DCMD_PROC_EVENT
QNX SDP8.0Programmer's GuideDeveloper
Define an event to be delivered when the process associated with the file descriptor reaches a point of interest.
#include <sys/procfs.h>
#define DCMD_PROC_EVENT (__DIOT(_DCMD_PROC, __PROC_SUBCMD_PROCFS + 17, struct sigevent))
The arguments to devctl() are:
| Argument | Value |
|---|---|
| filedes | A file descriptor for the process. |
| dcmd | DCMD_PROC_EVENT |
| dev_data_ptr | A pointer to a struct sigevent |
| n_bytes | sizeof(struct sigevent) |
| dev_info_ptr | NULL |
Use the DCMD_PROC_RUN command to set up the point of interest.
Note:
The DCMD_PROC_EVENT command won't work unless you've set
_DEBUG_RUN_ARM in the flags field of
the procfs_run structure for the DCMD_PROC_RUN command.
The event command also won't work after the corresponding file descriptor has been closed.
The DCMD_PROC_EVENT command doesn't block the calling process.
The argument is a pointer to the sigevent that you want to be delivered at the appropriate time. The application must register the event by calling MsgRegisterEvent() with SYSMGR_COID passed as the connection ID (coid) or with the file descriptor obtained from opening the process control path. For example:
struct sigevent event;
// Define a sigevent for process stopped notification.
event.sigev_notify = SIGEV_SIGNAL_THREAD;
event.sigev_signo = SIGUSR2;
event.sigev_code = 0;
event.sigev_value.sival_ptr = prp;
event.sigev_priority = -1;
MsgRegisterEvent( &event, SYSMGR_COID );
devctl( fd, DCMD_PROC_EVENT, &event, sizeof(event), NULL );
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