PR gdb/7912:

* Makefile.in (SFILES): Add filestuff.c
	(COMMON_OBS): Add filestuff.o.
	(filestuff.o): New target.
	* auto-load.c (auto_load_objfile_script_1): Use
	gdb_fopen_cloexec.
	* auxv.c (procfs_xfer_auxv): Use gdb_open_cloexec.
	* cli/cli-cmds.c (shell_escape): Call close_most_fds.
	* cli/cli-dump.c (fopen_with_cleanup): Use gdb_fopen_cloexec.
	* common/agent.c (gdb_connect_sync_socket): Use
	gdb_socket_cloexec.
	* common/filestuff.c: New file.
	* common/filestuff.h: New file.
	* common/linux-osdata.c (linux_common_core_of_thread)
	(command_from_pid, commandline_from_pid, print_source_lines)
	(linux_xfer_osdata_shm, linux_xfer_osdata_sem)
	(linux_xfer_osdata_msg, linux_xfer_osdata_modules): Use
	gdb_fopen_cloexec.
	* common/linux-procfs.c (linux_proc_get_int)
	(linux_proc_pid_has_state): Use gdb_fopen_cloexec.
	* config.in, configure: Rebuild.
	* configure.ac: Don't check for sys/socket.h.  Check for
	fdwalk, pipe2.
	* corelow.c (core_open): Use gdb_open_cloexec.
	* dwarf2read.c (write_psymtabs_to_index): Use gdb_fopen_cloexec.
	* fork-child.c (fork_inferior): Call close_most_fds.
	* gdb_bfd.c (gdb_bfd_open): Use gdb_open_cloexec.
	* inf-child.c (inf_child_fileio_readlink): Use gdb_open_cloexec.
	* linux-nat.c (linux_nat_thread_name, linux_proc_pending_signals):
	Use gdb_fopen_cloexec.
	(linux_proc_xfer_partial, linux_proc_xfer_spu): Use
	gdb_open_cloexec.
	(linux_async_pipe): Use gdb_pipe_cloexec.
	* remote-fileio.c (remote_fileio_func_open): Use
	gdb_open_cloexec.
	* remote.c (remote_file_put, remote_file_get): Use
	gdb_fopen_cloexec.
	* ser-pipe.c (pipe_open): Use gdb_socketpair_cloexec,
	close_most_fds.
	* ser-tcp.c (net_open): Use gdb_socket_cloexec.
	* ser-unix.c (hardwire_open): Use gdb_open_cloexec.
	* solib.c (solib_find): Use gdb_open_cloexec.
	* source.c (openp, find_and_open_source): Use gdb_open_cloexec.
	* tracepoint.c (tfile_start): Use gdb_fopen_cloexec.
	(tfile_open): Use gdb_open_cloexec.
	* tui/tui-io.c (tui_initialize_io): Use gdb_pipe_cloexec.
	* ui-file.c (gdb_fopen): Use gdb_fopen_cloexec.
	* xml-support.c (xml_fetch_content_from_file): Use
	gdb_fopen_cloexec.
	* main.c (captured_main): Call notice_open_fds.
gdbserver
	* Makefile.in (SFILES): Add filestuff.c.
	(OBS): Add filestuff.o.
	(filestuff.o): New target.
	* config.in, configure: Rebuild.
	* configure.ac: Check for fdwalk, pipe2.

gdb/linux-nat.c

@@ -67,6 +67,7 @@
 #include "linux-ptrace.h"
 #include "buffer.h"
 #include "target-descriptions.h"
+#include "filestuff.h"
 
 #ifndef SPUFS_MAGIC
 #define SPUFS_MAGIC 0x23c9b64e
@@ -4271,7 +4272,7 @@ linux_nat_thread_name (struct thread_info *thr)
   char *result = NULL;
 
   snprintf (buf, sizeof (buf), FORMAT, pid, lwp);
-  comm_file = fopen (buf, "r");
+  comm_file = gdb_fopen_cloexec (buf, "r");
   if (comm_file)
     {
       /* Not exported by the kernel, so we define it here.  */
@@ -4398,7 +4399,7 @@ linux_proc_xfer_partial (struct target_ops *ops, enum target_object object,
   /* We could keep this file open and cache it - possibly one per
      thread.  That requires some juggling, but is even faster.  */
   sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid));
-  fd = open (filename, O_RDONLY | O_LARGEFILE);
+  fd = gdb_open_cloexec (filename, O_RDONLY | O_LARGEFILE, 0);
   if (fd == -1)
     return 0;
 
@@ -4492,7 +4493,7 @@ linux_proc_xfer_spu (struct target_ops *ops, enum target_object object,
     }
 
   xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex);
-  fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
+  fd = gdb_open_cloexec (buf, writebuf? O_WRONLY : O_RDONLY, 0);
   if (fd <= 0)
     return -1;
 
@@ -4568,7 +4569,7 @@ linux_proc_pending_signals (int pid, sigset_t *pending,
   sigemptyset (blocked);
   sigemptyset (ignored);
   sprintf (fname, "/proc/%d/status", pid);
-  procfile = fopen (fname, "r");
+  procfile = gdb_fopen_cloexec (fname, "r");
   if (procfile == NULL)
     error (_("Could not open %s"), fname);
   cleanup = make_cleanup_fclose (procfile);
@@ -4911,7 +4912,7 @@ linux_async_pipe (int enable)
 
       if (enable)
 	{
-	  if (pipe (linux_nat_event_pipe) == -1)
+	  if (gdb_pipe_cloexec (linux_nat_event_pipe) == -1)
 	    internal_error (__FILE__, __LINE__,
 			    "creating event pipe failed.");