|UNAME(3P)||POSIX Programmer's Manual||UNAME(3P)|
int uname(struct utsname *name);
The uname() function uses the utsname structure defined in <sys/utsname.h>.
The uname() function shall return a string naming the current system in the character array sysname. Similarly, nodename shall contain the name of this node within an implementation-defined communications network. The arrays release and version shall further identify the operating system. The array machine shall contain a name that identifies the hardware that the system is running on.
The format of each member is implementation-defined.
The following sections are informative.
This volume of POSIX.1‐2017 does not define the sizes of the members of the structure and permits them to be of different sizes, although most implementations define them all to be the same size: eight bytes plus one byte for the string terminator. That size for nodename is not enough for use with many networks.
The uname() function originated in System III, System V, and related implementations, and it does not exist in Version 7 or 4.3 BSD. The values it returns are set at system compile time in those historical implementations.
4.3 BSD has gethostname() and gethostid(), which return a symbolic name and a numeric value, respectively. There are related sethostname() and sethostid() functions that are used to set the values the other two functions return. The former functions are included in this specification, the latter are not.
Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
|2017||IEEE/The Open Group|