Resource limits of Process

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每个进程都有自己的资源的限制，可以用getrlimit and setrlimit修改

下面这个代码显示了当前进程的资源情况。

/*
* =====================================================================================
*
*       Filename: process_limit.c
*
*    Description:
*
*        Version: 1.0
*        Created: 08/13/2010 01:36:24 PM
*       Revision: none
*       Compiler: gcc
*
*         Author: YOUR NAME (),
*        Company:
*
* =====================================================================================
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#if defined(BSD) || defined(MACOS)
#include <sys/time.h>
#define FMT "%10lld "
#else
#define FMT "%10ld "
#endif
#include <sys/resource.h>

#define doit(name) pr_limits(#name, name)

static void pr_limits(char *, int);

int
main(void)
{

#ifdef RLIMIT_AS
    doit(RLIMIT_AS);
#endif
    doit(RLIMIT_CORE);
    doit(RLIMIT_CPU);
    doit(RLIMIT_DATA);
    doit(RLIMIT_FSIZE);
#ifdef RLIMIT_LOCKS
    doit(RLIMIT_LOCKS);
#endif
#ifdef RLIMIT_MEMLOCK
    doit(RLIMIT_MEMLOCK);
#endif
    doit(RLIMIT_NOFILE);
#ifdef RLIMIT_NPROC
    doit(RLIMIT_NPROC);
#endif
#ifdef RLIMIT_RSS
    doit(RLIMIT_RSS);
#endif
#ifdef RLIMIT_SBSIZE
    doit(RLIMIT_SBSIZE);
#endif
    doit(RLIMIT_STACK);
#ifdef RLIMIT_VMEM
    doit(RLIMIT_VMEM);
#endif
    exit(0);
}

static void
pr_limits(char *name, int resource)
{
    struct rlimit limit;

    if (getrlimit(resource, &limit) < 0)
        printf("getrlimit error for %s", name);
    printf("%-14s ", name);
    if (limit.rlim_cur == RLIM_INFINITY)
        printf("(infinite) ");
    else
        printf(FMT, limit.rlim_cur);
    if (limit.rlim_max == RLIM_INFINITY)
        printf("(infinite)");
    else
        printf(FMT, limit.rlim_max);
    putchar((int)'/n');
}