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optimize SOCK_CLOEXEC fallback for socket function

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the fcntl function is heavy, so make the syscall directly instead.
also, avoid the code size and runtime overhead of querying the old
flags, since it's reasonable to assume nothing will be set on a
newly-created socket. this code is only used on old kernels which lack
proper atomic close-on-exec support, so future changes that might
invalidate such an assumption do not need to be considered.
This commit is contained in:
Rich Felker 2014-06-06 15:30:28 -04:00
parent 1d348566e6
commit 1cacc01dc0
1 changed files with 2 additions and 2 deletions
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4
src/network/socket.c
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@ -13,9 +13,9 @@ int socket(int domain, int type, int protocol)
protocol, 0, 0, 0);
if (s < 0) return s;
if (type & SOCK_CLOEXEC)
fcntl(s, F_SETFD, FD_CLOEXEC);
__syscall(SYS_fcntl, s, F_SETFD, FD_CLOEXEC);
if (type & SOCK_NONBLOCK)
fcntl(s, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK);
__syscall(SYS_fcntl, s, F_SETFL, O_NONBLOCK);
}
return s;
}