daemon: Do not use 'vfork'.
This fixes random EBADF errors in the daemon on ancient Linux kernels such as version 2.6.32. * config-daemon.ac: Remove detection of 'vfork'.
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@ -78,10 +78,13 @@ if test "x$guix_build_daemon" = "xyes"; then
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dnl lutimes and lchown: used when canonicalizing store items.
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dnl posix_fallocate: used when extracting archives.
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dnl vfork: to speed up spawning of helper programs.
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dnl `--> now disabled because of unpredictable behavior:
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dnl see <http://lists.gnu.org/archive/html/guix-devel/2014-05/msg00036.html>
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dnl and Nix commit f794465c (Nov. 2012).
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dnl sched_setaffinity: to improve RPC locality.
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dnl statvfs: to detect disk-full conditions.
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dnl strsignal: for error reporting.
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AC_CHECK_FUNCS([lutimes lchown posix_fallocate vfork sched_setaffinity \
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AC_CHECK_FUNCS([lutimes lchown posix_fallocate sched_setaffinity \
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statvfs nanosleep strsignal])
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dnl Check whether the store optimiser can optimise symlinks.
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