X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=lib%2Fsafe-read.c;fp=lib%2Fsafe-read.c;h=0000000000000000000000000000000000000000;hb=3322ff6164a1e9dd3d1622c64a9b9b7c5f303ef6;hp=0cb1edee8bc789ab6589d2cd93c7e265ce1a418a;hpb=d73c4937b8f7712f6eb78774fa9711b701b419fd;p=tar diff --git a/lib/safe-read.c b/lib/safe-read.c deleted file mode 100644 index 0cb1ede..0000000 --- a/lib/safe-read.c +++ /dev/null @@ -1,77 +0,0 @@ -/* An interface to read and write that retries after interrupts. - - Copyright (C) 1993, 1994, 1998, 2002, 2003, 2004, 2005, 2006 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 - the Free Software Foundation; either version 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see . */ - -#include - -/* Specification. */ -#ifdef SAFE_WRITE -# include "safe-write.h" -#else -# include "safe-read.h" -#endif - -/* Get ssize_t. */ -#include -#include - -#include - -#ifdef EINTR -# define IS_EINTR(x) ((x) == EINTR) -#else -# define IS_EINTR(x) 0 -#endif - -#include - -#ifdef SAFE_WRITE -# define safe_rw safe_write -# define rw write -#else -# define safe_rw safe_read -# define rw read -# undef const -# define const /* empty */ -#endif - -/* Read(write) up to COUNT bytes at BUF from(to) descriptor FD, retrying if - interrupted. Return the actual number of bytes read(written), zero for EOF, - or SAFE_READ_ERROR(SAFE_WRITE_ERROR) upon error. */ -size_t -safe_rw (int fd, void const *buf, size_t count) -{ - /* Work around a bug in Tru64 5.1. Attempting to read more than - INT_MAX bytes fails with errno == EINVAL. See - . - When decreasing COUNT, keep it block-aligned. */ - enum { BUGGY_READ_MAXIMUM = INT_MAX & ~8191 }; - - for (;;) - { - ssize_t result = rw (fd, buf, count); - - if (0 <= result) - return result; - else if (IS_EINTR (errno)) - continue; - else if (errno == EINVAL && BUGGY_READ_MAXIMUM < count) - count = BUGGY_READ_MAXIMUM; - else - return result; - } -}