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authorRich Felker <dalias@aerifal.cx>2012-09-29 17:36:27 -0400
committerRich Felker <dalias@aerifal.cx>2012-09-29 17:36:27 -0400
commit79a5e73e518213d5e77a06cfc0db74ffbf7922c6 (patch)
treea13e64b58de93ae8a94787414007c4db0d72843d /src/unistd
parent3d8d90c5ccf66f1d243cb1b248b047295c197b5c (diff)
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emulate SOCK_CLOEXEC and SOCK_NONBLOCK for old (pre-2.6.27) kernels
also update syslog to use SOCK_CLOEXEC rather than separate fcntl
step, to make it safe in multithreaded programs that run external
programs.

emulation is not atomic; it could be made atomic by holding a lock on
forking during the operation, but this seems like overkill. my goal is
not to achieve perfect behavior on old kernels (which have plenty of
other imperfect behavior already) but to avoid catastrophic breakage
in (1) syslog, which would give no output on old kernels with the
change to use SOCK_CLOEXEC, and (2) programs built on a new kernel
where configure scripts detected a working SOCK_CLOEXEC, which later
get run on older kernels (they may otherwise fail to work completely).
Diffstat (limited to 'src/unistd')
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