Getrlimit and sysconf functions under Linux

#include <stdio.h> #include <sys/time.h> #include <sys/resource.h>int main (int argc, char *argv[]) {  struct Rlimit nofile_rlmt;  if (Getrlimit (Rlimit_nofile, &NOFILE_RLMT)! =-1) {    printf ("Gets the maximum number of file descriptors the process can open: \ n"        "Rlim_cur (Soft limit ):%d "        " \nrlim_max (hard limit (ceiling for rlim_cur):%d\n ",        nofile_rlmt.rlim_cur, Nofile_rlmt.rlim_max);}  }

Getrlimit and Setlimit functions can be explained by:

Http://www.cnblogs.com/niocai/archive/2012/04/01/2428128.html

#include <stdio.h> #include <stdlib.h> #include <unistd.h>//sysconf#define one_mb (1024x768 * 1024x768) int Main (int argc, char **argv[]) {  Long num_cpu = sysconf (_SC_NPROCESSORS_ONLN);  printf ("Number of Cups:%ld\n", num_cpu);    Long page_size = sysconf (_sc_pagesize);  printf ("Size of system page:%ld k\n", page_size);  Long num_pages = sysconf (_sc_phys_pages);  printf ("Number of physical pages in system:%LD \ n", num_pages);  Long free_pages = sysconf (_sc_avphys_pages);  printf ("Number of pages available in the system:%LD \ n", free_pages);  Long Long mem = (long Long) (Long Long) num_pages * (Long Long) page_size);  Mem/= one_mb;  Long Long Free_mem = (long Long) (Long Long) free_pages * (Long Long) page_size);  Free_mem/= one_mb;  printf ("A total of%lld MB of physical memory, free physical memory has%lld mb\n", Mem, free_mem);    Long Open_max = sysconf (_sc_open_max);  printf ("Maximum number of files per process:%ld\n", Open_max);      return 0;}

Sysconf, pathconf, fpathconf function Detailed reference:

Http://xingyunbaijunwei.blog.163.com/blog/static/7653806720119122344450/

Getrlimit and sysconf functions under Linux