From 9fe3c80c7c3dbce34dadc7f0693d211fdd9a0b03 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Tue, 25 Apr 2017 17:52:47 +0000 Subject: Fix sys/socket.h namespace issues from sys/uio.h inclusion (bug 21426). sys/socket.h includes sys/uio.h to get the definition of the iovec structure. POSIX allows sys/socket.h to make all sys/uio.h symbols visible. However, all of sys/uio.h is XSI-shaded, so for non-XSI POSIX this results in conformtest failures (for sys/socket.h and other headers that include it): Namespace violation: "UIO_MAXIOV" Namespace violation: "readv" Namespace violation: "writev" Now, there is some ambiguity in POSIX about what namespace reservations apply in this case - see http://austingroupbugs.net/view.php?id=1127 - but glibc convention would still avoid declaring readv and writev, for example, for feature test macros that don't include them (if only headers from the relevant standard are included), even if such declarations are permitted, so there is a bug here according to glibc conventions. This patch moves the struct iovec definition to a new bits/types/struct_iovec.h header and includes that from sys/socket.h instead of including the whole of sys/uio.h. This fixes the namespace issue; however, three files in glibc that were relying on the implicit inclusion needed to be updated to include sys/uio.h explicitly. So there is a question of whether sys/socket.h should continue to include sys/uio.h under some conditions, such as __USE_XOPEN or __USE_MISC or __USE_XOPEN || __USE_MISC, for greater compatibility with code that (wrongly) expects this optional inclusion to be present there. (I think the three affected files in glibc should still have explicit sys/uio.h inclusions added in any case, however.) Tested for x86_64. [BZ #21426] * misc/bits/types/struct_iovec.h: New file. * misc/Makefile (headers): Add bits/types/struct_iovec.h. * include/bits/types/struct_iovec.h: New file. * bits/uio.h (struct iovec): Replace by inclusion of . * sysdeps/unix/sysv/linux/bits/uio.h (struct iovec): Likewise. * socket/sys/socket.h: Include instead of . * nptl/tst-cancel4.c: Include * posix/test-errno.c: Likewise. * support/resolv_test.c: Likewise. * conform/Makefile (test-xfail-POSIX2008/arpa/inet.h/conform): Remove. (test-xfail-POSIX2008/netdb.h/conform): Likewise. (test-xfail-POSIX2008/netinet/in.h/conform): Likewise. (test-xfail-POSIX2008/sys/socket.h/conform): Likewise. --- misc/Makefile | 2 +- misc/bits/types/struct_iovec.h | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+), 1 deletion(-) create mode 100644 misc/bits/types/struct_iovec.h (limited to 'misc') diff --git a/misc/Makefile b/misc/Makefile index ed988c3..622da67 100644 --- a/misc/Makefile +++ b/misc/Makefile @@ -35,7 +35,7 @@ headers := sys/uio.h bits/uio.h sys/ioctl.h bits/ioctls.h bits/ioctl-types.h \ syslog.h sys/syslog.h \ bits/syslog.h bits/syslog-ldbl.h bits/syslog-path.h bits/error.h \ bits/select2.h bits/hwcap.h sys/auxv.h \ - sys/sysmacros.h bits/sysmacros.h + sys/sysmacros.h bits/sysmacros.h bits/types/struct_iovec.h routines := brk sbrk sstk ioctl \ readv writev preadv preadv64 pwritev pwritev64 \ diff --git a/misc/bits/types/struct_iovec.h b/misc/bits/types/struct_iovec.h new file mode 100644 index 0000000..bd625a3 --- /dev/null +++ b/misc/bits/types/struct_iovec.h @@ -0,0 +1,32 @@ +/* Define struct iovec. + Copyright (C) 1996-2017 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 + . */ + +#ifndef __iovec_defined +#define __iovec_defined 1 + +#define __need_size_t +#include + +/* Structure for scatter/gather I/O. */ +struct iovec + { + void *iov_base; /* Pointer to data. */ + size_t iov_len; /* Length of data. */ + }; + +#endif -- cgit v1.1