Check return values of functions declared with warn_unused_result

attribute in GLIBC 2.8.
* cli/cli-cmds.c (pwd_command): Check return value from getcwd.
* inflow.c (check_syscall): New function.
(new_tty): Use check_syscall to check return values from open and dup.
* linux-nat.c (linux_nat_info_proc_cmd): Check return value from fgets.
* main.c (captured_main): Call cwd after setting up gdb_stderr;
check for errors from getcwd.
* mi/mi-cmd-env.c (mi_cmd_env_pwd): Check return value from getcwd.
* ui-file.c (stdio_file_write): Ignore return value from fwrite.
(stdio_file_fputs): Same.
* utils.c (internal_vproblem): abort if last-ditch error message
write fails.

1 files changed, 9 insertions, 3 deletions

diff --git a/gdb/main.c b/gdb/main.c
index ccd5e46..0eb9596 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -188,9 +188,6 @@ captured_main (void *data)
   line[0] = '\0';		/* Terminate saved (now empty) cmd line */
   instream = stdin;
 
-  getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
-  current_directory = gdb_dirbuf;
-
   gdb_stdout = stdio_fileopen (stdout);
   gdb_stderr = stdio_fileopen (stderr);
   gdb_stdlog = gdb_stderr;	/* for moment */
@@ -199,6 +196,15 @@ captured_main (void *data)
   gdb_stdtargerr = gdb_stderr;	/* for moment */
   gdb_stdtargin = gdb_stdin;	/* for moment */
 
+  if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)))
+    /* Don't use *_filtered or warning() (which relies on
+       current_target) until after initialize_all_files(). */
+    fprintf_unfiltered (gdb_stderr,
+                        _("%s: warning: error finding working directory: %s\n"),
+                        argv[0], safe_strerror (errno));
+    
+  current_directory = gdb_dirbuf;
+
   /* Set the sysroot path.  */
 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
   gdb_sysroot = make_relative_prefix (argv[0], BINDIR, TARGET_SYSTEM_ROOT);