I. Resource limitations of processes and signals

Process resource Functions

#include <sys/resource.h>Get user ResourcesintGetrlimit (intResourcestructRlimit *rlptr); Set User ResourcesintSetrlimit (intResourcestructRlimit *rlptr); kernel resource structurestructrlimit{rlimit_t rlim_cur;/*Soft limit:current limit**/software Resources rlimit_t Rlim_max;/*Hard limit;maximum value for rlim_cur**/Hardware Resources}

Resource value rlimit_as       process available Store size Rlimit_core   CORE file Maximum bytes rlimit_cpu     CPU time Max Rlimit_data   Maximum length of data segment rlimit_fsize the maximum  number of rlimit_locks file locks rlimit_memlock use Mlock to lock the longest number of bytes in memory rlimit_nofile   The maximum number of files that can be opened rlimit_nproc the maximum number of processes per user ID Rlimit_rss The maximum length of Rlimit_stack stack for the maximum     stored set byte length

Get System Resource parameters

#include <sys/resource.h>#include<stdlib.h>#include<stdio.h>#include<string.h>#defineRlimit (name) get_limit (#name, name)voidGet_limit (Char*name,intResource) {    structRlimit limit; if(Getrlimit (Resource,&limit) <0) {printf ("Get limit Resource error"); return ; } printf ("%-15s", name); if(limit.rlim_cur==rlim_infinity) {printf ("Infinity"); }    Else{printf ("%10ld", Limit.rlim_cur); }    if(limit.rlim_max==rlim_infinity) {printf ("infinity\n"); }    Else{printf ("%10ld\n", Limit.rlim_max); }    return;}intMain () {rlimit (rlimit_as);    Rlimit (Rlimit_core);    Rlimit (RLIMIT_CPU);    Rlimit (Rlimit_data);    Rlimit (rlimit_fsize);    Rlimit (rlimit_locks);    Rlimit (Rlimit_memlock);    Rlimit (Rlimit_nofile);    Rlimit (RLIMIT_NPROC);    Rlimit (RLIMIT_RSS);    Rlimit (Rlimit_stack); return 0;}

Results

rlimit_as       Infinity infinityrlimit_core             0  infinityrlimit_cpu      Infinity Infinityrlimit_data     Infinity infinityrlimit_fsize    Infinity infinityrlimit_locks    Infinity Infinityrlimit_memlock      65536     65536rlimit_nofile        1024      65536rlimit_nproc         3749      3749Rlimit_rss      Infinity Infinityrlimit_stack       8388608 Infinity

Linux System Resource Throttling configuration

/etc/security/limits.conf File open limit system already exists, 0, File Open,1, file output,2, file error

I. Resource limitations of processes and signals