https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200580
Bug ID: 200580
Summary: superfluous/unnecessary endhostent() does close(0) by
accident. libc resolver dns fd close
Product: Base System
Version: 10.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Calling endhostent(), when such a call is not needed,
ends up closing fd 0 by accident.
main()
{
endhostent();
}
Breakpoint 2, 0x281a8dc0 in close () from /lib/libc.so.7
(gdb) where
#0 0x281a8dc0 in close () from /lib/libc.so.7
#1 0x28152518 in __res_nclose () from /lib/libc.so.7
#2 0x2817c585 in __dns_getanswer () from /lib/libc.so.7
#3 0x080485b3 in main () at endhostent_bug.c:4
hopo $ truss ./a.out
...
close(0) = 0 (0x0)
...
process exit, rval = 0
Except the usual runtime chores, close(0) is the only visible systemcall.
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