Use scoped_fd in more places

This changes a few more places to use scoped_fd.  This allows the
removal of some cleanups.

Regression tested by the buildbot, though note that I'm not sure
whether the buildbot actually builds anything using all of these
files.

gdb/ChangeLog
2018-03-08  Tom Tromey  <tom@tromey.com>

	* source.c (get_filename_and_charpos): Use scoped_fd.
	* nto-procfs.c (procfs_open_1): Use scoped_fd.
	(procfs_pidlist): Likewise.
	* procfs.c (proc_get_LDT_entry): Use scoped_fd.
	(iterate_over_mappings): Likewise.

4 files changed, 37 insertions, 46 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 3d9db8b..adc5d6a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,13 @@
 2018-03-08  Tom Tromey  <tom@tromey.com>
 
+	* source.c (get_filename_and_charpos): Use scoped_fd.
+	* nto-procfs.c (procfs_open_1): Use scoped_fd.
+	(procfs_pidlist): Likewise.
+	* procfs.c (proc_get_LDT_entry): Use scoped_fd.
+	(iterate_over_mappings): Likewise.
+
+2018-03-08  Tom Tromey  <tom@tromey.com>
+
 	* infcall.c (struct call_return_meta_info)
 	<stack_temporaries_enabled>: Remove.
 	(get_call_return_value, call_function_by_hand_dummy): Update.
diff --git a/gdb/nto-procfs.c b/gdb/nto-procfs.c
index d72bc11..5ff0156 100644
--- a/gdb/nto-procfs.c
+++ b/gdb/nto-procfs.c
@@ -43,6 +43,7 @@
 #include "solib.h"
 #include "inf-child.h"
 #include "common/filestuff.h"
+#include "common/scoped_fd.h"
 
 #define NULL_PID		0
 #define _DEBUG_FLAG_TRACE	(_DEBUG_FLAG_TRACE_EXEC|_DEBUG_FLAG_TRACE_RD|\
@@ -113,9 +114,8 @@ procfs_open_1 (struct target_ops *ops, const char *arg, int from_tty)
 {
   char *endstr;
   char buffer[50];
-  int fd, total_size;
+  int total_size;
   procfs_sysinfo *sysinfo;
-  struct cleanup *cleanups;
   char nto_procfs_path[PATH_MAX];
 
   /* Offer to kill previous inferiors before opening this target.  */
@@ -158,17 +158,16 @@ procfs_open_1 (struct target_ops *ops, const char *arg, int from_tty)
   snprintf (nto_procfs_path, PATH_MAX - 1, "%s%s",
 	    (nodestr != NULL) ? nodestr : "", "/proc");
 
-  fd = open (nto_procfs_path, O_RDONLY);
-  if (fd == -1)
+  scoped_fd fd (open (nto_procfs_path, O_RDONLY));
+  if (fd.get () == -1)
     {
       printf_filtered ("Error opening %s : %d (%s)\n", nto_procfs_path, errno,
 		       safe_strerror (errno));
       error (_("Invalid procfs arg"));
     }
-  cleanups = make_cleanup_close (fd);
 
   sysinfo = (void *) buffer;
-  if (devctl (fd, DCMD_PROC_SYSINFO, sysinfo, sizeof buffer, 0) != EOK)
+  if (devctl (fd.get (), DCMD_PROC_SYSINFO, sysinfo, sizeof buffer, 0) != EOK)
     {
       printf_filtered ("Error getting size: %d (%s)\n", errno,
 		       safe_strerror (errno));
@@ -186,7 +185,8 @@ procfs_open_1 (struct target_ops *ops, const char *arg, int from_tty)
 	}
       else
 	{
-	  if (devctl (fd, DCMD_PROC_SYSINFO, sysinfo, total_size, 0) != EOK)
+	  if (devctl (fd.get (), DCMD_PROC_SYSINFO, sysinfo, total_size, 0)
+	      != EOK)
 	    {
 	      printf_filtered ("Error getting sysinfo: %d (%s)\n", errno,
 			       safe_strerror (errno));
@@ -201,7 +201,6 @@ procfs_open_1 (struct target_ops *ops, const char *arg, int from_tty)
 	    }
 	}
     }
-  do_cleanups (cleanups);
 
