summaryrefslogtreecommitdiff
path: root/libc/sysdeps
diff options
context:
space:
mode:
Diffstat (limited to 'libc/sysdeps')
-rw-r--r--libc/sysdeps/linux/common/Makefile3
-rw-r--r--libc/sysdeps/linux/common/pread_write.c213
-rw-r--r--libc/sysdeps/linux/common/syscalls.c36
3 files changed, 219 insertions, 33 deletions
diff --git a/libc/sysdeps/linux/common/Makefile b/libc/sysdeps/linux/common/Makefile
index a7a254cc5..3e6a5136d 100644
--- a/libc/sysdeps/linux/common/Makefile
+++ b/libc/sysdeps/linux/common/Makefile
@@ -33,7 +33,8 @@ CSRC= waitpid.c statfix.c getdnnm.c gethstnm.c getcwd.c \
mkfifo.c setegid.c wait.c getpagesize.c seteuid.c \
wait3.c setpgrp.c getdtablesize.c create_module.c ptrace.c \
cmsg_nxthdr.c statfix64.c longjmp.c open64.c ftruncate64.c \
- truncate64.c getrlimit64.c setrlimit64.c creat64.c mmap64.c
+ truncate64.c getrlimit64.c setrlimit64.c creat64.c mmap64.c \
+ pread_write.c
ifneq ($(strip $(EXCLUDE_BRK)),true)
CSRC+=sbrk.c
endif
diff --git a/libc/sysdeps/linux/common/pread_write.c b/libc/sysdeps/linux/common/pread_write.c
new file mode 100644
index 000000000..319de5af1
--- /dev/null
+++ b/libc/sysdeps/linux/common/pread_write.c
@@ -0,0 +1,213 @@
+/* vi: set sw=4 ts=4:
+ *
+ * Copyright (C) 2002 by Erik Andersen <andersen@uclibc.org>
+ * Based in part on the files
+ * ./sysdeps/unix/sysv/linux/pwrite.c,
+ * ./sysdeps/unix/sysv/linux/pread.c,
+ * sysdeps/posix/pread.c
+ * sysdeps/posix/pwrite.c
+ * from GNU libc 2.2.5, but reworked considerably...
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 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 Library General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <features.h>
+#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS != 64
+#undef _FILE_OFFSET_BITS
+#define _FILE_OFFSET_BITS 64
+#endif
+#ifndef __USE_LARGEFILE64
+# define __USE_LARGEFILE64 1
+#endif
+/* We absolutely do _NOT_ want interfaces silently
+ * renamed under us or very bad things will happen... */
+#ifdef __USE_FILE_OFFSET64
+# undef __USE_FILE_OFFSET64
+#endif
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#define _XOPEN_SOURCE 500
+#include <unistd.h>
+
+#ifdef __NR_pread
+#define __NR___syscall_pread __NR_pread
+static inline _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf, size_t, count,
+ __off_t, offset_hi, __off_t, offset_lo);
+#endif
+
+#ifdef __NR_pwrite
+#define __NR___syscall_pwrite __NR_pwrite
+static inline _syscall5(ssize_t, __syscall_pwrite, int, fd, const void *, buf, size_t, count,
+ __off_t, offset_hi, __off_t, offset_lo);
+#endif
+
+
+static ssize_t __fake_pread_write(int fd, void *buf,
+ size_t count, __off_t offset, int do_pwrite)
+{
+ int save_errno;
+ ssize_t result;
+ off64_t old_offset;
+
+ /* Since we must not change the file pointer preserve the
+ * value so that we can restore it later. */
+ if ((old_offset=lseek64(fd, 0, SEEK_CUR)) == (off64_t) -1)
+ return -1;
+
+ /* Set to wanted position. */
+ if (lseek (fd, offset, SEEK_SET) == (__off_t) -1)
+ return -1;
+
+ if (do_pwrite==1) {
+ /* Write the data. */
+ result = write(fd, buf, count);
+ } else {
+ /* Read the data. */
+ result = read(fd, buf, count);
+ }
+
+ /* Now we have to restore the position. If this fails we
+ * have to return this as an error. */
+ save_errno = errno;
+ if (lseek (fd, old_offset, SEEK_SET) == (__off_t) -1)
+ {
+ if (result == -1)
+ __set_errno (save_errno);
+ return -1;
+ }
+ __set_errno (save_errno);
+ return(result);
+}
+
+ssize_t __libc_pread(int fd, void *buf, size_t count, __off_t offset)
+{
+#ifndef __NR_pread
+ return(__fake_pread_write(fd, buf, count, offset, 0));
+#else
+ ssize_t result;
+
+ /* First try the syscall. */
+ result = __syscall_pread(fd, buf, count, __LONG_LONG_PAIR(0, offset));
+
+ /* Bummer. Syscall failed or is missing. Fake it */
+ if (result == -1 && errno == ENOSYS) {
+ result = __fake_pread_write(fd, buf, count, offset, 0);
+ }
+#endif
+ return result;
+}
+weak_alias (__libc_pread, pread)
+
+ssize_t __libc_pwrite(int fd, const void *buf, size_t count, __off_t offset)
+{
+#ifndef __NR_pwrite
