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xz: Use posix_fadvise() if it is available.

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This commit is contained in:
Lasse Collin 2011-04-05 15:27:26 +03:00
parent 1ef3cf44a8
commit 1039bfcfc0
2 changed files with 18 additions and 0 deletions
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3
configure.ac
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@ -517,6 +517,9 @@ gl_GETOPT
# Find the best function to set timestamps.
AC_CHECK_FUNCS([futimens futimes futimesat utimes utime], [break])
# This is nice to have but not mandatory.
AC_CHECK_FUNCS([posix_fadvise])
TUKLIB_PROGNAME
TUKLIB_INTEGER
TUKLIB_PHYSMEM

15
src/xz/file_io.c
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@ -293,6 +293,10 @@ io_open_src_real(file_pair *pair)
pair->src_fd = STDIN_FILENO;
#ifdef TUKLIB_DOSLIKE
setmode(STDIN_FILENO, O_BINARY);
#endif
#ifdef HAVE_POSIX_FADVISE
// It will fail if stdin is a pipe and that's fine.
(void)posix_fadvise(STDIN_FILENO, 0, 0, POSIX_FADV_SEQUENTIAL);
#endif
return false;
}
@ -497,6 +501,17 @@ io_open_src_real(file_pair *pair)
}
#endif
#ifdef HAVE_POSIX_FADVISE
const int fadvise_ret = posix_fadvise(
pair->src_fd, 0, 0, POSIX_FADV_SEQUENTIAL);
// It shouldn't fail, but if it does anyway, it doesn't matter.
// Check it with an assertion so that if something gets messed
// up in the future, it will get caught when debugging is enabled.
assert(fadvise_ret == 0);
(void)fadvise_ret;
#endif
return false;
error_msg: