man pages section 3: Extended Library Functions, Volume 1

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Updated: July 2014
 
 

ct_pr_event_get_pid(3CONTRACT)

Name

ct_pr_event_get_pid, ct_pr_event_get_ppid, ct_pr_event_get_signal, ct_pr_event_get_sender, ct_pr_event_get_senderct, ct_pr_event_get_exitstatus, ct_pr_event_get_pcorefile, ct_pr_event_get_gcorefile, ct_pr_event_get_zcorefile - process contract event functions

Synopsis

cc [ flag… ] file–D_LARGEFILE64_SOURCE –lcontract [ library… ]
#include <libcontract.h>
#include <sys/contract/process.h>

int ct_pr_event_get_pid(ct_evthdl_t evthdl, pid_t *pidp);
int ct_pr_event_get_ppid(ct_evthdl_t evthdl, pid_t *pidp);
int ct_pr_event_get_signal(ct_evthdl_t evthdl, int *signalp);
int ct_pr_event_get_sender(ct_evthdl_t evthdl, pid_t *pidp);
int ct_pr_event_get_senderct(ct_evthdl_t evthdl, ctid_t *pidp);
int ct_pr_event_get_exitstatus(ct_evthdl_t evthdl, int *statusp);
int ct_pr_event_get_pcorefile(ct_evthdl_t evthdl, char **namep);
int ct_pr_event_get_gcorefile(ct_evthdl_t evthdl, char **namep);
int ct_pr_event_get_zcorefile(ct_evthdl_t evthdl, char **namep);

Description

These functions read process contract event information from an event object returned by ct_event_read(3CONTRACT) or ct_event_read_critical(3CONTRACT).

The ct_pr_event_get_pid() function reads the process ID of the process generating the event.

The ct_pr_event_get_ppid() function reads the process ID of the process that forked the new process causing the CT_PR_EV_FORK event.

The ct_pr_event_get_signal() function reads the signal number of the signal that caused the CT_PR_EV_SIGNAL event.

The ct_pr_event_get_sender() function reads the process ID of the process that sent the signal that caused the CT_PR_EV_SIGNAL event. If the signal's sender was not in the same zone as the signal's recipient, this information is available only to event consumers in the global zone.

The ct_pr_event_get_senderct function reads the contract ID of the process that sent the signal that caused the CT_PR_EV_SIGNAL event. If the signal's sender was not in the same zone as the signal's recipient, this information is available only

The ct_pr_event_get_exitstatus() function reads the exit status of the process generating a CT_PR_EV_EXIT event.

The ct_pr_event_get_pcorefile() function reads the name of the process core file if one was created when the CT_PR_EV_CORE event was generated. A pointer to a character array is stored in *namep and is freed when ct_event_free(3CONTRACT) is called on the event handle.

The ct_pr_event_get_gcorefile() function reads the name of the zone's global core file if one was created when the CT_PR_EV_CORE event was generated. A pointer to a character array is stored in *namep and is freed when ct_event_free () is called on the event handle.

The ct_pr_event_get_zcorefile() function reads the name of the system-wide core file in the global zone if one was created when the CT_PR_EV_CORE event was generated. This information is available only to event consumers in the global zone. A pointer to a character array is stored in *namep and is freed when ct_event_free() is called on the event handle.

Return Values

Upon successful completion, ct_pr_event_get_pid(), ct_pr_event_get_ppid(), ct_pr_event_get_signal(), ct_pr_event_get_sender(), ct_pr_event_get_senderct(), ct_pr_event_get_exitstatus(), ct_pr_event_get_pcorefile(), ct_pr_event_get_gcorefile(), and ct_pr_event_get_zcorefile() return 0. Otherwise, they return a non-zero error value.

Errors

The ct_pr_event_get_pid(), ct_pr_event_get_ppid(), ct_pr_event_get_signal(), ct_pr_event_get_sender(), ct_pr_event_get_senderct(), ct_pr_event_get_exitstatus(), ct_pr_event_get_pcorefile (), ct_pr_event_get_gcorefile(), and ct_pr_event_get_zcorefile() functions will fail if:

EINVAL

The evthdl argument is not a process contract event object.

The ct_pr_event_get_ppid(), ct_pr_event_get_signal(), ct_pr_event_get_sender(), ct_pr_event_get_senderct(), ct_pr_event_get_exitstatus(), ct_pr_event_get_pcorefile(), ct_pr_event_get_gcorefile(), and ct_pr_event_get_zcorefile() functions will fail if:

EINVAL

The requested data do not match the event type.

The ct_pr_event_get_sender()a functions will fail if:

ENOENT

The process ID of the sender was not available, or the event object was read by a process running in a non-global zone and the sender was in a different zone.

The ct_pr_event_get_pcorefile(), ct_pr_event_get_gcorefile(), and ct_pr_event_get_zcorefile() functions will fail if:

ENOENT

The requested core file was not created.

The ct_pr_event_get_zcorefile() function will fail if:

ENOENT

The event object was read by a process running in a non-global zone.

Examples

Example 1 Print the instigator of all CT_PR_EV_SIGNAL events.

Open the process contract bundle. Loop reading events. Fetch and display the signalled pid and signalling pid for each CT_PR_EV_SIGNAL event encountered.

#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <libcontract.h>
 
...
int fd;
ct_evthdl_t event;
pid_t pid, sender;

fd = open("/system/contract/process/bundle", O_RDONLY);
for (;;) {
        ct_event_read(fd, &event);
        if (ct_event_get_type(event) != CT_PR_EV_SIGNAL) {
                ct_event_free(event);
                continue;
        }
        ct_pr_event_get_pid(event, &pid);
        if (ct_pr_event_get_sender(event, &sender) == ENOENT)
                printf("process %ld killed by unknown process\n",
                    (long)pid);
        else
                printf("process %ld killed by process %ld\n",
                    (long)pid, (long)sender);
        ct_event_free(event);
}
        ...

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
MT-Level
Safe

See Also

ct_event_free(3CONTRACT), ct_event_read(3CONTRACT), ct_event_read_critical(3CONTRACT), libcontract(3LIB) , contract(4), process(4) , attributes(5), lfcompile( 5)