/* closeout.c - close standard output
- Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 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
#include "closeout.h"
#include "error.h"
+static int default_exit_status = EXIT_FAILURE;
+
+/* Set the value to be used for the exit status when close_stdout is called.
+ This is useful when it is not convenient to call close_stdout_status,
+ e.g., when close_stdout is called via atexit. */
+void
+close_stdout_set_status (int status)
+{
+ default_exit_status = status;
+}
+
/* Close standard output, exiting with status STATUS on failure.
- If a program writes *anything* to stdout, that program should close
- stdout and make sure that the close succeeds. Otherwise, suppose that
- you go to the extreme of checking the return status of every function
- that does an explicit write to stdout. The last printf can succeed in
- writing to the internal stream buffer, and yet the fclose(stdout) could
- still fail (due e.g., to a disk full error) when it tries to write
- out that buffered data. Thus, you would be left with an incomplete
- output file and the offending program would exit successfully.
+ If a program writes *anything* to stdout, that program should `fflush'
+ stdout and make sure that it succeeds before exiting. Otherwise,
+ suppose that you go to the extreme of checking the return status
+ of every function that does an explicit write to stdout. The last
+ printf can succeed in writing to the internal stream buffer, and yet
+ the fclose(stdout) could still fail (due e.g., to a disk full error)
+ when it tries to write out that buffered data. Thus, you would be
+ left with an incomplete output file and the offending program would
+ exit successfully.
+
+ FIXME: note the fflush suggested above is implicit in the fclose
+ we actually do below. Consider doing only the fflush and/or using
+ setvbuf to inhibit buffering.
Besides, it's wasteful to check the return value from every call
that writes to stdout -- just let the internal stream state record
void
close_stdout (void)
{
- close_stdout_status (EXIT_FAILURE);
+ close_stdout_status (default_exit_status);
}