NAME

uname — get system identification

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <sys/utsname.h>

int
uname(struct utsname *name);

DESCRIPTION

The uname() function stores NUL-terminated strings of information identifying the current system into the structure referenced by name.

The utsname structure is defined in the <sys/utsname.h> header file, and contains the following members:

sysname: Name of the operating system implementation.
nodename: Network name of this machine.
release: Release level of the operating system.
version: Version level of the operating system.
machine: Machine hardware platform.

RETURN VALUES

The uname() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

ENVIRONMENT

UNAME_s: If the environment variable UNAME_s is set, it will override the sysname member.
UNAME_r: If the environment variable UNAME_r is set, it will override the release member.
UNAME_v: If the environment variable UNAME_v is set, it will override the version member.
UNAME_m: If the environment variable UNAME_m is set, it will override the machine member.

ERRORS

The uname() function may fail and set errno for any of the errors specified for the library functions sysctl(3).

STANDARDS

The uname() function conforms to IEEE Std 1003.1-1988 (“POSIX.1”).

HISTORY

The uname() function first appeared in 4.4BSD.