Linux exercises (obtain host information)

#include <sys/utsname.h>#include <unistd.h>#include <stdio.h>int main(){        char computer[256];        struct utsname uts;        if(gethostname(computer,256)!=0 || uname(&uts)<0)        {                exit(1);        }        printf("Computer host name is %s\n",computer);        printf("System is %s on %s hardware\n",uts.sysname,uts.machine);        printf("Nodename is %s\n",uts.nodename);        printf("Version is %s, %s\n",uts.release,uts.version);        return 0;}

Function prototype:

# Include <unistd. h>

Int gethostname (char * Name, size_t namelen );

Write the Network Name of the machine to name. The string must be at least as long as namelen. 0 is returned. Otherwise,-1 is returned.

 

# Include <sys/utsname. h>

Int uname (struct utsname * Name );

Write host data to a struct directed by name.

Utsname struct data element:

Char sysname []; operating system name

Char nodename []; host name

Char release []; Release level of the system

Char version []; System Version Number

Char Machine []; hardware type

A non-negative integer is returned for success.-1 is returned for failure.

 

Note:

License issues:

# Include <unistd. h>

Long gethostid (void); returns a unique value for the host to ensure the software license.