--with-threads=ucontext portability (was Re: [stunnel-users] stunnel 4.x.x and IRIX)

Eric Haddix wrote:

#0 0x1002a780 in client (arg=0x7) at client.c:106 106 s_log(LOG_DEBUG, "%s started", c->opt->servname);

I have just seen a crash at a similar place on x86_64. The apparent cause is sthreads.c:116: makecontext(&ctx->ctx, (void(*)(void))cli, 1, arg); arg is a void *, but: - the size is given as 1; it should be (sizeof (arg) + sizeof (int) - 1) / sizeof (int) because the "size" is defined as a number of int arguments - it won't work anyway; makecontext () is defined to work only for integer parameters. It is not possible to pass a pointer as integers on x86_64, which uses registers to pass the first 6 integer or pointer parameters.

--with-threads=pthread seems to work fine in my test case. Mirek