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Avoid hard compilation errors on platforms w/out O_ASYNC

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Those platforms should not be using the sigio notifier in the first
place, this just stops them from failing to be able to compile fish
altogether.

See #6585
This commit is contained in:
Mahmoud Al-Qudsi 2021-02-21 22:39:32 -06:00
parent 9e1cd95eb1
commit 2cf5fd3d5d
1 changed files with 7 additions and 3 deletions
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10
src/env_universal_common.cpp
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@ -1374,9 +1374,13 @@ class universal_notifier_sigio_t final : public universal_notifier_t {
}
// Note that O_ASYNC cannot be passed to open() (see Linux kernel bug #5993).
// We have to set it afterwards like so.
// Also Linux got support for O_ASYNC on fifos in 2.6 (released 2003).
// Do not be noisy if this fails.
if (fcntl(pipe.fd(), F_SETFL, O_NONBLOCK | O_ASYNC) == -1) {
// Linux got support for O_ASYNC on fifos in 2.6 (released 2003). Treat its absence as a
// failure, but don't be noisy if this fails. Non-Linux platforms without O_ASYNC should use
// a different notifier strategy to avoid running into this.
#ifdef O_ASYNC
if (fcntl(pipe.fd(), F_SETFL, O_NONBLOCK | O_ASYNC) == -1)
#endif
{
FLOGF(uvar_file,
_(L"fcntl(F_SETFL) failed, universal variable notifications disabled"));
return autoclose_fd_t{};