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37f802f864
__need_FOPEN_MAX wasn't being used anywhere. __need_IOV_MAX was more complicated; the basic deal is that sys/uio.h wants to define a constant named UIO_MAXIOV and bits/xopen_lim.h wants to define a constant named IOV_MAX, with the same meaning. For no apparent reason this was being handled via bits/stdio_lim.h -- stdio.h is NOT supposed to define IOV_MAX -- and some mess in Makerules. Also, bits/uio.h on Linux was being used as a dumping ground for extension functions. So now we have bits/uio_lim.h, which defines __IOV_MAX. bits/xopen_lim.h and sys/uio.h use that to define their respective constants. We also now have bits/uio-ext.h, which is the official Proper Home for extensions to sys/uio.h. bits/uio.h is removed, and stdio_lim.h doesn't define IOV_MAX at all. * bits/uio_lim.h, sysdeps/unix/sysv/linux/bits/uio_lim.h * bits/uio-ext.h, sysdeps/unix/sysv/linux/bits/uio-ext.h: New file. * bits/uio.h, sysdeps/unix/sysv/linux/bits/uio.h: Delete file. * include/bits/xopen_lim.h: Use bits/uio_lim.h to get the value for IOV_MAX. * misc/Makefile: Install bits/uio-ext.h and bits/uio_lim.h. Don't install bits/uio.h. * misc/sys/uio.h: Don't include bits/uio.h. Do include bits/types/struct_iovec.h and bits/uio_lim.h. Set UIO_MAXIOV based on __IOV_MAX. Under __USE_GNU, also include bits/uio-ext.h. * stdio-common/stdio_lim.h.in: Remove logic for __need_FOPEN_MAX and __need_IOV_MAX. Don't define IOV_MAX at all. * Makerules (stdio_lim.h): Remove logic for setting IOV_MAX. * sysdeps/unix/sysv/linux/bits/fcntl-linux.h: Include bits/types/struct_iovec.h, not bits/uio.h. Use __ssize_t, not ssize_t, in function prototypes. Don't use hard TAB for double space after period in comments.
33 lines
1.3 KiB
C
33 lines
1.3 KiB
C
/* Implementation limits related to sys/uio.h - Linux version.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _BITS_UIO_LIM_H
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#define _BITS_UIO_LIM_H 1
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/* Maximum length of the 'struct iovec' array in a single call to
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readv or writev.
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This macro has different values in different kernel versions. The
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latest versions of the kernel use 1024 and this is good choice. Since
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the C library implementation of readv/writev is able to emulate the
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functionality even if the currently running kernel does not support
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this large value the readv/writev call will not fail because of this. */
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#define __IOV_MAX 1024
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#endif
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