Date: Thu, 4 Feb 2016 15:54:09 +0100 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: setcontext/getcontext/makecontext missing? * Short, Todd <tshort@...mai.com> [2016-02-04 14:09:30 +0000]: > > It appears that setcontext/getcontext/makecontext are declared in ./include/ucontext.h, but there???s no definitions for them in musl. These three functions are part of libc/glibc.so: > these are deprecated posix apis. > Since the functions are declared, is there any intent to put them into musl? > they have unclear semantics and only possible to implement in asm (hence it is a significant effort to add them). > I ran into this when attempting to compile OpenSSL with musl. In the OpenSSL master branch, I???m able to do: > > CC=musl-gcc ./config > make depend > make > > However, ld fails because there is an undefined reference to setcontext, getcontext and makecontext. This is new async functionality in OpenSSL that uses these APIS. > imho that's an openssl bug. if they really need the *context apis, then use adequate (link-time) configure check for them. but looking at http://git.openssl.org/?p=openssl.git;a=commit;h=a3667c316ae60ef454fb804221c3ca44af30a9aa this async lib is probably misguided, but they can implement the api with pthreads in a portable way. > This is as of musl:master:47314f1 and openssl:master:4c35c93 > > > Thanks, > > -- > -Todd Short > // tshort@...mai.com<mailto:tshort@...mai.com> > // "One if by land, two if by sea, three if by the Internet." >
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