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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 /elf
parentb7dab1e4d7265fc75a9890cbce897be3f8e4f044 (diff)
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Split _dl_writev out from _dl_debug_vdprintf.
Diffstat (limited to 'elf')
-rw-r--r--elf/dl-misc.c23
-rw-r--r--elf/dl-writev.h56
2 files changed, 59 insertions, 20 deletions
diff --git a/elf/dl-misc.c b/elf/dl-misc.c
index a8e9a3f2f0..e0e105b88f 100644
--- a/elf/dl-misc.c
+++ b/elf/dl-misc.c
@@ -31,7 +31,8 @@
#include <sys/uio.h>
#include <sysdep.h>
#include <_itoa.h>
-#include <bits/libc-lock.h>
+#include <dl-writev.h>
+
/* Read the whole contents of FILE into new mmap'd space with given
protections. *SIZEP gets the size of the file. On error MAP_FAILED
@@ -239,25 +240,7 @@ _dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg)
}
/* Finally write the result. */
-#ifdef HAVE_INLINED_SYSCALLS
- INTERNAL_SYSCALL_DECL (err);
- INTERNAL_SYSCALL (writev, err, 3, fd, &iov, niov);
-#elif RTLD_PRIVATE_ERRNO
- /* We have to take this lock just to be sure we don't clobber the private
- errno when it's being used by another thread that cares about it.
- Yet we must be sure not to try calling the lock functions before
- the thread library is fully initialized. */
- if (__builtin_expect (INTUSE (_dl_starting_up), 0))
- __writev (fd, iov, niov);
- else
- {
- __rtld_lock_lock_recursive (GL(dl_load_lock));
- __writev (fd, iov, niov);
- __rtld_lock_unlock_recursive (GL(dl_load_lock));
- }
-#else
- __writev (fd, iov, niov);
-#endif
+ _dl_writev (fd, iov, niov);
}
diff --git a/elf/dl-writev.h b/elf/dl-writev.h
new file mode 100644
index 0000000000..0fc0b2b864
--- /dev/null
+++ b/elf/dl-writev.h
@@ -0,0 +1,56 @@
+/* Message-writing for the dynamic linker. Generic 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 <ldsodefs.h>
+#include <bits/libc-lock.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)
+{
+ /* Note that if __writev is an implementation that calls malloc,
+ this will cause linking problems building the dynamic linker. */
+
+#if RTLD_PRIVATE_ERRNO
+ /* We have to take this lock just to be sure we don't clobber the private
+ errno when it's being used by another thread that cares about it.
+ Yet we must be sure not to try calling the lock functions before
+ the thread library is fully initialized. */
+ if (__builtin_expect (INTUSE (_dl_starting_up), 0))
+ __writev (fd, iov, niov);
+ else
+ {
+ __rtld_lock_lock_recursive (GL(dl_load_lock));
+ __writev (fd, iov, niov);
+ __rtld_lock_unlock_recursive (GL(dl_load_lock));
+ }
+#else
+ __writev (fd, iov, niov);
+#endif
+}