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shared: always call close() from nm_close() wrapper

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The nm_close() wrapper should behave exactly the same as calling
close() directly. This is well known, documented behavior.

The only addition on top of that, should be the nm_assert() to catch
double-closing.

Prevously, when passing a negative file descriptor, we wouldn't properly
set errno. Also, the call would not show up in strace, which it should
(at least, if libc's close actually makes the syscall).

I would argue, that passing a negative file descriptor is a bug already
and we should never do that. Maybe we should even assert non-negative
fds. I don't do that now, because I am not sufficiently confident.
Anyway, the change should have not practical effect, because we
shouldn't actually pass negative fds already.
This commit is contained in:
Thomas Haller 2017-11-14 14:42:38 +01:00
parent b31118cfd2
commit f4780f85ae
1 changed files with 5 additions and 6 deletions
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11
shared/nm-utils/nm-macros-internal.h
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@ -1246,12 +1246,11 @@ nm_steal_fd (int *p_fd)
static inline int
nm_close (int fd)
{
if (fd >= 0) {
if (close (fd) == 0)
return 0;
nm_assert (errno != EBADF);
}
return -1;
int r;
r = close (fd);
nm_assert (r != -1 || fd < 0 || errno != EBADF);
return r;
}
#endif /* __NM_MACROS_INTERNAL_H__ */