+ return(__fake_pread_write(fd, buf, count, offset, 1));
+#else
+ ssize_t result;
+
+ /* First try the syscall. */
+ result = __syscall_pwrite(fd, buf, count, __LONG_LONG_PAIR(0, offset));
+
+ /* Bummer. Syscall failed or is missing. Fake it */
+ if (result == -1 && errno == ENOSYS) {
+ result = __fake_pread_write(fd, (void*)buf, count, offset, 1);
+ }
+#endif
+ return result;
+}
+weak_alias (__libc_pwrite, pwrite)
+
+
+
+
+#if defined __UCLIBC_HAVE_LFS__
+static ssize_t __fake_pread_write64(int fd, void *buf,
+ size_t count, off64_t offset, int do_pwrite)
+{
+ int save_errno;
+ ssize_t result;
+ off64_t old_offset;
+
+ /* Since we must not change the file pointer preserve the
+ * value so that we can restore it later. */
+ if ((old_offset=lseek64(fd, 0, SEEK_CUR)) == (off64_t) -1)
+ return -1;
+
+ /* Set to wanted position. */
+ if (lseek64(fd, offset, SEEK_SET) == (off64_t) -1)
+ return -1;
+
+ if (do_pwrite==1) {
+ /* Write the data. */
+ result = write(fd, buf, count);
+ } else {
+ /* Read the data. */
+ result = read(fd, buf, count);
+ }
+
+ /* Now we have to restore the position. */
+ save_errno = errno;
+ if (lseek64 (fd, old_offset, SEEK_SET) == (off64_t) -1) {
+ if (result == -1)
+ __set_errno (save_errno);
+ return -1;
+ }
+ __set_errno (save_errno);
+ return result;
+}
+
+ssize_t __libc_pread64(int fd, void *buf, size_t count, off64_t offset)
+{
+#ifndef __NR_pread
+ return(__fake_pread_write64(fd, buf, count, offset, 0));
+#else
+ ssize_t result;
+ /* First try the syscall. */
+ result = __syscall_pread(fd, buf, count,
+ __LONG_LONG_PAIR((__off_t) (offset >> 32), (__off_t) (offset & 0xffffffff)));
+
+ /* Bummer. Syscall failed or is missing. Fake it */
+ if (result == -1 && errno == ENOSYS) {
+ result = __fake_pread_write64(fd, buf, count, offset, 0);
+ }
+ return result;
+#endif
+}
+weak_alias (__libc_pread64, pread64)
+
+ssize_t __libc_pwrite64(int fd, const void *buf, size_t count, off64_t offset)
+{
+#ifndef __NR_pwrite
+ return(__fake_pread_write64(fd, (void*)buf, count, offset, 1));
+#else
+ ssize_t result;
+
+ /* First try the syscall. */
+ result = __syscall_pwrite(fd, buf, count,
+ __LONG_LONG_PAIR((__off_t) (offset >> 32), (__off_t) (offset & 0xffffffff)));
+
+ /* Bummer. Syscall failed or is missing. Fake it */
+ if (result == -1 && errno == ENOSYS) {
+ result = __fake_pread_write64(fd, (void*)buf, count, offset, 1);
+ }
+ return result;
+#endif
+}
+weak_alias (__libc_pwrite64, pwrite64)
+
+#endif
+
diff --git a/libc/sysdeps/linux/common/syscalls.c b/libc/sysdeps/linux/common/syscalls.c
index 318bbfbb3..1b63c3dba 100644
--- a/libc/sysdeps/linux/common/syscalls.c
+++ b/libc/sysdeps/linux/common/syscalls.c
@@ -1254,8 +1254,8 @@ __loff_t __libc_lseek64(int fd, __loff_t offset, int whence)
int ret;
__loff_t result;
- ret = _llseek(fd, (__off_t) (offset >> 32),
- (__off_t) (offset & 0xffffffff), &result, whence);
+ ret = _llseek(fd, __LONG_LONG_PAIR((__off_t) (offset >> 32),
+ (__off_t) (offset & 0xffffffff)), &result, whence);
return ret ? (__loff_t) ret : result;
}
@@ -1574,38 +1574,10 @@ int sigsuspend (const sigset_t *mask)
#endif
//#define __NR_pread 180
-#ifdef L___libc_pread
-#ifdef __NR_pread
-#define _XOPEN_SOURCE 500
-#include <unistd.h>
-#define __NR___libc_pread __NR_pread
-_syscall4(ssize_t, __libc_pread, int, fd, void *, buf, size_t, count, __off_t, offset);
-weak_alias (__libc_pread, pread)
-#else
-ssize_t pread(int fd, void *buf, size_t count, off_t offset)
-{
- __set_errno(ENOSYS);
- return -1;
-}
-#endif
-#endif
+// See pread_write.c
//#define __NR_pwrite 181
-#ifdef L___libc_pwrite
-#ifdef __NR_pwrite
-#define _XOPEN_SOURCE 500
-#include <unistd.h>
-#define __NR___libc_pwrite __NR_pwrite
-_syscall4(ssize_t, __libc_pwrite, int, fd, const void *, buf, size_t, count, __off_t, offset);
-weak_alias (__libc_pwrite, pwrite)
-#else
-ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset)
-{
- __set_errno(ENOSYS);
- return -1;
-}
-#endif
-#endif
+// See pread_write.c
//#define __NR_chown 182
#ifdef L_chown
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 19:05:12 +0000