
 static int
-inf_child_reported_exec_events_per_exec_call (void)
+inf_child_fileio_pwrite (struct target_ops *self,
+			 int fd, const gdb_byte *write_buf, int len,
+			 ULONGEST offset, int *target_errno)
 {
-  /* This version of Unix doesn't support notification of exec
-     events.  */
-  return 1;
+  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.  */
+
 static int
-inf_child_can_run (void)
+inf_child_fileio_pread (struct target_ops *self,
+			int fd, gdb_byte *read_buf, int len,
+			ULONGEST offset, int *target_errno)
 {
-  return 1;
+  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;
 }
 
-static struct symtab_and_line *
-inf_child_enable_exception_callback (enum exception_event_kind kind,
-				     int enable)
+/* Implementation of to_fileio_fstat.  */
+
+static int
+inf_child_fileio_fstat (struct target_ops *self, int fd,
+			struct stat *sb, int *target_errno)
 {
-  return (struct symtab_and_line *) NULL;
+  int ret;
+
+  ret = fstat (fd, sb);
+  if (ret == -1)
+    *target_errno = host_to_fileio_error (errno);
+
+  return ret;
 }
 
-static struct exception_event_record *
-inf_child_get_current_exception_event (void)
+/* Implementation of to_fileio_close.  */
+
+static int
+inf_child_fileio_close (struct target_ops *self, int fd, int *target_errno)
 {
-  return (struct exception_event_record *) NULL;
+  int ret;
+
+  ret = close (fd);
+  if (ret == -1)
+    *target_errno = host_to_fileio_error (errno);
+
+  return ret;
 }
 
+/* Implementation of to_fileio_unlink.  */
+
+static int
+inf_child_fileio_unlink (struct target_ops *self,
+			 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.  */
+
 static char *
-inf_child_pid_to_exec_file (int pid)
+inf_child_fileio_readlink (struct target_ops *self,
+			   struct inferior *inf, const char *filename,
+			   int *target_errno)
 {
-  /* This version of Unix doesn't support translation of a process ID
-     to the filename of the executable file.  */
+  /* 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;
+  char *ret;
+
+  len = readlink (filename, buf, sizeof buf);
+  if (len < 0)
+    {
+      *target_errno = host_to_fileio_error (errno);
+      return NULL;
+    }
+
+  ret = (char *) xmalloc (len + 1);
+  memcpy (ret, buf, len);
+  ret[len] = '\0';
+  return ret;
+#else
+  *target_errno = FILEIO_ENOSYS;
   return NULL;
+#endif
+}
+
+static int
+inf_child_use_agent (struct target_ops *self, int use)
+{
+  if (agent_loaded_p ())
+    {
+      use_agent = use;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+static int
+inf_child_can_use_agent (struct target_ops *self)
+{
+  return agent_loaded_p ();
+}
+
+/* Default implementation of the to_can_async_p and
+   to_supports_non_stop methods.  */
+
+static int
+return_zero (struct target_ops *ignore)
+{
+  return 0;
 }
 
 struct target_ops *
 inf_child_target (void)
 {
-  struct target_ops *t = XZALLOC (struct target_ops);
-  t->to_shortname = "child";
-  t->to_longname = "Unix child process";
-  t->to_doc = "Unix child process (started by the \"run\" command).";
+  struct target_ops *t = XCNEW (struct target_ops);
+
+  t->to_shortname = "native";
+  t->to_longname = "Native process";
+  t->to_doc = "Native process (started by the \"run\" command).";
   t->to_open = inf_child_open;
+  t->to_close = inf_child_close;
+  t->to_disconnect = inf_child_disconnect;
   t->to_post_attach = inf_child_post_attach;
   t->to_fetch_registers = inf_child_fetch_inferior_registers;
   t->to_store_registers = inf_child_store_inferior_registers;
   t->to_prepare_to_store = inf_child_prepare_to_store;
   t->to_insert_breakpoint = memory_insert_breakpoint;
   t->to_remove_breakpoint = memory_remove_breakpoint;
-  t->to_terminal_init = terminal_init_inferior;
-  t->to_terminal_inferior = terminal_inferior;
-  t->to_terminal_ours_for_output = terminal_ours_for_output;
-  t->to_terminal_save_ours = terminal_save_ours;
-  t->to_terminal_ours = terminal_ours;
+  t->to_terminal_init = child_terminal_init;
+  t->to_terminal_inferior = child_terminal_inferior;
+  t->to_terminal_ours_for_output = child_terminal_ours_for_output;
+  t->to_terminal_ours = child_terminal_ours;
   t->to_terminal_info = child_terminal_info;
   t->to_post_startup_inferior = inf_child_post_startup_inferior;
-  t->to_acknowledge_created_inferior = inf_child_acknowledge_created_inferior;
-  t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
-  t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
-  t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
-  t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
   t->to_follow_fork = inf_child_follow_fork;
-  t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
-  t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
-  t->to_reported_exec_events_per_exec_call =
-    inf_child_reported_exec_events_per_exec_call;
   t->to_can_run = inf_child_can_run;
-  t->to_enable_exception_callback = inf_child_enable_exception_callback;
-  t->to_get_current_exception_event = inf_child_get_current_exception_event;
+  /* We must default these because they must be implemented by any
+     target that can run.  */
+  t->to_can_async_p = return_zero;
+  t->to_supports_non_stop = return_zero;
   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
   t->to_stratum = process_stratum;
-  t->to_has_all_memory = 1;
-  t->to_has_memory = 1;
-  t->to_has_stack = 1;
-  t->to_has_registers = 1;
-  t->to_has_execution = 1;
+  t->to_has_all_memory = default_child_has_all_memory;
+  t->to_has_memory = default_child_has_memory;
+  t->to_has_stack = default_child_has_stack;
+  t->to_has_registers = default_child_has_registers;
+  t->to_has_execution = default_child_has_execution;
+  t->to_fileio_open = inf_child_fileio_open;
+  t->to_fileio_pwrite = inf_child_fileio_pwrite;
+  t->to_fileio_pread = inf_child_fileio_pread;
+  t->to_fileio_fstat = inf_child_fileio_fstat;
+  t->to_fileio_close = inf_child_fileio_close;
+  t->to_fileio_unlink = inf_child_fileio_unlink;
+  t->to_fileio_readlink = inf_child_fileio_readlink;
   t->to_magic = OPS_MAGIC;
+  t->to_use_agent = inf_child_use_agent;
+  t->to_can_use_agent = inf_child_can_use_agent;
+
+  /* Store a pointer so we can push the most-derived target from
+     inf_child_open.  */
+  inf_child_ops = t;
+
   return t;
 }