From e109c6124fe121618e42ba882e2a0af6e97b8efc Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Fri, 3 Apr 2009 19:57:16 +0000 Subject: * misc/Makefile (routines): Add preadv, preadv64, pwritev, pwritev64. * misc/Versions: Export preadv, preadv64, pwritev, pwritev64 for GLIBC_2.10. * misc/sys/uio.h: Declare preadv, preadv64, pwritev, pwritev64. * sysdeps/unix/sysv/linux/kernel-features.h: Add entries for preadv and pwritev. * misc/preadv.c: New file. * misc/preadv64.c: New file. * misc/pwritev.c: New file. * misc/pwritev64.c: New file. * sysdeps/posx/preadv.c: New file. * sysdeps/posx/preadv64.c: New file. * sysdeps/posx/pwritev.c: New file. * sysdeps/posx/pwritev64.c: New file. * sysdeps/unix/sysv/linux/preadv.c: New file. * sysdeps/unix/sysv/linux/preadv64.c: New file. * sysdeps/unix/sysv/linux/pwritev.c: New file. * sysdeps/unix/sysv/linux/pwritev64.c: New file. * sysdeps/unix/sysv/linux/wordsize-64/preadv64.c: New file. * sysdeps/unix/sysv/linux/wordsize-64/pwritev64.c: New file. --- sysdeps/posix/preadv.c | 108 ++++++++++++++++++++++++++++++++++++++++++++++ sysdeps/posix/preadv64.c | 9 ++++ sysdeps/posix/pwritev.c | 108 ++++++++++++++++++++++++++++++++++++++++++++++ sysdeps/posix/pwritev64.c | 9 ++++ 4 files changed, 234 insertions(+) create mode 100644 sysdeps/posix/preadv.c create mode 100644 sysdeps/posix/preadv64.c create mode 100644 sysdeps/posix/pwritev.c create mode 100644 sysdeps/posix/pwritev64.c (limited to 'sysdeps/posix') diff --git a/sysdeps/posix/preadv.c b/sysdeps/posix/preadv.c new file mode 100644 index 0000000000..e697604c19 --- /dev/null +++ b/sysdeps/posix/preadv.c @@ -0,0 +1,108 @@ +/* Copyright (C) 2009 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include +#include +#include +#include +#include +#include +#include +#if __WORDSIZE == 64 && !defined PREADV +/* Hide the preadv64 declaration. */ +# define preadv64 __redirect_preadv64 +#endif +#include +#include + +#ifndef PREADV +# define PREADV preadv +# define PREAD __pread +# define OFF_T off_t +#endif + + +static void +ifree (char **ptrp) +{ + free (*ptrp); +} + + +/* 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 VECTOR, which is a vector of COUNT 'struct iovec's. + The buffers are filled in the order specified. Operates just like + 'read' (see ) except that data are put in VECTOR instead + of a contiguous buffer. */ +ssize_t +PREADV (int fd, const struct iovec *vector, int count, OFF_T offset) +{ + /* Find the total number of bytes to be read. */ + size_t bytes = 0; + for (int i = 0; i < count; ++i) + { + /* Check for ssize_t overflow. */ + if (SSIZE_MAX - bytes < vector[i].iov_len) + { + __set_errno (EINVAL); + return -1; + } + bytes += vector[i].iov_len; + } + + /* Allocate a temporary buffer to hold the data. We should normally + use alloca since it's faster and does not require synchronization + with other threads. But we cannot if the amount of memory + required is too large. */ + char *buffer; + char *malloced_buffer __attribute__ ((__cleanup__ (ifree))) = NULL; + if (__libc_use_alloca (bytes)) + buffer = (char *) __alloca (bytes); + else + { + malloced_buffer = buffer = (char *) malloc (bytes); + if (buffer == NULL) + return -1; + } + + /* Read the data. */ + ssize_t bytes_read = PREAD (fd, buffer, bytes, offset); + if (bytes_read <= 0) + return -1; + + /* Copy the data from BUFFER into the memory