mirrors/tar
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

(full_write): Some buggy drivers return 0 when you

Browse Source 
fall off a device's end.  Detect this.
This commit is contained in:
Paul Eggert
2000-10-24 06:18:37 +00:00
parent 8d8a85f9a2
commit 5156a90a1e
1 changed files with 7 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
lib/full-write.c
View File

@@ -1,5 +1,5 @@
/* full-write.c -- an interface to write that retries after interrupts /* 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 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 it under the terms of the GNU General Public License as published by
@@ -36,7 +36,7 @@ extern int errno;
#endif #endif
/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted. /* 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 ssize_t
full_write (int desc, const char *ptr, size_t len) full_write (int desc, const char *ptr, size_t len)
@@ -46,17 +46,16 @@ full_write (int desc, const char *ptr, size_t len)
while (len > 0) while (len > 0)
{ {
ssize_t written = write (desc, ptr, len); ssize_t written = write (desc, ptr, len);
/* FIXME: write on my slackware Linux 1.2.13 returns zero when if (written <= 0)
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)
{ {
/* Some buggy drivers return 0 when you fall off a device's end. */
if (written == 0)
errno = ENOSPC;
#ifdef EINTR #ifdef EINTR
if (errno == EINTR) if (errno == EINTR)
continue; continue;
#endif #endif
return written; return -1;
} }
total_written += written; total_written += written;
ptr += written; ptr += written;