Add posix_fadvise(3).

Bug: 12449798
Change-Id: I07cbf3f670a0d1304b68148325a774f266b5c433

libc/Android.mk

@@ -144,6 +144,7 @@ libc_bionic_src_files := \
     bionic/pause.cpp \
     bionic/pipe.cpp \
     bionic/poll.cpp \
+    bionic/posix_fadvise.cpp \
     bionic/posix_fallocate.cpp \
     bionic/posix_timers.cpp \
     bionic/pthread_atfork.cpp \

libc/SYSCALLS.TXT

@@ -167,6 +167,12 @@ void* mmap|mmap64(void*, size_t, int, int, int, off_t)  arm64,mips64,x86_64
 int fallocate64:fallocate(int, int, off64_t, off64_t) arm,mips,x86
 int fallocate|fallocate64(int, int, off_t, off_t) arm64,mips64,x86_64
 
+# posix_fadvise64 is awkward: arm has shuffled arguments,
+# the POSIX functions don't set errno, and no architecture has posix_fadvise.
+int __arm_fadvise64_64:arm_fadvise64_64(int, int, off64_t, off64_t) arm
+int __fadvise64:fadvise64_64(int, off64_t, off64_t, int) mips,x86
+int __fadvise64:fadvise64(int, off64_t, off64_t, int) arm64,mips64,x86_64
+
 int __fstatfs64:fstatfs64(int, size_t, struct statfs*)  arm,mips,x86
 int fstatfs64|fstatfs:fstatfs(int, struct statfs*)  arm64,mips64,x86_64
 int __statfs64:statfs64(const char*, size_t, struct statfs*)  arm,mips,x86

libc/arch-arm/syscalls/__arm_fadvise64_64.S

@@ -0,0 +1,22 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(__arm_fadvise64_64)
+    mov     ip, sp
+    stmfd   sp!, {r4, r5, r6, r7}
+    .cfi_def_cfa_offset 16
+    .cfi_rel_offset r4, 0
+    .cfi_rel_offset r5, 4
+    .cfi_rel_offset r6, 8
+    .cfi_rel_offset r7, 12
+    ldmfd   ip, {r4, r5, r6}
+    ldr     r7, =__NR_arm_fadvise64_64
+    swi     #0
+    ldmfd   sp!, {r4, r5, r6, r7}
+    .cfi_def_cfa_offset 0
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno_internal
+END(__arm_fadvise64_64)

libc/arch-arm64/syscalls/__fadvise64.S

@@ -0,0 +1,15 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(__fadvise64)
+    mov     x8, __NR_fadvise64
+    svc     #0
+
+    cmn     x0, #(MAX_ERRNO + 1)
+    cneg    x0, x0, hi
+    b.hi    __set_errno_internal
+
+    ret
+END(__fadvise64)
+.hidden __fadvise64

libc/arch-mips/syscalls/__fadvise64.S

@@ -0,0 +1,19 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(__fadvise64)
+    .set noreorder
+    .cpload t9
+    li v0, __NR_fadvise64_64
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    la t9,__set_errno_internal
+    j t9
+    nop
+    .set reorder
+END(__fadvise64)

libc/arch-mips64/syscalls/__fadvise64.S

@@ -0,0 +1,26 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(__fadvise64)
+    .set push
+    .set noreorder
+    li v0, __NR_fadvise64
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    move t0, ra
+    bal     2f
+    nop
+2:
+    .cpsetup ra, t1, 2b
+    LA t9,__set_errno_internal
+    .cpreturn
+    j t9
+    move ra, t0
+    .set pop
+END(__fadvise64)
+.hidden __fadvise64

libc/arch-x86/syscalls/__fadvise64.S

@@ -0,0 +1,46 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(__fadvise64)
+    pushl   %ebx
+    .cfi_def_cfa_offset 8
+    .cfi_rel_offset ebx, 0
+    pushl   %ecx
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset ecx, 0
+    pushl   %edx
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset edx, 0
+    pushl   %esi
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset esi, 0
+    pushl   %edi
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset edi, 0
+    pushl   %ebp
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset ebp, 0
+    mov     28(%esp), %ebx
+    mov     32(%esp), %ecx
+    mov     36(%esp), %edx
+    mov     40(%esp), %esi
+    mov     44(%esp), %edi
+    mov     48(%esp), %ebp
+    movl    $__NR_fadvise64_64, %eax
+    int     $0x80
+    cmpl    $-MAX_ERRNO, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno_internal
+    addl    $4, %esp
+1:
+    popl    %ebp
+    popl    %edi
+    popl    %esi
+    popl    %edx
+    popl    %ecx
+    popl    %ebx
+    ret
+END(__fadvise64)