   inf_child_open_target (ops, arg, from_tty);
   printf_filtered ("Debugging using %s\n", nto_procfs_path);
@@ -377,9 +376,6 @@ procfs_pidlist (const char *args, int from_tty)
 
   do
     {
-      int fd;
-      struct cleanup *inner_cleanup;
-
       /* Get the right pid and procfs path for the pid.  */
       do
 	{
@@ -397,17 +393,16 @@ procfs_pidlist (const char *args, int from_tty)
       while (pid == 0);
 
       /* Open the procfs path.  */
-      fd = open (buf, O_RDONLY);
-      if (fd == -1)
+      scoped_fd fd (open (buf, O_RDONLY));
+      if (fd.get () == -1)
 	{
 	  fprintf_unfiltered (gdb_stderr, "failed to open %s - %d (%s)\n",
 			      buf, errno, safe_strerror (errno));
 	  continue;
 	}
-      inner_cleanup = make_cleanup_close (fd);
 
       pidinfo = (procfs_info *) buf;
-      if (devctl (fd, DCMD_PROC_INFO, pidinfo, sizeof (buf), 0) != EOK)
+      if (devctl (fd.get (), DCMD_PROC_INFO, pidinfo, sizeof (buf), 0) != EOK)
 	{
 	  fprintf_unfiltered (gdb_stderr,
 			      "devctl DCMD_PROC_INFO failed - %d (%s)\n",
@@ -417,7 +412,8 @@ procfs_pidlist (const char *args, int from_tty)
       num_threads = pidinfo->num_threads;
 
       info = (procfs_debuginfo *) buf;
-      if (devctl (fd, DCMD_PROC_MAPDEBUG_BASE, info, sizeof (buf), 0) != EOK)
+      if (devctl (fd.get (), DCMD_PROC_MAPDEBUG_BASE, info, sizeof (buf), 0)
+	  != EOK)
 	strcpy (name, "unavailable");
       else
 	strcpy (name, info->path);
@@ -427,7 +423,7 @@ procfs_pidlist (const char *args, int from_tty)
       for (status->tid = 1; status->tid <= num_threads; status->tid++)
 	{
 	  const int err
-	    = devctl (fd, DCMD_PROC_TIDSTATUS, status, sizeof (buf), 0);
+	    = devctl (fd.get (), DCMD_PROC_TIDSTATUS, status, sizeof (buf), 0);
 	  printf_filtered ("%s - %d", name, pid);
 	  if (err == EOK && status->tid != 0)
 	    printf_filtered ("/%d\n", status->tid);
@@ -437,8 +433,6 @@ procfs_pidlist (const char *args, int from_tty)
 	      break;
 	    }
 	}
-
-      do_cleanups (inner_cleanup);
     }
   while (dirp != NULL);
 
diff --git a/gdb/procfs.c b/gdb/procfs.c
index 374faa9..cd6dcaa 100644
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -46,6 +46,7 @@
 #include "auxv.h"
 #include "procfs.h"
 #include "observer.h"
+#include "common/scoped_fd.h"
 
 /* This module provides the interface between GDB and the
    /proc file system, which is used on many versions of Unix
@@ -1593,8 +1594,6 @@ proc_get_LDT_entry (procinfo *pi, int key)
 {
   static struct ssd *ldt_entry = NULL;
   char pathname[MAX_PROC_NAME_SIZE];
-  struct cleanup *old_chain = NULL;
-  int  fd;
 
   /* Allocate space for one LDT entry.
      This alloc must persist, because we return a pointer to it.  */
@@ -1603,16 +1602,16 @@ proc_get_LDT_entry (procinfo *pi, int key)
 
   /* Open the file descriptor for the LDT table.  */
   sprintf (pathname, "/proc/%d/ldt", pi->pid);
-  if ((fd = open_with_retry (pathname, O_RDONLY)) < 0)
+  scoped_fd fd (open_with_retry (pathname, O_RDONLY));
+  if (fd.get () < 0)
     {
       proc_warn (pi, "proc_get_LDT_entry (open)", __LINE__);
       return NULL;
     }
-  /* Make sure it gets closed again!  */
-  old_chain = make_cleanup_close (fd);
 
