/* full-write.c -- an interface to write that retries after interrupts
- Copyright (C) 1993, 1994, 1997, 1998, 1999 Free Software Foundation, Inc.
+ Copyright 1993, 1994, 1997, 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
#endif
/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted.
- Return LEN upon success, write's (negative) error code otherwise. */
+ Return LEN upon success, -1 (setting errno) otherwise. */
ssize_t
full_write (int desc, const char *ptr, size_t len)
while (len > 0)
{
ssize_t written = write (desc, ptr, len);
- /* FIXME: write on my slackware Linux 1.2.13 returns zero when
- I try to write more data than there is room on a floppy disk.
- This puts dd into an infinite loop. Reproduce with
- dd if=/dev/zero of=/dev/fd0. */
- if (written < 0)
+ if (written <= 0)
{
+ /* Some buggy drivers return 0 when you fall off a device's end. */
+ if (written == 0)
+ errno = ENOSPC;
#ifdef EINTR
if (errno == EINTR)
continue;
#endif
- return written;
+ return -1;
}
total_written += written;
ptr += written;