Linux系统调用-uname函数详解.doc

Function : uname() Header in #include sys/utsname.h theory of functions：extern int uname (struct utsname *__name) __THROW; return 0 if success, return -1 if failed, when errno is setted EFAULT, it means buffer is invalid。you can use “man uname” to know it in detail。 Argument __name ：store system information. struct utsname? { char sysname[_UTSNAME_SYSNAME_LENGTH];// current operating system name?? char nodename[_UTSNAME_NODENAME_LENGTH];//the name of the network?? char release[_UTSNAME_RELEASE_LENGTH];//the curren release level?? char version[_UTSNAME_VERSION_LENGTH];//the current release?? char machine[_UTSNAME_MACHINE_LENGTH];//types of current hardware systems#if _UTSNAME_DOMAIN_LENGTH - 0??? /* Name of the domain of this node on the network.? */# ifdef __USE_GNU??? char domainname[_UTSNAME_DOMAIN_LENGTH]; //current domain’s name# else??? char __domainname[_UTSNAME_DOMAIN_LENGTH];# endif#endif? }; for example：#include sys/utsname.h#include stdio.h#include stdlib.hint main(){??? struct utsname testbuff;??? int fb=0;??? fb=uname(testbuff);??? if(fb0)??? {??????? perror(uname);??????? return 0;??? }else??? {??????? printf( sysname:%s\n nodename:%s\n release:%s\n version:%s\n machine:%s\n \n ,\??????????????????? testbuff.sysname,\??????????????????? testbuff.nodename,\??????????????????? testbuff.release,\??????????????????? testbuff.version,\??????????????????? testbuff.machine);#if _UTSNAME_DOMAIN_LENGTH - 0# ifdef __USE_GNU??? printf( domainame:%s\n ,testbuff.domainname);??? //char domainname[_UTSNAME_DOMAIN_LENGTH]; //current domain’s name# else??? printf( __domainame:%s\n ,testbuff.__domainname);??? //char __domainname[_UTSNAME_DOMAIN_LENGTH];# endif#endif??? }return 0;} for my machine : the program is to test byte order #include unp.h #include sys/utsname.h int main(int argc, char **argv) { struct utsname testbuff; int fb=0; union { short s; char c[sizeof(short)]; } un; fb=uname(te