如何获取linux系统启动后运行了多少时间？

Question

shell下uptime可以获取。

但是linux下面有这样的api么，想要得到绝对时间

Answer 1

如果shell下用的是uptime,说明api中应该有这个函数

Answer 2

1. 309 struct sysinfo {
2.     310     long uptime;            /* Seconds since boot */
3.     311     unsigned long loads[3];     /* 1, 5, and 15 minute load averages */
4.     312     unsigned long totalram;     /* Total usable main memory size */
5.     313     unsigned long freeram;      /* Available memory size */
6.     314     unsigned long sharedram;    /* Amount of shared memory */
7.     315     unsigned long bufferram;    /* Memory used by buffers */
8.     316     unsigned long totalswap;    /* Total swap space size */
9.     317     unsigned long freeswap;     /* swap space still available */
10.     318     unsigned short procs;       /* Number of current processes */
11.     319     unsigned short pad;     /* explicit padding for m68k */
12.     320     unsigned long totalhigh;    /* Total high memory size */
13.     321     unsigned long freehigh;     /* Available high memory size */
14.     322     unsigned int mem_unit;      /* Memory unit size in bytes */
15.     323     char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
16.     324 };

复制代码可以用sysinfo获取