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| Kernel Functions for Drivers | ddi_log_sysevent(9F) |
| | ddi_log_sysevent - log system event for drivers |
SYNOPSIS
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#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_log_sysevent(dev_info_t *dip, char *vendor, char *class, char *subclass, nvlist_t *attr_list, sysevent_id_t *eidp, int sleep_flag); |
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Solaris DDI specific (Solaris DDI).
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dip
- A pointer to the dev_info node for this driver.
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vendor
- A pointer to a string defining the vendor. Third-party drivers should use their company's stock symbol (or similarly enduring identifier). Sun-supplied drivers should use DDI_VENDOR_SUNW.
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class
- A pointer to a string defining the event class.
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subclass
- A pointer to a string defining the event subclass.
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attr_list
- A pointer to an nvlist_t, listing the name-value attributes associated with the event or NULL if there are no such attributes for this event.
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eidp
- The address of a sysevent_id_t structure in which the event's sequence number and timestamp are returned if the event is successfully queued. May be NULL if this information is not of interest. See below for
the definition of sysevent_id_t.
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sleep_flag
- Indicates how a caller wants to handle the possibility of resources not being available. If sleep_flag is DDI_NOSLEEP, the caller does not care if the allocation fails or the queue is
full and can handle a failure appropriately. If sleep_flag is DDI_SLEEP, the caller wishes to have the allocation and queuing routines wait for resources to become available.
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ddi_log_sysevent() causes a system event, of the specified class and subclass, to be generated on behalf of the driver and queued for delivery to syseventd, the user-land sysevent daemon.
The publisher string for the event is constructed using the vendor name and driver name, with the format:
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"<vendor>:kern:<driver-name>"
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The two fields of eidp, eid_seq and eid_ts, are sufficient to uniquely identify an event.
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The structure members of sysevent_id_t are:
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uint64_t eid_seq; /* sysevent sequence number */
hrtime_t eid_ts; /* sysevent timestamp */
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ddi_log_sysevent() returns:
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DDI_SUCCESS
- The event has been queued for delivery successfully.
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DDI_ENOMEM
- There is not enough memory to queue the system event at this time. DDI_ENOMEM cannot be returned when sleep_flag is DDI_SLEEP.
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DDI_EBUSY
- The system event queue is full at this time. DDI_EBUSY cannot be returned when sleep_flag is DDI_SLEEP.
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DDI_ETRANSPORT
- The syseventd daemon is not responding and events cannot be queued or delivered at this time. DDI_ETRANSPORT can be returned even when sleep_flag is DDI_SLEEP.
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DDI_ECONTEXT
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sleep_flag is DDI_SLEEP and the driver is running in interrupt context.
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ddi_log_sysevent() can be called from user or interrupt context, except when sleep_flag is DDI_SLEEP, in which case it can be called from user context only.
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| | Example 1. Logging System Event with No Attributes
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if (ddi_log_sysevent(dip, DDI_VENDOR_SUNW, "class", "subclass",
NULL, NULL, DDI_SLEEP) != DDI_SUCCESS) {
cmn_err(CE_WARN, "error logging system event\n");
}
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Example 2. Logging System Event with Two Name/Value Attributes, an Integer and a String
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nvlist_t *attr_list;
sysevent_id_t eid;
if (nvlist_alloc(&attr_list, NV_UNIQUE_NAME_TYPE, NV_FLAG_KMSLEEP) == 0)
{
err = nvlist_add_uint32(attr_list, int_name, int_value);
if (err == 0)
err = nvlist_add_string(attr_list, str_name, str_value);
if (err == 0)
err = ddi_log_sysevent(dip, DDI_VENDOR_SUNW,
"class", "subclass", attr_list, &eid, DDI_SLEEP);
if (err != DDI_SUCCESS)
cmn_err(CE_WARN, "error logging system event\n");
nvlist_free(attr_list);
}
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Example 3. Use Timeout to Handle nvlist and System Event Resource Allocation Failures
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Since no blocking calls are made, this example would be useable from a driver needing to generate an event from interrupt context.
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static int
xx_se_timeout_handler(xx_state_t *xx)
{
xx->xx_timeoutid = (xx_generate_event(xx) ?
timeout(xx_se_timeout_handler, xx, 4) : 0);
}
static int
xx_generate_event(xx_state_t *xx)
{
int err;
err = nvlist_alloc(&xx->xx_ev_attrlist, NV_UNIQUE_NAME_TYPE, 0);
if (err != 0)
return (1);
err = nvlist_add_uint32(&xx->xx_ev_attrlist,
xx->xx_ev_name, xx->xx_ev_value);
if (err != 0) {
nvlist_free(xx->xx_ev_attrlist);
return(1);
}
err = ddi_log_sysevent(xx->xx_dip, DDI_VENDOR_SUNW,
xx->xx_ev_class, xx->xx_ev_sbclass,
xx->xx_ev_attrlist, NULL, DDI_NOSLEEP);
nvlist_free(xx->xx_ev_attrlist);
if (err == DDI_SUCCESS || err == DDI_ETRANSPORT) {
if (err == DDI_ETRANSPORT)
cmn_err(CE_WARN, "cannot log system event\n");
return (0);
}
return (1);
}
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