[英]Get total system memory without external tools
要获得安装的总RAM,我可以使用popen("sysctl -n hw.memsize", "r")
,但是是否有一些库可以在不运行外部工具的情况下获取此信息?
本节中使用的符号在文件sysctl.h中声明。 —功能:
int sysctl (int *names, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen)
#include <sys/resource.h>
int getrusage(int who, struct rusage *usage);
struct rusage {
struct timeval ru_utime; /* user time used */
struct timeval ru_stime; /* system time used */
long ru_maxrss; /* maximum resident set size */
long ru_ixrss; /* integral shared memory size */
long ru_idrss; /* integral unshared data size */
long ru_isrss; /* integral unshared stack size */
long ru_minflt; /* page reclaims */
long ru_majflt; /* page faults */
long ru_nswap; /* swaps */
long ru_inblock; /* block input operations */
long ru_oublock; /* block output operations */
long ru_msgsnd; /* messages sent */
long ru_msgrcv; /* messages received */
long ru_nsignals; /* signals received */
long ru_nvcsw; /* voluntary context switches */
long ru_nivcsw; /* involuntary context switches */
};
您可以使用api getrusage
int who = RUSAGE_SELF;
struct rusage usage={0,};
int ret=0;
ret = getrusage(who, &usage);
查找rusage的结构并选择您关心的值。
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