diff --git a/libc/Android.mk b/libc/Android.mk
index edf834b..45297b5 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -284,6 +284,7 @@
     bionic/raise.cpp \
     bionic/__set_errno.cpp \
     bionic/setlocale.cpp \
+    bionic/signalfd.cpp \
     bionic/__strcat_chk.cpp \
     bionic/__strcpy_chk.cpp \
     bionic/strerror.cpp \
diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 2973caa..dc139bd 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -225,6 +225,7 @@
 int     __rt_sigprocmask:rt_sigprocmask (int  how, const sigset_t *set, sigset_t *oset, size_t sigsetsize)  175,175,195
 int     __rt_sigtimedwait:rt_sigtimedwait(const sigset_t *set, struct siginfo_t  *info, struct timespec_t  *timeout, size_t  sigset_size)  177,177,197
 int     sigpending(sigset_t *)  73
+int     signalfd4(int fd, const sigset_t *mask, size_t sizemask, int flags)  355,327,324
 
 # sockets
 int           socket(int, int, int)              281,-1,183
diff --git a/libc/arch-arm/syscalls.mk b/libc/arch-arm/syscalls.mk
index 62eda87..5cb46b5 100644
--- a/libc/arch-arm/syscalls.mk
+++ b/libc/arch-arm/syscalls.mk
@@ -150,6 +150,7 @@
 syscall_src += arch-arm/syscalls/__rt_sigprocmask.S
 syscall_src += arch-arm/syscalls/__rt_sigtimedwait.S
 syscall_src += arch-arm/syscalls/sigpending.S
+syscall_src += arch-arm/syscalls/signalfd4.S
 syscall_src += arch-arm/syscalls/socket.S
 syscall_src += arch-arm/syscalls/socketpair.S
 syscall_src += arch-arm/syscalls/bind.S
diff --git a/libc/arch-arm/syscalls/signalfd4.S b/libc/arch-arm/syscalls/signalfd4.S
new file mode 100644
index 0000000..1ec7055
--- /dev/null
+++ b/libc/arch-arm/syscalls/signalfd4.S
@@ -0,0 +1,14 @@
+/* autogenerated by gensyscalls.py */
+#include <machine/asm.h>
+#include <sys/linux-syscalls.h>
+
+ENTRY(signalfd4)
+    .save   {r4, r7}
+    stmfd   sp!, {r4, r7}
+    ldr     r7, =__NR_signalfd4
+    swi     #0
+    ldmfd   sp!, {r4, r7}
+    movs    r0, r0
+    bxpl    lr
+    b       __set_syscall_errno
+END(signalfd4)
diff --git a/libc/arch-mips/syscalls.mk b/libc/arch-mips/syscalls.mk
index 263f307..7e40c2e 100644
--- a/libc/arch-mips/syscalls.mk
+++ b/libc/arch-mips/syscalls.mk
@@ -153,6 +153,7 @@
 syscall_src += arch-mips/syscalls/__rt_sigprocmask.S
 syscall_src += arch-mips/syscalls/__rt_sigtimedwait.S
 syscall_src += arch-mips/syscalls/sigpending.S
+syscall_src += arch-mips/syscalls/signalfd4.S
 syscall_src += arch-mips/syscalls/socket.S
 syscall_src += arch-mips/syscalls/socketpair.S
 syscall_src += arch-mips/syscalls/bind.S
diff --git a/libc/arch-mips/syscalls/signalfd4.S b/libc/arch-mips/syscalls/signalfd4.S
new file mode 100644
index 0000000..7e4082c
--- /dev/null
+++ b/libc/arch-mips/syscalls/signalfd4.S
@@ -0,0 +1,22 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+    .text
+    .globl signalfd4
+    .align 4
+    .ent signalfd4
+
+signalfd4:
+    .set noreorder
+    .cpload $t9
+    li $v0, __NR_signalfd4
+    syscall
+    bnez $a3, 1f
+    move $a0, $v0
+    j $ra
+    nop
+1:
+    la $t9,__set_errno
+    j $t9
+    nop
+    .set reorder
+    .end signalfd4
diff --git a/libc/arch-x86/syscalls.mk b/libc/arch-x86/syscalls.mk
index 2517ebf..e196c02 100644
--- a/libc/arch-x86/syscalls.mk
+++ b/libc/arch-x86/syscalls.mk
@@ -154,6 +154,7 @@
 syscall_src += arch-x86/syscalls/__rt_sigprocmask.S
 syscall_src += arch-x86/syscalls/__rt_sigtimedwait.S
 syscall_src += arch-x86/syscalls/sigpending.S
+syscall_src += arch-x86/syscalls/signalfd4.S
 syscall_src += arch-x86/syscalls/socket.S
 syscall_src += arch-x86/syscalls/bind.S
 syscall_src += arch-x86/syscalls/connect.S
diff --git a/libc/arch-x86/syscalls/signalfd4.S b/libc/arch-x86/syscalls/signalfd4.S
new file mode 100644
index 0000000..f1c2ea0
--- /dev/null
+++ b/libc/arch-x86/syscalls/signalfd4.S
@@ -0,0 +1,32 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type signalfd4, @function
+    .globl signalfd4
+    .align 4
+
+signalfd4:
+    pushl   %ebx
+    pushl   %ecx
+    pushl   %edx
+    pushl   %esi
+    mov     20(%esp), %ebx
+    mov     24(%esp), %ecx
+    mov     28(%esp), %edx
+    mov     32(%esp), %esi
+    movl    $__NR_signalfd4, %eax
+    int     $0x80
+    cmpl    $-129, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno
+    addl    $4, %esp
+    orl     $-1, %eax
+1:
+    popl    %esi
+    popl    %edx
+    popl    %ecx
+    popl    %ebx
+    ret
diff --git a/libc/bionic/signalfd.cpp b/libc/bionic/signalfd.cpp
new file mode 100644
index 0000000..51fae83
--- /dev/null
+++ b/libc/bionic/signalfd.cpp
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/signalfd.h>
+
+/* Despite the fact that our kernel headers define sigset_t explicitly
+ * as a 32-bit integer, the kernel system call really expects a 64-bit
+ * bitmap for the signal set, or more exactly an array of two-32-bit
+ * values (see $KERNEL/arch/$ARCH/include/asm/signal.h for details).
