Date: Thu, 13 Dec 2018 00:11:21 -0500 From: Andrew Kelley <andrew@ziglang.org> To: freebsd-hackers@freebsd.org Subject: raise() implementation in freebsd libc vs musl libc Message-ID: <70c7214e-3619-115d-abca-09853a1729a6@ziglang.org>
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From: Andrew Kelley <andrew@ziglang.org>
To: freebsd-hackers@freebsd.org
Message-ID: <70c7214e-3619-115d-abca-09853a1729a6@ziglang.org>
Subject: raise() implementation in freebsd libc vs musl libc
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Howdy,
I noticed that musl-libc blocks signals in raise() to prevent a race
condition, but freebsd libc does not. is there a reason it's necessary
on linux and not freebsd?
musl
int raise(int sig)
{
sigset_t set;
__block_app_sigs(&set);
int ret =3D syscall(SYS_tkill, __pthread_self()->tid, sig);
__restore_sigs(&set);
return ret;
}
freebsd
int
__raise(int s)
{
long id;
if (__sys_thr_self(&id) =3D=3D -1)
return (-1);
return (__sys_thr_kill(id, s));
}
Regards,
Andrew
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