clock_getcpuclockid - access a process CPU-time clock
#include <time.h> int clock_getcpuclockid(pid_t pid, clockid_t *clock_id);
The clock_getcpuclockid() function shall return the clock ID of the CPU-time clock of the process specified by pid. If the process described by pid exists and the calling process has permission, the clock ID of this clock shall be returned in clock_id. If pid is zero, the clock_getcpuclockid() function shall return the clock ID of the CPU-time clock of the process making the call in clock_id. The conditions under which one process has permission to obtain the CPU-time clock ID of other processes are implementation-defined.
On successful completion, clock_getcpuclockid() shall return 0; otherwise an error shall be returned to indicate the error
The clock_getcpuclockid() function will fail if:
The requesting process does not have permission to access the CPU-time clock for the process.
The clock_getcpuclockid() function may fail if:
No process can be found corresponding to the process specified by pid.
See attributes(7) for descriptions of the following attributes: