man一下sysconf，解釋這個(gè)函數(shù)用來(lái)獲取系統(tǒng)執(zhí)行的配置信息。例如頁(yè)大小、最大頁(yè)數(shù)、cpu個(gè)數(shù)、打開(kāi)句柄的最大個(gè)數(shù)等等。詳細(xì)說(shuō)明可以參考man，還可以寫(xiě)個(gè)實(shí)例進(jìn)行測(cè)試輸出，如下：

#include <stdio.h> #include <unistd.h>#define ONE_MB (1024 * 1024)int main() {printf("The number of processors configured is :%ld\n",sysconf(_SC_NPROCESSORS_CONF));printf("The number of processors currently online (available) is :%ld\n",sysconf(_SC_NPROCESSORS_ONLN));printf ("The pagesize: %ld\n", sysconf(_SC_PAGESIZE));printf ("The number of pages: %ld\n", sysconf(_SC_PHYS_PAGES));printf ("The number of available pages: %ld\n", sysconf(_SC_AVPHYS_PAGES));printf ("The memory size: %lld MB\n",(long long)sysconf(_SC_PAGESIZE) * (long long)sysconf(_SC_PHYS_PAGES) / ONE_MB );printf ("The number of files max opened:: %ld\n", sysconf(_SC_OPEN_MAX));printf("The number of ticks per second: %ld\n", sysconf(_SC_CLK_TCK));printf ("The max length of host name: %ld\n", sysconf(_SC_HOST_NAME_MAX));printf ("The max length of login name: %ld\n", sysconf(_SC_LOGIN_NAME_MAX));return 0; }

運(yùn)行后輸出如下結(jié)果：

The number of processors configured is :4
The number of processors currently online (available) is :4
The pagesize: 4096
The number of pages: 2016183
The number of available pages: 173676
The memory size: 7875 MB
The number of files max opened:: 1048576
The number of ticks per second: 100
The max length of host name: 64
The max length of login name: 256

　　

轉(zhuǎn)載于:https://www.cnblogs.com/mazhimazhi/p/11367877.html

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