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/common/linux-osdata.c

@@ -44,6 +44,7 @@
 #include "gdb_assert.h"
 #include "gdb_dirent.h"
 #include "gdb_stat.h"
+#include "filestuff.h"
 
 /* Define PID_T to be a fixed size that is at least as large as pid_t,
    so that reading pid values embedded in /proc works
@@ -76,7 +77,7 @@ linux_common_core_of_thread (ptid_t ptid)
 
   sprintf (filename, "/proc/%lld/task/%lld/stat",
 	   (PID_T) ptid_get_pid (ptid), (PID_T) ptid_get_lwp (ptid));
-  f = fopen (filename, "r");
+  f = gdb_fopen_cloexec (filename, "r");
   if (!f)
     return -1;
 
@@ -125,7 +126,7 @@ static void
 command_from_pid (char *command, int maxlen, PID_T pid)
 {
   char *stat_path = xstrprintf ("/proc/%lld/stat", pid); 
-  FILE *fp = fopen (stat_path, "r");
+  FILE *fp = gdb_fopen_cloexec (stat_path, "r");
   
   command[0] = '\0';
  
@@ -165,7 +166,7 @@ commandline_from_pid (PID_T pid)
 {
   char *pathname = xstrprintf ("/proc/%lld/cmdline", pid);
   char *commandline = NULL;
-  FILE *f = fopen (pathname, "r");
+  FILE *f = gdb_fopen_cloexec (pathname, "r");
 
   if (f)
     {
@@ -860,7 +861,7 @@ print_sockets (unsigned short family, int tcp, struct buffer *buffer)
   else
     return;
 
-  fp = fopen (proc_file, "r");
+  fp = gdb_fopen_cloexec (proc_file, "r");
   if (fp)
     {
       char buf[8192];
@@ -1088,7 +1089,7 @@ linux_xfer_osdata_shm (gdb_byte *readbuf,
       buffer_init (&buffer);
       buffer_grow_str (&buffer, "<osdata type=\"shared memory\">\n");
 
-      fp = fopen ("/proc/sysvipc/shm", "r");
+      fp = gdb_fopen_cloexec ("/proc/sysvipc/shm", "r");
       if (fp)
 	{
 	  char buf[8192];
@@ -1216,7 +1217,7 @@ linux_xfer_osdata_sem (gdb_byte *readbuf,
       buffer_init (&buffer);
       buffer_grow_str (&buffer, "<osdata type=\"semaphores\">\n");
 
-      fp = fopen ("/proc/sysvipc/sem", "r");
+      fp = gdb_fopen_cloexec ("/proc/sysvipc/sem", "r");
       if (fp)
 	{
 	  char buf[8192];
@@ -1328,7 +1329,7 @@ linux_xfer_osdata_msg (gdb_byte *readbuf,
       buffer_init (&buffer);
       buffer_grow_str (&buffer, "<osdata type=\"message queues\">\n");
       
-      fp = fopen ("/proc/sysvipc/msg", "r");
+      fp = gdb_fopen_cloexec ("/proc/sysvipc/msg", "r");
       if (fp)
 	{
 	  char buf[8192];
@@ -1454,7 +1455,7 @@ linux_xfer_osdata_modules (gdb_byte *readbuf,
       buffer_init (&buffer);
       buffer_grow_str (&buffer, "<osdata type=\"modules\">\n");
 
-      fp = fopen ("/proc/modules", "r");
+      fp = gdb_fopen_cloexec ("/proc/modules", "r");
       if (fp)
 	{
 	  char buf[8192];