libc/arch-x86_64/syscalls/__fadvise64.S

@@ -0,0 +1,17 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(__fadvise64)
+    movq    %rcx, %r10
+    movl    $__NR_fadvise64, %eax
+    syscall
+    cmpq    $-MAX_ERRNO, %rax
+    jb      1f
+    negl    %eax
+    movl    %eax, %edi
+    call    __set_errno_internal
+1:
+    ret
+END(__fadvise64)
+.hidden __fadvise64

libc/bionic/posix_fadvise.cpp

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2014 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 <fcntl.h>
+
+#include "private/ErrnoRestorer.h"
+
+extern "C" int __arm_fadvise64_64(int, int, off64_t, off64_t);
+extern "C" int __fadvise64(int, off64_t, off64_t, int);
+
+// No architecture actually has the 32-bit off_t system call.
+int posix_fadvise(int fd, off_t offset, off_t length, int advice) {
+  return posix_fadvise64(fd, offset, length, advice);
+}
+
+#if defined(__arm__)
+int posix_fadvise64(int fd, off64_t offset, off64_t length, int advice) {
+  ErrnoRestorer errno_restorer;
+  return (__arm_fadvise64_64(fd, advice, offset, length) == 0) ? 0 : errno;
+}
+#else
+int posix_fadvise64(int fd, off64_t offset, off64_t length, int advice) {
+  ErrnoRestorer errno_restorer;
+  return (__fadvise64(fd, offset, length, advice) == 0) ? 0 : errno;
+}
+#endif

libc/include/fcntl.h

@@ -72,6 +72,8 @@ extern int openat(int, const char*, int, ...);
 extern int openat64(int, const char*, int, ...);
 extern int open(const char*, int, ...);
 extern int open64(const char*, int, ...);
+extern int posix_fadvise64(int, off64_t, off64_t, int);
+extern int posix_fadvise(int, off_t, off_t, int);
 extern int posix_fallocate64(int, off64_t, off64_t);
 extern int posix_fallocate(int, off_t, off_t);
 extern ssize_t splice(int, off64_t*, int, off64_t*, size_t, unsigned int);

tests/fcntl_test.cpp

@@ -70,10 +70,32 @@ TEST(fcntl, creat_creat64) {
   ASSERT_EQ(ENOENT, errno);
 }
 
+TEST(fcntl, posix_fadvise) {
+  TemporaryFile tf;
+  errno = 0;
+
+  EXPECT_EQ(EBADF, posix_fadvise(-1, 0, 0, POSIX_FADV_NORMAL));
+  EXPECT_EQ(0, errno);
+
+  EXPECT_EQ(EBADF, posix_fadvise64(-1, 0, 0, POSIX_FADV_NORMAL));
+  EXPECT_EQ(0, errno);
+
+  EXPECT_EQ(EINVAL, posix_fadvise(tf.fd, 0, 0, -1));
+  EXPECT_EQ(0, errno);
+
+  EXPECT_EQ(EINVAL, posix_fadvise64(tf.fd, 0, 0, -1));
+  EXPECT_EQ(0, errno);
+
+  EXPECT_EQ(0, posix_fadvise(tf.fd, 0, 0, POSIX_FADV_NORMAL));
+  EXPECT_EQ(0, posix_fadvise64(tf.fd, 0, 0, POSIX_FADV_NORMAL));
+}
+
 TEST(fcntl, fallocate_EINVAL) {
   TemporaryFile tf;
 
-#if defined(__BIONIC__)
+  // fallocate/fallocate64 set errno.
+  // posix_fallocate/posix_fallocate64 return an errno value.
+
   errno = 0;
   ASSERT_EQ(-1, fallocate(tf.fd, 0, 0, -1));
   ASSERT_EQ(EINVAL, errno);
@@ -81,7 +103,6 @@ TEST(fcntl, fallocate_EINVAL) {
   errno = 0;
   ASSERT_EQ(-1, fallocate64(tf.fd, 0, 0, -1));
   ASSERT_EQ(EINVAL, errno);
-#endif
 
   errno = 0;
   ASSERT_EQ(EINVAL, posix_fallocate(tf.fd, 0, -1));