我想从基于linux的系统上运行的C应用程序中获得系统正常运行时间。我不想调用uptime（1）并解析输出，我想调用我怀疑存在的基础C API。任何人都知道是否有这样的电话，或者uptime（1）只是处理从wtmp获得的记录吗？
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; /* Seconds since boot */ unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ unsigned long totalram; /* Total usable main memory size */ unsigned long freeram; /* Available memory size */ unsigned long sharedram; /* Amount of shared memory */ unsigned long bufferram; /* Memory used by buffers */ unsigned long totalswap; /* Total swap space size */ unsigned long freeswap; /* swap space still available */ unsigned short procs; /* Number of current processes */ unsigned long totalhigh; /* Total high memory size */ unsigned long freehigh; /* Available high memory size */ unsigned int mem_unit; /* Memory unit size in bytes */ char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding for libc5 */ };
玩得开心！
