add pipe2()

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

extra/Configs/Config.in

@@ -915,7 +915,8 @@ config UCLIBC_LINUX_SPECIFIC
 	default y
 	help
 	  capget(), capset(), fstatfs(), inotify_*(), ioperm(), iopl(),
-	  madvise(), modify_ldt(), personality(), prctl()/arch_prctl(),
+	  madvise(), modify_ldt(), pipe2(), personality(),
+	  prctl()/arch_prctl(),
 	  ppoll(), readahead(), reboot(), remap_file_pages(),
 	  sched_getaffinity(), sched_setaffinity(), sendfile(),
 	  setfsgid(), setfsuid(), setresuid(),

include/unistd.h

@@ -389,6 +389,13 @@ extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n,
 extern int pipe (int __pipedes[2]) __THROW __wur;
 libc_hidden_proto(pipe)
 
+#ifdef __USE_GNU
+/* Same as pipe but apply flags passed in FLAGS to the new file
+   descriptors.  */
+extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur;
+libc_hidden_proto(pipe2)
+#endif
+
 /* Schedule an alarm.  In SECONDS seconds, the process will get a SIGALRM.
    If SECONDS is zero, any currently scheduled alarm will be cancelled.
    The function returns the number of seconds remaining until the last

libc/sysdeps/linux/common/Makefile.in

@@ -19,7 +19,8 @@ CSRC-$(UCLIBC_LINUX_MODULE_24) += create_module.c query_module.c \
 	get_kernel_syms.c
 # we need these internally: fstatfs.c statfs.c
 CSRC-$(UCLIBC_LINUX_SPECIFIC) += capget.c capset.c inotify.c ioperm.c iopl.c \
-	madvise.c modify_ldt.c personality.c ppoll.c prctl.c readahead.c reboot.c \
+	madvise.c modify_ldt.c pipe2.c personality.c ppoll.c prctl.c \
+	readahead.c reboot.c \
 	remap_file_pages.c sched_getaffinity.c sched_setaffinity.c \
 	sendfile64.c sendfile.c setfsgid.c setfsuid.c setresuid.c \
 	splice.c vmsplice.c tee.c signalfd.c swapoff.c swapon.c \

libc/sysdeps/linux/common/bits/kernel-features.h

@@ -309,6 +309,19 @@
 # define __ASSUME_O_CLOEXEC 1
 #endif
 
+/* Support for various CLOEXEC and NONBLOCK flags was added for x86,
+ *    x86-64, PPC, IA-64, and SPARC in 2.6.27.  */
+#if __LINUX_KERNEL_VERSION >= 0x02061b \
+    && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
+        || defined __ia64__ || defined __sparc__ || defined __s390__)
+/* # define __ASSUME_SOCK_CLOEXEC  1 */
+/* # define __ASSUME_IN_NONBLOCK   1 */
+# define __ASSUME_PIPE2         1
+/* # define __ASSUME_EVENTFD2      1 */
+/* # define __ASSUME_SIGNALFD4     1 */
+#endif
+
+
 /* These features were surely available with 2.4.12.  */
 #if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
 # define __ASSUME_MMAP2_SYSCALL		1

libc/sysdeps/linux/common/pipe2.c

@@ -0,0 +1,16 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * pipe2() for uClibc
+ *
+ * Copyright (C) 2011 Bernhard Reutner-Fischer <uclibc@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#ifdef __NR_pipe2
+_syscall2(int, pipe2, int *, filedes, int, flags)
+libc_hidden_def(pipe2)
+#endif

libc/sysdeps/linux/common/stubs.c

@@ -31,6 +31,10 @@ static int enosys_stub(void)
 # undef __NR_sync_file_range
 #endif
 
+#ifndef __UCLIBC_LINUX_SPECIFIC__
+# undef __NR_pipe2
+#endif
+
 #ifndef __UCLIBC_HAS_SOCKET__
 # undef __NR_accept
 # undef __NR_accept4
@@ -177,6 +181,10 @@ make_stub(lremovexattr)
 make_stub(lsetxattr)
 #endif
 
+#ifndef __NR_pipe2
+make_stub(pipe2)
+#endif
+
 #ifndef __NR_pivot_root
 make_stub(pivot_root)
 #endif