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authorWaldemar Brodkorb <wbx@uclibc-ng.org>2016-12-28 02:13:31 (GMT)
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2017-01-14 17:31:49 (GMT)
commitae0bcade2ae104331974563c92fe62cf6ed7c975 (patch)
tree692082d07f6c10faaab41db22a75b7b3b1aa4ac1
parentfbd8eee2038f479845cb78891b96c7899ca5cb49 (diff)
add wrappers for preadv/pwritev
-rw-r--r--include/sys/uio.h26
-rw-r--r--libc/sysdeps/linux/common/preadv.c26
-rw-r--r--libc/sysdeps/linux/common/pwritev.c26
3 files changed, 78 insertions, 0 deletions
diff --git a/include/sys/uio.h b/include/sys/uio.h
index efc681e..78341ed 100644
--- a/include/sys/uio.h
+++ b/include/sys/uio.h
@@ -48,6 +48,32 @@ extern ssize_t readv (int __fd, const struct iovec *__iovec, int __count);
__THROW. */
extern ssize_t writev (int __fd, const struct iovec *__iovec, int __count);
+#ifdef __USE_MISC
+/* Read data from file descriptor FD at the given position OFFSET
+ without change the file pointer, and put the result in the buffers
+ described by IOVEC, which is a vector of COUNT 'struct iovec's.
+ The buffers are filled in the order specified. Operates just like
+ 'pread' (see <unistd.h>) except that data are put in IOVEC instead
+ of a contiguous buffer.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern ssize_t preadv (int __fd, const struct iovec *__iovec, int __count,
+ __off_t __offset) __wur;
+
+/* Write data pointed by the buffers described by IOVEC, which is a
+ vector of COUNT 'struct iovec's, to file descriptor FD at the given
+ position OFFSET without change the file pointer. The data is
+ written in the order specified. Operates just like 'pwrite' (see
+ <unistd.h>) except that the data are taken from IOVEC instead of a
+ contiguous buffer.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count,
+ __off_t __offset) __wur;
+#endif /* Use misc. */
+
__END_DECLS
#endif /* sys/uio.h */
diff --git a/libc/sysdeps/linux/common/preadv.c b/libc/sysdeps/linux/common/preadv.c
new file mode 100644
index 0000000..20adc6d
--- /dev/null
+++ b/libc/sysdeps/linux/common/preadv.c
@@ -0,0 +1,26 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sys/uio.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+ssize_t
+preadv (int fd, const struct iovec *vector, int count, off_t offset)
+{
+ return INLINE_SYSCALL (preadv, 4, fd, vector, count, offset);
+}
diff --git a/libc/sysdeps/linux/common/pwritev.c b/libc/sysdeps/linux/common/pwritev.c
new file mode 100644
index 0000000..cbc58f9
--- /dev/null
+++ b/libc/sysdeps/linux/common/pwritev.c
@@ -0,0 +1,26 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sys/uio.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+ssize_t
+pwritev (int fd, const struct iovec *vector, int count, off_t offset)
+{
+ return INLINE_SYSCALL (pwritev, 4, fd, vector, count, offset);
+}