   /* Now 'read' thru the table, find a match and return it.  */
-  while (read (fd, ldt_entry, sizeof (struct ssd)) == sizeof (struct ssd))
+  while (read (fd.get (), ldt_entry, sizeof (struct ssd))
+	 == sizeof (struct ssd))
     {
       if (ldt_entry->sel == 0 &&
 	  ldt_entry->bo  == 0 &&
@@ -1627,7 +1626,6 @@ proc_get_LDT_entry (procinfo *pi, int key)
 	}
     }
   /* Loop ended, match not found.  */
-  do_cleanups (old_chain);
   return NULL;
 }
 
@@ -3426,40 +3424,33 @@ iterate_over_mappings (procinfo *pi, find_memory_region_ftype child_func,
   struct prmap *prmaps;
   struct prmap *prmap;
   int funcstat;
-  int map_fd;
   int nmap;
-  struct cleanup *cleanups = make_cleanup (null_cleanup, NULL);
   struct stat sbuf;
 
   /* Get the number of mappings, allocate space,
      and read the mappings into prmaps.  */
   /* Open map fd.  */
   sprintf (pathname, "/proc/%d/map", pi->pid);
-  if ((map_fd = open (pathname, O_RDONLY)) < 0)
-    proc_error (pi, "iterate_over_mappings (open)", __LINE__);
 
-  /* Make sure it gets closed again.  */
-  make_cleanup_close (map_fd);
+  scoped_fd map_fd (open (pathname, O_RDONLY));
+  if (map_fd.get () < 0)
+    proc_error (pi, "iterate_over_mappings (open)", __LINE__);
 
   /* Use stat to determine the file size, and compute
      the number of prmap_t objects it contains.  */
-  if (fstat (map_fd, &sbuf) != 0)
+  if (fstat (map_fd.get (), &sbuf) != 0)
     proc_error (pi, "iterate_over_mappings (fstat)", __LINE__);
 
   nmap = sbuf.st_size / sizeof (prmap_t);
   prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
-  if (read (map_fd, (char *) prmaps, nmap * sizeof (*prmaps))
+  if (read (map_fd.get (), (char *) prmaps, nmap * sizeof (*prmaps))
       != (nmap * sizeof (*prmaps)))
     proc_error (pi, "iterate_over_mappings (read)", __LINE__);
 
   for (prmap = prmaps; nmap > 0; prmap++, nmap--)
     if ((funcstat = (*func) (prmap, child_func, data)) != 0)
-      {
-	do_cleanups (cleanups);
-        return funcstat;
-      }
+      return funcstat;
 
-  do_cleanups (cleanups);
   return 0;
 }
 
diff --git a/gdb/source.c b/gdb/source.c
index 3b4920f..5e50f42 100644
--- a/gdb/source.c
+++ b/gdb/source.c
@@ -42,6 +42,7 @@
 #include "ui-out.h"
 #include "readline/readline.h"
 #include "common/enum-flags.h"
+#include "common/scoped_fd.h"
 #include <algorithm>
 #include "common/pathstuff.h"
 
@@ -1215,24 +1216,21 @@ find_source_lines (struct symtab *s, int desc)
 static int
 get_filename_and_charpos (struct symtab *s, char **fullname)
 {
-  int desc, linenums_changed = 0;
-  struct cleanup *cleanups;
+  int linenums_changed = 0;
 
-  desc = open_source_file (s);
-  if (desc < 0)
+  scoped_fd desc (open_source_file (s));
+  if (desc.get () < 0)
     {
       if (fullname)
 	*fullname = NULL;
       return 0;
     }
-  cleanups = make_cleanup_close (desc);
   if (fullname)
     *fullname = s->fullname;
   if (s->line_charpos == 0)
     linenums_changed = 1;
   if (linenums_changed)
-    find_source_lines (s, desc);
-  do_cleanups (cleanups);
+    find_source_lines (s, desc.get ());
   return linenums_changed;
 }