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Date: Wed, 29 Aug 2012 19:44:30 +1000
From: Erik de Castro Lopo <mle+tools@mega-nerd.com>
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Subject: [Qemu-devel] Posix timer syscalls [Bug 1042388]
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To: qemu-devel@nongnu.org

Hi all,

I've spent some time messing about in linux-user/syscall.c and I have
stubs for all 5 posix timer syscalls:

    int timer_create(clockid_t clockid, struct sigevent *sevp,
                     timer_t *timerid);

    int timer_settime(timer_t timerid, int flags,
                      const struct itimerspec *new_value,
                      struct itimerspec * old_value);

    int timer_gettime(timer_t timerid, struct itimerspec *curr_value);

    int timer_getoverrun(timer_t timerid);

    int timer_delete(timer_t timerid);

Obviously all these parameters need to be converted between host and
target. I've already found struct target_itimerspec in
linux-user/syscall_defs.h and that looks like it will be useful.

I'm having trouble struct sigevent pointer that is passed to
timer_create() which is defined as:

    typedef struct sigevent {
        sigval_t sigev_value;
        int sigev_signo;
        int sigev_notify;
        union {
            int _pad[SIGEV_PAD_SIZE];
            int _tid;

            struct {
                void (*_function)(sigval_t);
                void *_attribute;	/* really pthread_attr_t */
            } _sigev_thread;
        } _sigev_un;
    } sigevent_t;

Any ideas on how to handle the union within this struct?

Cheers,
Erik
-- 
----------------------------------------------------------------------
Erik de Castro Lopo
http://www.mega-nerd.com/