Allow passing fd == NULL to exec_file_find and solib_find

This commit allows NULL to be passed as the int *fd argument
to exec_file_find and solib_find to simplify use cases where
the caller does not require the file to be opened.

gdb/ChangeLog:

	* solib.c (solib_find_1): Allow fd argument to be NULL.
	(exec_file_find): Update comment.
	(solib_find): Likewise.
	* exec.c (exec_file_locate_attach): Use NULL as fd
	argument to exec_file_find to avoid having to close
	the opened file.
	* infrun.c (follow_exec): Likewise.

1 files changed, 1 insertions, 6 deletions

diff --git a/gdb/infrun.c b/gdb/infrun.c
index f09e2da..a4f0b9f 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -1136,12 +1136,7 @@ follow_exec (ptid_t ptid, char *execd_pathname)
 
   if (gdb_sysroot != NULL && *gdb_sysroot != '\0')
     {
-      int fd = -1;
-      char *name;
-
-      name = exec_file_find (execd_pathname, &fd);
-      if (fd >= 0)
-	close (fd);
+      char *name = exec_file_find (execd_pathname, NULL);
 
       execd_pathname = alloca (strlen (name) + 1);
       strcpy (execd_pathname, name);