libucontext/libucontext_posix.c

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/*
* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
#include <stddef.h>
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#include <stdio.h>
#include <signal.h>
#include <libucontext/libucontext.h>
#ifdef FREESTANDING
# error libucontext_posix cannot be built in FREESTANDING mode.
#endif
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#ifdef DEBUG
# define TRACE(...) fprintf(stderr, "TRACE: " __VA_ARGS__)
#else
# define TRACE(...)
#endif
int
getcontext(libucontext_ucontext_t *ucp)
{
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TRACE("getcontext(%p)\n", ucp);
if (sigprocmask(SIG_SETMASK, NULL, &ucp->uc_sigmask))
return -1;
return libucontext_getcontext(ucp);
}
int
setcontext(const libucontext_ucontext_t *ucp)
{
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TRACE("setcontext(%p)\n", ucp);
if (sigprocmask(SIG_SETMASK, &ucp->uc_sigmask, NULL))
return -1;
return libucontext_setcontext(ucp);
}
int
swapcontext(libucontext_ucontext_t *oucp, const libucontext_ucontext_t *ucp)
{
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TRACE("swapcontext(%p, %p)\n", oucp, ucp);
if (sigprocmask(SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask))
return -1;
return libucontext_swapcontext(oucp, ucp);
}