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Merge #18437: util: Detect posix_fallocate() instead of assuming

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182dbdf0f4b6e6484b0d4588aaefacc75862a99c util: Detect posix_fallocate() instead of assuming (Vasil Dimov)

Pull request description:

  Don't assume that `posix_fallocate()` is available on Linux and not
  available on other operating systems. At least FreeBSD has it and we
  are not using it.

  Properly check whether `posix_fallocate()` is present and use it if it
  is.

ACKs for top commit:
  laanwj:
    ACK 182dbdf0f4b6e6484b0d4588aaefacc75862a99c

Tree-SHA512: f9ed4bd661f33ff6b2b1150591e860b3c1f44e12b87c35e870d06a7013c4e841ed2bf17b41ad6b18fe471b0b23a4b5e42cf1400637180888e0bc56c254fe0766
This commit is contained in:
Wladimir J. van der Laan 2020-04-30 10:44:20 +02:00 committed by Vijay Das Manikpuri
parent 5ef0a3c1a7
commit c49e573e47
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GPG Key ID: DB1D81B01DB7C46E
2 changed files with 18 additions and 2 deletions
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16
configure.ac
View File

@ -990,6 +990,22 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <malloc.h>]],
[ AC_MSG_RESULT(no)]
)
dnl Check for posix_fallocate
AC_MSG_CHECKING(for posix_fallocate)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
// same as in src/util/system.cpp
#ifdef __linux__
#ifdef _POSIX_C_SOURCE
#undef _POSIX_C_SOURCE
#endif
#define _POSIX_C_SOURCE 200112L
#endif // __linux__
#include <fcntl.h>]],
[[ int f = posix_fallocate(0, 0, 0); ]])],
[ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_POSIX_FALLOCATE, 1,[Define this symbol if you have posix_fallocate]) ],
[ AC_MSG_RESULT(no)]
)
AC_MSG_CHECKING([for visibility attribute])
AC_LINK_IFELSE([AC_LANG_SOURCE([
int foo_def( void ) __attribute__((visibility("default")));

4
src/util/system.cpp
View File

@ -22,7 +22,7 @@
#endif
#ifndef WIN32
// for posix_fallocate
// for posix_fallocate, in configure.ac we check if it is present after this
#ifdef __linux__
#ifdef _POSIX_C_SOURCE
@ -1170,7 +1170,7 @@ void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
}
ftruncate(fileno(file), static_cast<off_t>(offset) + length);
#else
#if defined(__linux__)
#if defined(HAVE_POSIX_FALLOCATE)
// Version using posix_fallocate
off_t nEndPos = (off_t)offset + length;
if (0 == posix_fallocate(fileno(file), 0, nEndPos)) return;