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authorBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2015-03-22 14:47:29 +0100
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2015-03-22 14:49:27 +0100
commit09ff424905d5de0b2a21a3960d9756a90b07ba26 (patch)
treeb927d20d8fa53c98cc5b08b6826096d43c387d28 /libc/sysdeps
parent534f44d53146457b3ca686c47efb9207543b88e1 (diff)
libc: add getrandom(2)
Introduce a <sys/random.h> for it. /* FIXME: aren't there a couple of __restrict and const missing ? */ extern int getrandom(void *__buf, size_t count, unsigned int flags) __nonnull ((1)) __wur; Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'libc/sysdeps')
-rw-r--r--libc/sysdeps/linux/common/Makefile.in1
-rw-r--r--libc/sysdeps/linux/common/bits/kernel-features.h5
-rw-r--r--libc/sysdeps/linux/common/getrandom.c14
-rw-r--r--libc/sysdeps/linux/common/stubs.c4
-rw-r--r--libc/sysdeps/linux/common/sys/random.h33
5 files changed, 57 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/Makefile.in b/libc/sysdeps/linux/common/Makefile.in
index 8ee956b6b..82525984a 100644
--- a/libc/sysdeps/linux/common/Makefile.in
+++ b/libc/sysdeps/linux/common/Makefile.in
@@ -27,6 +27,7 @@ CSRC-$(UCLIBC_LINUX_SPECIFIC) += \
eventfd.c \
eventfd_read.c \
eventfd_write.c \
+ getrandom.c \
inotify.c \
ioperm.c \
iopl.c \
diff --git a/libc/sysdeps/linux/common/bits/kernel-features.h b/libc/sysdeps/linux/common/bits/kernel-features.h
index 6184c2b9d..708bb4906 100644
--- a/libc/sysdeps/linux/common/bits/kernel-features.h
+++ b/libc/sysdeps/linux/common/bits/kernel-features.h
@@ -507,3 +507,8 @@
#if defined __x86_64__ && __LINUX_KERNEL_VERSION >= 0x030100
# define __ASSUME_GETCPU_SYSCALL 1
#endif
+
+/* getrandom syscall (widely) appeared around 4.0.0 */
+#if __LINUX_KERNEL_VERSION >= 0x040000
+# define __ASSUME_GETRANDOM_SYSCALL 1
+#endif
diff --git a/libc/sysdeps/linux/common/getrandom.c b/libc/sysdeps/linux/common/getrandom.c
new file mode 100644
index 000000000..d33d5224a
--- /dev/null
+++ b/libc/sysdeps/linux/common/getrandom.c
@@ -0,0 +1,14 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * getrandom() for uClibc
+ *
+ * Copyright (C) 2015 Bernhard Reutner-Fischer
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <sys/random.h>
+#ifdef __NR_getrandom
+_syscall3(int, getrandom, void *, buf, size_t, buflen, unsigned int, flags)
+#endif
diff --git a/libc/sysdeps/linux/common/stubs.c b/libc/sysdeps/linux/common/stubs.c
index 2c50307aa..19a33714a 100644
--- a/libc/sysdeps/linux/common/stubs.c
+++ b/libc/sysdeps/linux/common/stubs.c
@@ -157,6 +157,10 @@ make_stub(getpeername)
make_stub(getpgrp)
#endif
+#if !defined __NR_getrandom && defined __UCLIBC_LINUX_SPECIFIC__
+make_stub(getrandom)
+#endif
+
#if !defined __NR_getsockname && !defined __NR_socketcall && defined __UCLIBC_HAS_SOCKET__
make_stub(getsockname)
#endif
diff --git a/libc/sysdeps/linux/common/sys/random.h b/libc/sysdeps/linux/common/sys/random.h
new file mode 100644
index 000000000..42f802576
--- /dev/null
+++ b/libc/sysdeps/linux/common/sys/random.h
@@ -0,0 +1,33 @@
+/* Copyright (C) 2015 Bernhard Reutner-Fischer
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+*/
+
+#ifndef _SYS_RANDOM_H
+#define _SYS_RANDOM_H 1
+#include <features.h>
+
+__BEGIN_DECLS
+
+#if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
+# if 0 /*def __ASSUME_GETRANDOM_SYSCALL */
+# include <linux/random.h>
+# else
+# undef GRND_NONBLOCK
+# undef GRND_RANDOM
+/*
+ * Flags for getrandom(2)
+ *
+ * GRND_NONBLOCK Don't block and return EAGAIN instead
+ * GRND_RANDOM Use the /dev/random pool instead of /dev/urandom
+ */
+# define GRND_NONBLOCK 0x0001
+# define GRND_RANDOM 0x0002
+# endif
+/* FIXME: aren't there a couple of __restrict and const missing ? */
+extern int getrandom(void *__buf, size_t count, unsigned int flags)
+ __nonnull ((1)) __wur;
+#endif
+
+__END_DECLS
+
+#endif /* sys/random.h */