Arrange to call close_stdout upon exit.

Don't close stdout explicitly.  Replace uses of global constant,
output_desc, with uses of STDOUT_FILENO.

diff --git a/src/cat.c b/src/cat.c
index 37f47c96760942dea7948d91262fec755c69c32e..c5c1a732efda9600e6be2d34068bf5bb82720d50 100644 (file)
--- a/src/cat.c
+++ b/src/cat.c
@@ -1,5 +1,5 @@
 /* cat -- concatenate files and print on the standard output.
-   Copyright (C) 88, 90, 91, 1995-1999 Free Software Foundation, Inc.
+   Copyright (C) 88, 90, 91, 1995-2000 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -31,6 +31,7 @@
 # include <sys/ioctl.h>
 #endif
 #include "system.h"
+#include "closeout.h"
 #include "error.h"
 #include "safe-read.h"
 
@@ -54,9 +55,6 @@ static char *infile;
 /* Descriptor on which input file is open.  */
 static int input_desc;
 
-/* Descriptor on which output file is open.  Always is 1.  */
-static int output_desc;
-
 /* Buffer for line numbers.  */
 static char line_buf[13] =
 {' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '0', '\t', '\0'};
@@ -136,8 +134,7 @@ next_line_num (void)
     line_num_print--;
 }
 
-/* Plain cat.  Copies the file behind `input_desc' to the file behind
-   `output_desc'.  */
+/* Plain cat.  Copies the file behind `input_desc' to STDOUT_FILENO.  */
 
 static void
 simple_cat (
@@ -172,7 +169,7 @@ simple_cat (
 
       /* Write this block out.  */
 
-      if (full_write (output_desc, buf, n_read) < 0)
+      if (full_write (STDOUT_FILENO, buf, n_read) < 0)
        error (EXIT_FAILURE, errno, _("write error"));
     }
 }
@@ -253,7 +250,7 @@ cat (
              unsigned char *wp = outbuf;
              do
                {
-                 if (full_write (output_desc, wp, outsize) < 0)
+                 if (full_write (STDOUT_FILENO, wp, outsize) < 0)
                    error (EXIT_FAILURE, errno, _("write error"));
                  wp += outsize;
                }
@@ -306,7 +303,7 @@ cat (
                {
                  int n_write = bpout - outbuf;
 
-                 if (full_write (output_desc, outbuf, n_write) < 0)
+                 if (full_write (STDOUT_FILENO, outbuf, n_write) < 0)
                    error (EXIT_FAILURE, errno, _("write error"));
                  bpout = outbuf;
                }
@@ -465,6 +462,17 @@ cat (
     }
 }
 
+/* This is gross, but necessary, because of the way close_stdout
+   works and because this program closes STDOUT_FILENO directly.  */
+static void (*closeout_func) (void) = close_stdout;
+
+static void
+close_stdout_wrapper (void)
+{
+  if (closeout_func)
+    (*closeout_func) ();
+}
+
 int
 main (int argc, char **argv)
 {
@@ -537,6 +545,8 @@ main (int argc, char **argv)
   bindtextdomain (PACKAGE, LOCALEDIR);
   textdomain (PACKAGE);
 
+  atexit (close_stdout);
+
   /* Parse command line options.  */
 
   while ((c = getopt_long (argc, argv,
@@ -622,11 +632,11 @@ main (int argc, char **argv)
        }
     }
 
-  output_desc = 1;
+  closeout_func = NULL;
 
   /* Get device, i-node number, and optimal blocksize of output.  */
 
-  if (fstat (output_desc, &stat_buf) < 0)
+  if (fstat (STDOUT_FILENO, &stat_buf) < 0)
     error (EXIT_FAILURE, errno, _("standard output"));
 
   outsize = ST_BLKSIZE (stat_buf);
@@ -659,13 +669,13 @@ main (int argc, char **argv)
      with only CR-LF is an empty line.  (Besides, if they ask for
      one of these options, they don't care much about the original
      file contents anyway).  */
-  if ((!isatty (output_desc)
+  if ((!isatty (STDOUT_FILENO)
        && !(numbers || squeeze_empty_lines || mark_line_ends))
       || binary_files)
     {
       /* Switch stdout to BINARY mode.  */
       binary_output = 1;
-      SET_BINARY (output_desc);
+      SET_BINARY (STDOUT_FILENO);
       /* When stdout is in binary mode, make sure all input files are
         also read in binary mode.  */
       file_open_mode |= O_BINARY;
@@ -681,8 +691,8 @@ main (int argc, char **argv)
 
       /* Setting stdin to binary switches the console device to
         raw I/O, which also affects stdout to console.  Undo that.  */
-      if (isatty (output_desc))
-       setmode (output_desc, O_TEXT);
+      if (isatty (STDOUT_FILENO))
+       setmode (STDOUT_FILENO, O_TEXT);
     }
 #endif
 
@@ -715,7 +725,7 @@ main (int argc, char **argv)
                 This is so "cat > xyzzy" creates a DOS-style text
                 file, like people expect.  */
              if (tty_in && optind <= argc)
-               setmode (output_desc, O_TEXT);
+               setmode (STDOUT_FILENO, O_TEXT);
              else
                {
                  SET_BINARY (input_desc);
@@ -756,7 +766,7 @@ main (int argc, char **argv)
 
       if (check_redirection
          && stat_buf.st_dev == out_dev && stat_buf.st_ino == out_ino
-         && (input_desc != STDIN_FILENO || output_desc != STDOUT_FILENO))
+         && (input_desc != STDIN_FILENO))
        {
          error (0, 0, _("%s: input file is output file"), infile);
          exit_status = 1;
@@ -816,8 +826,6 @@ main (int argc, char **argv)
 
   if (have_read_stdin && close (0) < 0)
     error (EXIT_FAILURE, errno, "-");
-  if (close (1) < 0)
-    error (EXIT_FAILURE, errno, _("write error"));
 
   exit (exit_status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
 }