+ *
+ * Unfortunately, we cannot fix the sigset_t definition without breaking
+ * the C library ABI, so perform a little runtime translation here.
+ */
+typedef union {
+    sigset_t   bionic;
+    uint32_t   kernel[2];
+} kernel_sigset_t;
+
+extern "C" int signalfd4(int fd, kernel_sigset_t *mask, size_t sizemask, int flags);
+
+int signalfd(int fd, const sigset_t *mask, int flags)
+{
+    kernel_sigset_t in_set;
+    in_set.kernel[0] = in_set.kernel[1] = 0;
+
+    in_set.bionic = *mask;
+
+    return signalfd4(fd, &in_set, sizeof(in_set), flags);
+}
diff --git a/libc/include/sys/linux-syscalls.h b/libc/include/sys/linux-syscalls.h
index ec48ada..738d9e8 100644
--- a/libc/include/sys/linux-syscalls.h
+++ b/libc/include/sys/linux-syscalls.h
@@ -173,6 +173,7 @@
 #define __NR_rt_sigaction                 (__NR_SYSCALL_BASE + 174)
 #define __NR_rt_sigprocmask               (__NR_SYSCALL_BASE + 175)
 #define __NR_rt_sigtimedwait              (__NR_SYSCALL_BASE + 177)
+#define __NR_signalfd4                    (__NR_SYSCALL_BASE + 355)
 #define __NR_socket                       (__NR_SYSCALL_BASE + 281)
 #define __NR_socketpair                   (__NR_SYSCALL_BASE + 288)
 #define __NR_bind                         (__NR_SYSCALL_BASE + 282)
@@ -329,6 +330,7 @@
 #define __NR_unshare                      (__NR_SYSCALL_BASE + 310)
 #define __NR_getcpu                       (__NR_SYSCALL_BASE + 318)
 #define __NR_utimensat                    (__NR_SYSCALL_BASE + 320)
+#define __NR_signalfd4                    (__NR_SYSCALL_BASE + 327)
 #define __NR_eventfd2                     (__NR_SYSCALL_BASE + 328)
 #define __NR_pipe2                        (__NR_SYSCALL_BASE + 331)
 #define __NR_perf_event_open              (__NR_SYSCALL_BASE + 336)
@@ -463,6 +465,7 @@
 #define __NR_ioprio_set                   (__NR_SYSCALL_BASE + 314)
 #define __NR_ioprio_get                   (__NR_SYSCALL_BASE + 315)
 #define __NR_utimensat                    (__NR_SYSCALL_BASE + 316)
+#define __NR_signalfd4                    (__NR_SYSCALL_BASE + 324)
 #define __NR_eventfd2                     (__NR_SYSCALL_BASE + 325)
 #define __NR_pipe2                        (__NR_SYSCALL_BASE + 328)
 #define __NR_perf_event_open              (__NR_SYSCALL_BASE + 333)
diff --git a/libc/include/sys/signalfd.h b/libc/include/sys/signalfd.h
new file mode 100644
index 0000000..af1f290
--- /dev/null
+++ b/libc/include/sys/signalfd.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _SYS_SIGNALFD_H_
+#define _SYS_SIGNALFD_H_
+
+#include <linux/signalfd.h>
+#include <sys/cdefs.h>
+#include <signal.h>
+
+__BEGIN_DECLS
+
+/* Compatibility with GLibc */
+extern int signalfd(int fd, const sigset_t *mask, int flags);
+
+__END_DECLS
+
+#endif /* _SYS_SIGNALFD_H */
diff --git a/libc/kernel/common/linux/signalfd.h b/libc/kernel/common/linux/signalfd.h
new file mode 100644
index 0000000..a064192
--- /dev/null
+++ b/libc/kernel/common/linux/signalfd.h
@@ -0,0 +1,51 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _LINUX_SIGNALFD_H
+#define _LINUX_SIGNALFD_H
+#include <linux/types.h>
+#include <linux/fcntl.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SFD_CLOEXEC O_CLOEXEC
+#define SFD_NONBLOCK O_NONBLOCK
+struct signalfd_siginfo {
+ __u32 ssi_signo;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __s32 ssi_errno;
+ __s32 ssi_code;
+ __u32 ssi_pid;
+ __u32 ssi_uid;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __s32 ssi_fd;
+ __u32 ssi_tid;
+ __u32 ssi_band;
+ __u32 ssi_overrun;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u32 ssi_trapno;
+ __s32 ssi_status;
+ __s32 ssi_int;
+ __u64 ssi_ptr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u64 ssi_utime;
+ __u64 ssi_stime;
+ __u64 ssi_addr;
+ __u16 ssi_addr_lsb;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u8 __pad[46];
+};
+#endif