diff options
Diffstat (limited to 'archive/llseek.c')
-rw-r--r-- | archive/llseek.c | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/archive/llseek.c b/archive/llseek.c deleted file mode 100644 index fcc53faa..00000000 --- a/archive/llseek.c +++ /dev/null @@ -1,128 +0,0 @@ -/* - * llseek.c -- stub calling the llseek system call - * - * Copyright (C) 1994 Remy Card. This file may be redistributed - * under the terms of the GNU Public License. - * - * This file is borrowed from the util-linux-2.11z tarball's implementation - * of fdisk. It allows seeks to 64 bit offsets, if supported. - * Changed "ext2_" prefix to "llse". - */ - -#include "config.h" - -#define _XOPEN_SOURCE 500 -#define _GNU_SOURCE - -#include <sys/types.h> - -#include <errno.h> -#include <unistd.h> - -#if defined(__GNUC__) || defined(HAS_LONG_LONG) -typedef int64_t llse_loff_t; -#else -typedef long llse_loff_t; -#endif - -extern llse_loff_t llse_llseek (unsigned int, llse_loff_t, unsigned int); - -#ifdef __linux__ - -#ifdef HAVE_LLSEEK -#include <syscall.h> - -#else /* HAVE_LLSEEK */ - -#if defined(__alpha__) || defined(__ia64__) || defined(__s390x__) || defined (__x86_64__) || defined (__powerpc64__) - -#define my_llseek lseek - -#else -#include <linux/unistd.h> /* for __NR__llseek */ - -static int _llseek (unsigned int, unsigned long, - unsigned long, llse_loff_t *, unsigned int); - -#ifdef __NR__llseek - -static _syscall5(int,_llseek,unsigned int,fd,unsigned long,offset_high, - unsigned long, offset_low,llse_loff_t *,result, - unsigned int, origin) - -#else - -/* no __NR__llseek on compilation machine - might give it explicitly */ -static int _llseek (unsigned int fd, unsigned long oh, - unsigned long ol, llse_loff_t *result, - unsigned int origin) { - errno = ENOSYS; - return -1; -} - -#endif - -static llse_loff_t my_llseek (unsigned int fd, llse_loff_t offset, - unsigned int origin) -{ - llse_loff_t result; - int retval; - -#ifdef HAVE_LSEEK64 - return lseek64 (fd, offset, origin); -#else - retval = _llseek (fd, ((uint64_t) offset) >> 32, - ((uint64_t) offset) & 0xffffffff, - &result, origin); - return (retval == -1 ? (llse_loff_t) retval : result); -#endif -} - -#endif /* __alpha__ */ - -#endif /* HAVE_LLSEEK */ - -llse_loff_t llse_llseek (unsigned int fd, llse_loff_t offset, - unsigned int origin) -{ - llse_loff_t result; - static int do_compat = 0; - - if (!do_compat) { - result = my_llseek (fd, offset, origin); - if (!(result == -1 && errno == ENOSYS)) - return result; - - /* - * Just in case this code runs on top of an old kernel - * which does not support the llseek system call - */ - do_compat = 1; - /* - * Now try ordinary lseek. - */ - } - - if ((sizeof(off_t) >= sizeof(llse_loff_t)) || - (offset < ((llse_loff_t) 1 << ((sizeof(off_t)*8) -1)))) - return lseek(fd, (off_t) offset, origin); - - errno = EINVAL; - return -1; -} - -#else /* !linux */ - -llse_loff_t llse_llseek (unsigned int fd, llse_loff_t offset, - unsigned int origin) -{ - if ((sizeof(off_t) < sizeof(llse_loff_t)) && - (offset >= ((llse_loff_t) 1 << ((sizeof(off_t)*8) -1)))) { - errno = EINVAL; - return -1; - } - return lseek (fd, (off_t) offset, origin); -} - -#endif /* linux */ - |