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Diffstat (limited to 'base/os_compat_android.cc')
-rw-r--r-- | base/os_compat_android.cc | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/base/os_compat_android.cc b/base/os_compat_android.cc deleted file mode 100644 index b2756b2b22..0000000000 --- a/base/os_compat_android.cc +++ /dev/null @@ -1,176 +0,0 @@ -// Copyright (c) 2012 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -#include "base/os_compat_android.h" - -#include <asm/unistd.h> -#include <errno.h> -#include <math.h> -#include <sys/stat.h> -#include <sys/syscall.h> - -#if !defined(__LP64__) -#include <time64.h> -#endif - -#include "base/rand_util.h" -#include "base/strings/string_piece.h" -#include "base/strings/stringprintf.h" - -extern "C" { -// There is no futimes() avaiable in Bionic, so we provide our own -// implementation until it is there. -int futimes(int fd, const struct timeval tv[2]) { - if (tv == NULL) - return syscall(__NR_utimensat, fd, NULL, NULL, 0); - - if (tv[0].tv_usec < 0 || tv[0].tv_usec >= 1000000 || - tv[1].tv_usec < 0 || tv[1].tv_usec >= 1000000) { - errno = EINVAL; - return -1; - } - - // Convert timeval to timespec. - struct timespec ts[2]; - ts[0].tv_sec = tv[0].tv_sec; - ts[0].tv_nsec = tv[0].tv_usec * 1000; - ts[1].tv_sec = tv[1].tv_sec; - ts[1].tv_nsec = tv[1].tv_usec * 1000; - return syscall(__NR_utimensat, fd, NULL, ts, 0); -} - -#if !defined(__LP64__) -// 32-bit Android has only timegm64() and not timegm(). -// We replicate the behaviour of timegm() when the result overflows time_t. -time_t timegm(struct tm* const t) { - // time_t is signed on Android. - static const time_t kTimeMax = ~(1L << (sizeof(time_t) * CHAR_BIT - 1)); - static const time_t kTimeMin = (1L << (sizeof(time_t) * CHAR_BIT - 1)); - time64_t result = timegm64(t); - if (result < kTimeMin || result > kTimeMax) - return -1; - return result; -} -#endif - -// The following is only needed when building with GCC 4.6 or higher -// (i.e. not with Android GCC 4.4.3, nor with Clang). -// -// GCC is now capable of optimizing successive calls to sin() and cos() into -// a single call to sincos(). This means that source code that looks like: -// -// double c, s; -// c = cos(angle); -// s = sin(angle); -// -// Will generate machine code that looks like: -// -// double c, s; -// sincos(angle, &s, &c); -// -// Unfortunately, sincos() and friends are not part of the Android libm.so -// library provided by the NDK for API level 9. When the optimization kicks -// in, it makes the final build fail with a puzzling message (puzzling -// because 'sincos' doesn't appear anywhere in the sources!). -// -// To solve this, we provide our own implementation of the sincos() function -// and related friends. Note that we must also explicitely tell GCC to disable -// optimizations when generating these. Otherwise, the generated machine code -// for each function would simply end up calling itself, resulting in a -// runtime crash due to stack overflow. -// -#if defined(__GNUC__) && !defined(__clang__) && \ - !defined(ANDROID_SINCOS_PROVIDED) - -// For the record, Clang does not support the 'optimize' attribute. -// In the unlikely event that it begins performing this optimization too, -// we'll have to find a different way to achieve this. NOTE: Tested with O1 -// which still performs the optimization. -// -#define GCC_NO_OPTIMIZE __attribute__((optimize("O0"))) - -GCC_NO_OPTIMIZE -void sincos(double angle, double* s, double *c) { - *c = cos(angle); - *s = sin(angle); -} - -GCC_NO_OPTIMIZE -void sincosf(float angle, float* s, float* c) { - *c = cosf(angle); - *s = sinf(angle); -} - -#endif // __GNUC__ && !__clang__ - -// An implementation of mkdtemp, since it is not exposed by the NDK -// for native API level 9 that we target. -// -// For any changes in the mkdtemp function, you should manually run the unittest -// OsCompatAndroidTest.DISABLED_TestMkdTemp in your local machine to check if it -// passes. Please don't enable it, since it creates a directory and may be -// source of flakyness. -char* mkdtemp(char* path) { - if (path == NULL) { - errno = EINVAL; - return NULL; - } - - const int path_len = strlen(path); - - // The last six characters of 'path' must be XXXXXX. - const base::StringPiece kSuffix("XXXXXX"); - const int kSuffixLen = kSuffix.length(); - if (!base::StringPiece(path, path_len).ends_with(kSuffix)) { - errno = EINVAL; - return NULL; - } - - // If the path contains a directory, as in /tmp/foo/XXXXXXXX, make sure - // that /tmp/foo exists, otherwise we're going to loop a really long - // time for nothing below - char* dirsep = strrchr(path, '/'); - if (dirsep != NULL) { - struct stat st; - int ret; - - *dirsep = '\0'; // Terminating directory path temporarily - - ret = stat(path, &st); - - *dirsep = '/'; // Restoring directory separator - if (ret < 0) // Directory probably does not exist - return NULL; - if (!S_ISDIR(st.st_mode)) { // Not a directory - errno = ENOTDIR; - return NULL; - } - } - - // Max number of tries using different random suffixes. - const int kMaxTries = 100; - - // Now loop until we CAN create a directory by that name or we reach the max - // number of tries. - for (int i = 0; i < kMaxTries; ++i) { - // Fill the suffix XXXXXX with a random string composed of a-z chars. - for (int pos = 0; pos < kSuffixLen; ++pos) { - char rand_char = static_cast<char>(base::RandInt('a', 'z')); - path[path_len - kSuffixLen + pos] = rand_char; - } - if (mkdir(path, 0700) == 0) { - // We just created the directory succesfully. - return path; - } - if (errno != EEXIST) { - // The directory doesn't exist, but an error occured - return NULL; - } - } - - // We reached the max number of tries. - return NULL; -} - -} // extern "C" |