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Must preserve the value of errno; it can be changed by signal handling

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@95 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2007-03-19 16:38:16 +00:00
parent 83857ea52b
commit 006abb3ca3
2 changed files with 33 additions and 3 deletions
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17
arch/c5471/src/up_sigdeliver.c
View File

@ -80,6 +80,13 @@ void up_sigdeliver(void)
uint32 regs[XCPTCONTEXT_REGS];
sig_deliver_t sigdeliver;
/* Save the errno. This must be preserved throughout the
* signal handling so that the the user code final gets
* the correct errno value (probably EINTR).
*/
int saved_errno = rtcb->errno;
up_ledon(LED_SIGNAL);
dbg("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
@ -110,11 +117,19 @@ void up_sigdeliver(void)
sigdeliver(rtcb);
/* Output any debug messaged BEFORE restoreing errno
* (becuase they may alter errno), then restore the
* original errno that is needed by the user logic
* (it is probably EINTR).
*/
dbg("Resuming\n");
rtcb->errno = saved_errno;
/* Then restore the correct state for this thread of
* execution.
*/
up_ledoff(LED_SIGNAL);
dbg("Resuming\n");
up_fullcontextrestore(regs);
}

19
arch/dm320/src/up_sigdeliver.c
View File

@ -77,9 +77,16 @@
void up_sigdeliver(void)
{
_TCB *rtcb = (_TCB*)g_readytorun.head;
uint32 regs[XCPTCONTEST_REGS];
uint32 regs[XCPTCONTEXT_REGS];
sig_deliver_t sigdeliver;
/* Save the errno. This must be preserved throughout the
* signal handling so that the the user code final gets
* the correct errno value (probably EINTR).
*/
int saved_errno = rtcb->errno;
dbg("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
rtcb, rtcb->xcp.sigdeliver, rtcb->sigpendactionq.head);
ASSERT(rtcb->xcp.sigdeliver != NULL);
@ -108,10 +115,18 @@ void up_sigdeliver(void)
sigdeliver(rtcb);
/* Output any debug messaged BEFORE restoreing errno
* (becuase they may alter errno), then restore the
* original errno that is needed by the user logic
* (it is probably EINTR).
*/
dbg("Resuming\n");
rtcb->errno = saved_errno;
/* Then restore the correct state for this thread of
* execution.
*/
dbg("Resuming\n");
up_fullcontextrestore(regs);
}