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-rw-r--r--nptl/pt-readv.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/nptl/pt-readv.c b/nptl/pt-readv.c
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+/* Copyright (C) 2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ 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 <errno.h>
+#include <stdlib.h>
+#include <sysdep.h>
+#include <sys/uio.h>
+#include "pthreadP.h"
+
+
+/* Not all versions of the kernel support the large number of records. */
+#ifndef UIO_FASTIOV
+# define UIO_FASTIOV 8 /* 8 is a safe number. */
+#endif
+
+
+ssize_t
+readv (fd, vector, count)
+ int fd;
+ const struct iovec *vector;
+ int count;
+{
+ int oldtype;
+ ssize_t result;
+
+ CANCEL_ASYNC (oldtype);
+
+#ifdef INTERNAL_SYSCALL
+ result = INTERNAL_SYSCALL (readv, 3, fd, vector, count);
+ if (INTERNAL_SYSCALL_ERROR_P (result)
+ && __builtin_expect (count > UIO_FASTIOV, 0))
+#elif defined INLINE_SYSCALL
+ result = INLINE_SYSCALL (readv, 3, fd, vector, count);
+ if (result < 0 && errno == EINVAL
+ && __builtin_expect (count > UIO_FASTIOV, 0))
+#endif
+ result = __libc_readv (fd, vector, count);
+
+ CANCEL_RESET (oldtype);
+
+ return result;
+}