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authorRoland McGrath <roland@hack.frob.com>2013-05-06 11:30:41 -0700
committerRoland McGrath <roland@hack.frob.com>2013-05-06 11:30:41 -0700
commitd5e8275481e57cc7f3bd6ba435a7bbced9b97202 (patch)
treedd10221ec817a1920c159ea44a5643bd15e0b35f /sysdeps/unix
parentb7dab1e4d7265fc75a9890cbce897be3f8e4f044 (diff)
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Split _dl_writev out from _dl_debug_vdprintf.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r--sysdeps/unix/sysv/linux/dl-writev.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/dl-writev.h b/sysdeps/unix/sysv/linux/dl-writev.h
new file mode 100644
index 0000000..b682e0c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/dl-writev.h
@@ -0,0 +1,38 @@
+/* Message-writing for the dynamic linker. Linux version.
+ Copyright (C) 2013 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 <sysdep.h>
+
+/* This is used from only one place: dl-misc.c:_dl_debug_vdprintf.
+ Hence it's in a header with the expectation it will be inlined.
+
+ This is writev, but with a constraint added and others loosened:
+
+ 1. Under RTLD_PRIVATE_ERRNO, it must not clobber the private errno
+ when another thread holds the dl_load_lock.
+ 2. It is not obliged to detect and report errors at all.
+ 3. It's not really obliged to deliver a single atomic write
+ (though it may be preferable). */
+
+static inline void
+_dl_writev (int fd, const struct iovec *iov, size_t niov)
+{
+ INTERNAL_SYSCALL_DECL (err);
+ INTERNAL_SYSCALL (writev, err, 3, fd, iov, niov);
+}