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Revert "xz: Use pipe2() if available."

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This reverts commit 7a11c4a8e5.
It is a problem when libc has pipe2() but the kernel is too
old to have pipe2() and thus pipe2() fails. In xz it's pointless
to have a fallback for non-functioning pipe2(); it's better to
avoid pipe2() completely.

Thanks to Michael Fox for the bug report.
This commit is contained in:
Lasse Collin 2015-04-20 19:59:18 +03:00
parent eccd8155e1
commit db190a832c
2 changed files with 3 additions and 10 deletions
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4
configure.ac
View file

@ -626,8 +626,8 @@ gl_GETOPT
# Find the best function to set timestamps.
AC_CHECK_FUNCS([futimens futimes futimesat utimes utime], [break])
# These are nice to have but not mandatory.
AC_CHECK_FUNCS([posix_fadvise pipe2])
# This is nice to have but not mandatory.
AC_CHECK_FUNCS([posix_fadvise])
TUKLIB_PROGNAME
TUKLIB_INTEGER

9
src/xz/file_io.c
View file

@ -82,13 +82,7 @@ io_init(void)
// we are root.
warn_fchown = geteuid() == 0;
// Create a pipe for the self-pipe trick. If pipe2() is available,
// we can avoid the fcntl() calls.
# ifdef HAVE_PIPE2
if (pipe2(user_abort_pipe, O_NONBLOCK))
message_fatal(_("Error creating a pipe: %s"),
strerror(errno));
# else
// Create a pipe for the self-pipe trick.
if (pipe(user_abort_pipe))
message_fatal(_("Error creating a pipe: %s"),
strerror(errno));
@ -101,7 +95,6 @@ io_init(void)
message_fatal(_("Error creating a pipe: %s"),
strerror(errno));
}
# endif
#endif
#ifdef __DJGPP__