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Date: Wed, 28 Jan 2015 13:42:23 +0100
From: Daniel Cegiełka <>
Subject: Re: getrandom syscall

2015-01-28 13:26 GMT+01:00 Szabolcs Nagy <>:
> * Daniel Cegie??ka <> [2015-01-28 10:10:53 +0100]:
>> 2015-01-28 10:02 GMT+01:00 Szabolcs Nagy <>:
>> >
>> > #ifdef SYS_getrandom
> ...
>> > #endif
>> >
>> > eg sh does not have the syscall (linux is not consistent with
>> > syscalls for whatever reason)
>> SYS_getrandom is defined on musl, so #ifdef SYS_getrandom is not a
>> good solution:
>> It's better to return an error.
> no
> you should return runtime error if the syscall fails
> (eg you are on old kernel that does not support the syscall)
> but you cannot use this code if SYS_getrandom is not
> defined (eg. sh arch) because it will be a musl
> compile time failure (sadly linux does not allocate
> syscall numbers on all archs so musl cannot define
> all SYS_ macros consistently on all archs either)

Indeed. I considered the kernel version check, but it is ugly
approach. #ifdef SYS_getrandom we should add also add to the header
file (stdlib.h?). Is this code will be approved for musl?


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