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Code Issues Releases Activity

Add signalcontext(), which lays down a signal frame onto a ucontext_t.

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Reviewed by:	deischen, julian
Approved by:	-arch
This commit is contained in:
Jonathan Mini 2002-09-16 19:23:35 +00:00
parent 7b08810243
commit b3466b3fe0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=103405
1 changed files with 15 additions and 12 deletions
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27
lib/libc/gen/swapcontext.c
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@ -27,29 +27,32 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/signal.h>
#include <sys/ucontext.h>
#include <errno.h>
#include <signal.h>
#include <stddef.h>
#include <ucontext.h>
__weak_reference(__swapcontext, swapcontext);
int
__swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
{
volatile int swapping;
int ret;
if (oucp == NULL || ucp == NULL) {
if ((oucp == NULL) ||
(oucp->uc_mcontext.mc_len != sizeof(mcontext_t)) ||
(ucp == NULL) ||
(ucp->uc_mcontext.mc_len != sizeof(mcontext_t))) {
errno = EINVAL;
ret = -1;
} else {
swapping = 0;
ret = getcontext(oucp);
if (ret == 0 && swapping == 0) {
swapping = 1;
ret = setcontext(ucp);
}
return (-1);
}
oucp->uc_flags &= ~UCF_SWAPPED;
ret = getcontext(oucp);
if ((ret == 0) && !(oucp->uc_flags & UCF_SWAPPED)) {
oucp->uc_flags |= UCF_SWAPPED;
ret = setcontext(ucp);
}
return (ret);
}