您要查找的系统调用是sysinfo（）。
它在sys / sysinfo.h中定义
它的签名是：int sysinfo（struct sysinfo * info）
从内核2.4开始，结构如下所示：
struct sysinfo { long uptime; unsigned long loads[3]; unsigned long totalram; unsigned long freeram; unsigned long sharedram; unsigned long bufferram; unsigned long totalswap; unsigned long freeswap; unsigned short procs; unsigned long totalhigh; unsigned long freehigh; unsigned int mem_unit; char _f[20-2*sizeof(long)-sizeof(int)]; };玩得开心！
