On Wed, Mar 27, 2013 at 11:31 AM, Irek Szczesniak <[email protected]> wrote:
[snip]
>>> BTW: The patch currently doesn't cover passing SIGCHLD siginfo data to
>>> the shell traps (this needs to be done in |job_waitsafe()| ... but
>>> that may be tricky).
>>
>> Could you add.sh.status (Exit value or signal) and .sh.pid for CHLD
>> traps, please?
>
> Appending to this RFE:
> We like to have .sh.code for CHLD traps too, with .sh.code being a
> STRING returning one of the CLD_* codes defined in
> http://pubs.opengroup.org/onlinepubs/7908799/xsh/signal.h.html (i.e.
> this is defined by X/OPEN and POSIX and therefore should be applicable
> as shell extension).
Erm... do you mean that you want to be able to write a ksh93 version
of the following C code ?
-- snip --
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
static
const char *sicode2str(int si_code)
{
const char *str;
switch(si_code)
{
#define STRSYM(sym) \
case (sym): str = #sym ; break;
STRSYM(CLD_EXITED)
STRSYM(CLD_KILLED)
STRSYM(CLD_DUMPED)
STRSYM(CLD_TRAPPED)
STRSYM(CLD_STOPPED)
STRSYM(CLD_CONTINUED)
default:
str="<unknown>";
break;
}
return str;
}
static
void chld_handler (int signum, siginfo_t *si,
void *context)
{
printf("#SIGCHLD, si_code=%d/%s handler\n",
si->si_code,
sicode2str(si->si_code));
}
static
void chsleep(void)
{
int i;
for (i=0 ; i < 120 ; i++)
usleep(10000);
}
int main(int ac, char *av[])
{
struct sigaction new_action;
pid_t pid;
/* Setting-up the sigchld handler */
new_action.sa_sigaction = chld_handler;
sigemptyset (&new_action.sa_mask);
new_action.sa_flags = SA_SIGINFO;
sigaction (SIGCHLD, &new_action, NULL);
pid = fork(); /*FIXME: Need error handling*/
if (pid == 0)
{
/* Child process */
puts("# child process "
"(stopping now...)");
raise(SIGSTOP);
puts("# child continues...");
_exit(0);
}
else
{
/* Parent process */
chsleep();
puts("# parent waking child...");
kill(pid, SIGCONT);
chsleep();
}
return EXIT_SUCCESS;
}
-- snip --
The output should look like this:
-- snip --
# child process (stopping now...)
#SIGCHLD, si_code=5/CLD_STOPPED handler
# parent waking child...
# child continues...
#SIGCHLD, si_code=6/CLD_CONTINUED handler
#SIGCHLD, si_code=1/CLD_EXITED handler
-- snip --
This should be technically possible to implement in ksh93... but for
which purpose are you interested in the |CLD_STOPPED|&co. codes ?
----
Bye,
Roland
--
__ . . __
(o.\ \/ /.o) [email protected]
\__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer
/O /==\ O\ TEL +49 641 3992797
(;O/ \/ \O;)
_______________________________________________
ast-developers mailing list
[email protected]
http://lists.research.att.com/mailman/listinfo/ast-developers
