int getrlimit (int resource, struct rlimit *rlim);
int getrusage (int who, struct rusage *usage);
int setrlimit (int resource, const struct rlimit *rlim);
RLIMIT_CPU /* CPU time in ms */
RLIMIT_FSIZE /* Maximum filesize */
RLIMIT_DATA /* max data size */
RLIMIT_STACK /* max stack size */
RLIMIT_CORE /* max core file size */
RLIMIT_RSS /* max resident set size */
The following are not yet implemented [Documenter's note: as of when?]:
RLIMIT_MEMLOCK /* max locked-in-memory address space*/
RLIMIT_NPROC /* max number of processes */
RLIMIT_OFILE /* max number of open files */
A resource may unlimited if you set the limit to RLIM_INFINITY.
The rlimit structure is defined as follows :
struct rlimit
{
int rlim_cur;
int rlim_max;
};
getrusage returns the current resource usages, for a who of either RUSAGE_SELF or RUSAGE_CHILDREN.
struct rusage
{
struct timeval ru_utime; /* user time used */
struct timeval ru_stime; /* system time used */
long ru_maxrss; /* maximum resident set size */
long ru_ixrss; /* integral shared memory size */
long ru_idrss; /* integral unshared data size */
long ru_isrss; /* integral unshared stack size */
long ru_minflt; /* page reclaims */
long ru_majflt; /* page faults */
long ru_nswap; /* swaps */
long ru_inblock; /* block input operations */
long ru_oublock; /* block output operations */
long ru_msgsnd; /* messages sent */
long ru_msgrcv; /* messages received */
long ru_nsignals; /* signals received */
long ru_nvcsw; /* voluntary context switches */
long ru_nivcsw; /* involuntary context switches */
};