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b4722cc4c9
mkstemp is guaranteed to make at least TMP_MAX attempts to create the random file, and if it can't, it fails with EEXIST. get_temp_file_name shouldn't call mkstemp again if it fails with anything other than EEXIST. A single mkstemp call seems sufficient. On Android, I've seen mkstemp fail with: - EROFS (because cwd wasn't set to a writable filesystem) - EACCES (because cwd pointed to a dir owned by root, but the test program was running as the shell user instead) Previously, get_temp_file_name would run forever in these situations. See D4962 and "llvm-svn: 229035" Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D130214
115 lines
3.1 KiB
C++
115 lines
3.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Define a bunch of macros that can be used in the tests instead of
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// implementation defined assumptions:
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// - locale names
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// - floating point number string output
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#ifndef PLATFORM_SUPPORT_H
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#define PLATFORM_SUPPORT_H
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#include "test_macros.h"
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// locale names
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#define LOCALE_en_US "en_US"
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#define LOCALE_en_US_UTF_8 "en_US.UTF-8"
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#define LOCALE_fr_FR_UTF_8 "fr_FR.UTF-8"
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#ifdef __linux__
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# define LOCALE_fr_CA_ISO8859_1 "fr_CA.ISO-8859-1"
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# define LOCALE_cs_CZ_ISO8859_2 "cs_CZ.ISO-8859-2"
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#elif defined(_WIN32)
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# define LOCALE_fr_CA_ISO8859_1 "fr-CA"
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# define LOCALE_cs_CZ_ISO8859_2 "cs-CZ"
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#else
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# define LOCALE_fr_CA_ISO8859_1 "fr_CA.ISO8859-1"
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# define LOCALE_cs_CZ_ISO8859_2 "cs_CZ.ISO8859-2"
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#endif
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#define LOCALE_ja_JP_UTF_8 "ja_JP.UTF-8"
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#define LOCALE_ru_RU_UTF_8 "ru_RU.UTF-8"
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#define LOCALE_zh_CN_UTF_8 "zh_CN.UTF-8"
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#include <stdio.h>
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#include <stdlib.h>
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#include <codecvt>
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#include <locale>
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#include <string>
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#if defined(_WIN32)
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# include <io.h> // _mktemp_s
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# include <fcntl.h> // _O_EXCL, ...
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# include <sys/stat.h> // _S_IREAD, ...
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#else
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# include <unistd.h> // close
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#endif
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#if defined(_CS_GNU_LIBC_VERSION)
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# include <string.h> // strverscmp
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#endif
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#if defined(_NEWLIB_VERSION) && defined(__STRICT_ANSI__)
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// Newlib provides this, but in the header it's under __STRICT_ANSI__
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extern "C" {
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int mkstemp(char*);
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}
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#endif
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inline
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std::string get_temp_file_name()
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{
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#if defined(_WIN32)
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while (true) {
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char Name[] = "libcxx.XXXXXX";
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if (_mktemp_s(Name, sizeof(Name)) != 0) abort();
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int fd = _open(Name, _O_RDWR | _O_CREAT | _O_EXCL, _S_IREAD | _S_IWRITE);
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if (fd != -1) {
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_close(fd);
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return Name;
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}
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if (errno == EEXIST)
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continue;
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abort();
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}
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#else
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std::string Name = "libcxx.XXXXXX";
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int FD = mkstemp(&Name[0]);
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if (FD == -1) {
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perror("mkstemp");
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abort();
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}
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close(FD);
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return Name;
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#endif
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}
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
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inline
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std::wstring get_wide_temp_file_name()
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{
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return std::wstring_convert<std::codecvt_utf8_utf16<wchar_t> >().from_bytes(
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get_temp_file_name());
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}
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#endif // _LIBCPP_HAS_OPEN_WITH_WCHAR
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_LIBCPP_SUPPRESS_DEPRECATED_POP
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#if defined(_CS_GNU_LIBC_VERSION)
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inline bool glibc_version_less_than(char const* version) {
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std::string test_version = std::string("glibc ") + version;
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size_t n = confstr(_CS_GNU_LIBC_VERSION, nullptr, (size_t)0);
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char *current_version = new char[n];
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confstr(_CS_GNU_LIBC_VERSION, current_version, n);
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bool result = strverscmp(current_version, test_version.c_str()) < 0;
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delete[] current_version;
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return result;
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}
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#endif // _CS_GNU_LIBC_VERSION
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#endif // PLATFORM_SUPPORT_H
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