6.9. System Identification
POSIX.1 defines the uname function to return information on the current host and operating system. #include <sys/utsname.h>
int uname(struct utsname *name );
| | Returns: non-negative value if OK, 1 on error | We pass the address of a utsname structure, and the function fills it in. POSIX.1 defines only the minimum fields in the structure, which are all character arrays, and it's up to each implementation to set the size of each array. Some implementations provide additional fields in the structure.struct utsname {
char sysname[]; /* name of the operating system */
char nodename[]; /* name of this node */
char release[]; /* current release of operating system */
char version[]; /* current version of this release */
char machine[]; /* name of hardware type */
};
Section 2.6.Finally, this function gives us a way only to fetch the information in the structure; there is nothing specified by POSIX.1 about initializing this information.Historically, BSD-derived systems provide the gethostname function to return only the name of the host. This name is usually the name of the host on a TCP/IP network. #include <unistd.h>
int gethostname(char *name , int namelen );
| | Returns: 0 if OK, 1 on error | The namelen argument specifies the size of the name buffer. If enough space is provided, the string returned through name is null terminated. If insufficient room is provided, however, it is unspecified whether the string is null terminated.The gethostname function, now defined as part of POSIX.1, specifies that the maximum host name length is HOST_NAME_MAX. The maximum name lengths supported by the four implementations covered in this book are summarized in  |
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