specified by VECTOR. */ + bytes = bytes_read; + for (int i = 0; i < count; ++i) + { + size_t copy = MIN (vector[i].iov_len, bytes); + + (void) memcpy ((void *) vector[i].iov_base, (void *) buffer, copy); + + buffer += copy; + bytes -= copy; + if (bytes == 0) + break; + } + + return bytes_read; +} +#if __WORDSIZE == 64 && defined preadv64 +# undef preadv64 +strong_alias (preadv, preadv64) +#endif diff --git a/sysdeps/posix/preadv64.c b/sysdeps/posix/preadv64.c new file mode 100644 index 0000000000..198622353a --- /dev/null +++ b/sysdeps/posix/preadv64.c @@ -0,0 +1,9 @@ +#include + +#if __WORDSIZE == 32 +# define PREADV preadv64 +# define PREAD __pread64 +# define OFF_T off64_t + +# include "preadv.c" +#endif diff --git a/sysdeps/posix/pwritev.c b/sysdeps/posix/pwritev.c new file mode 100644 index 0000000000..0b6627dc9d --- /dev/null +++ b/sysdeps/posix/pwritev.c @@ -0,0 +1,108 @@ +/* Copyright (C) 2009 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include +#include +#include +#include +#include +#include +#include +#if __WORDSIZE == 64 && !defined PWRITEV +/* Hide the pwritev64 declaration. */ +# define pwritev64 __redirect_pwritev64 +#endif +#include +#include + +#ifndef PWRITEV +# define PWRITEV pwritev +# define PWRITE __pwrite +# define OFF_T off_t +#endif + + +static void +ifree (char **ptrp) +{ + free (*ptrp); +} + + +/* 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 VECTOR, which is a vector of COUNT 'struct iovec's. + The buffers are filled in the order specified. Operates just like + 'read' (see ) except that data are put in VECTOR instead + of a contiguous buffer. */ +ssize_t +PWRITEV (int fd, const struct iovec *vector, int count, OFF_T offset) +{ + /* Find the total number of bytes to be read. */ + size_t bytes = 0; + for (int i = 0; i < count; ++i) + { + /* Check for ssize_t overflow. */ + if (SSIZE_MAX - bytes < vector[i].iov_len) + { + __set_errno (EINVAL); + return -1; + } + bytes += vector[i].iov_len; + } + + /* Allocate a temporary buffer to hold the data. We should normally + use alloca since it's faster and does not require synchronization + with other threads. But we cannot if the amount of memory + required is too large. */ + char *buffer; + char *malloced_buffer __attribute__ ((__cleanup__ (ifree))) = NULL; + if (__libc_use_alloca (bytes)) + buffer = (char *) __alloca (bytes); + else + { + malloced_buffer = buffer = (char *) malloc (bytes); + if (buffer == NULL) + return -1; + } + + /* Read the data. */ + ssize_t bytes_read = PWRITE (fd, buffer, bytes, offset); + if (bytes_read <= 0) + return -1; + + /* Copy the data from BUFFER into the memory specified by VECTOR. */ + bytes = bytes_read; + for (int i = 0; i < count; ++i) + { + size_t copy = MIN (vector[i].iov_len, bytes); + + (void) memcpy ((void *) vector[i].iov_base, (void *) buffer, copy); + + buffer += copy; + bytes -= copy; + if (bytes == 0) + break; + } + + return bytes_read; +} +#if __WORDSIZE == 64 && defined pwritev64 +# undef pwritev64 +strong_alias (pwritev, pwritev64) +#endif diff --git a/sysdeps/posix/pwritev64.c b/sysdeps/posix/pwritev64.c new file mode 100644 index 0000000000..4948d2efee --- /dev/null +++ b/sysdeps/posix/pwritev64.c @@ -0,0 +1,9 @@ +#include + +#if __WORDSIZE == 32 +# define PWRITEV pwritev64 +# define PWRITE __pwrite64 +# define OFF_T off64_t + +# include "pwritev.c" +#endif -- cgit 1.4.1