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Use explicit information from the kernel to detect the traps due to

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syscall entry and leave.

Based on submision by:	Dan Nelson <dnelson allantgroup com>
MFC after:	1 month
This commit is contained in:
Konstantin Belousov 2011-12-04 18:43:09 +00:00
parent 34f2e649d0
commit 97695ad4cd
1 changed files with 13 additions and 3 deletions
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16
usr.bin/truss/setup.c
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@ -202,9 +202,19 @@ waitevent(struct trussinfo *info)
find_thread(info, lwpinfo.pl_lwpid);
switch(WSTOPSIG(waitval)) {
case SIGTRAP:
info->pr_why = info->curthread->in_syscall?S_SCX:S_SCE;
info->curthread->in_syscall = 1 - info->curthread->in_syscall;
break;
if (lwpinfo.pl_flags & PL_FLAG_SCE) {
info->pr_why = S_SCE;
info->curthread->in_syscall = 1;
break;
} else if (lwpinfo.pl_flags & PL_FLAG_SCX) {
info->pr_why = S_SCX;
info->curthread->in_syscall = 0;
break;
} else {
errx(1,
"pl_flags %x contains neither PL_FLAG_SCE nor PL_FLAG_SCX",
lwpinfo.pl_flags);
}
default:
info->pr_why = S_SIG;
info->pr_data = WSTOPSIG(waitval);