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-.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>.
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 2007-07-05 mtk: Added details on underlying system call interfaces
-.\"
-.TH uname 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-uname \- get name and information about current kernel
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/utsname.h>
-.P
-.BI "int uname(struct utsname *" buf );
-.fi
-.SH DESCRIPTION
-.BR uname ()
-returns system information in the structure pointed to by
-.IR buf .
-The
-.I utsname
-struct is defined in
-.IR <sys/utsname.h> :
-.P
-.in +4n
-.EX
-struct utsname {
-    char sysname[];    /* Operating system name (e.g., "Linux") */
-    char nodename[];   /* Name within communications network
-                          to which the node is attached, if any */
-    char release[];    /* Operating system release
-                          (e.g., "2.6.28") */
-    char version[];    /* Operating system version */
-    char machine[];    /* Hardware type identifier */
-#ifdef _GNU_SOURCE
-    char domainname[]; /* NIS or YP domain name */
-#endif
-};
-.EE
-.in
-.P
-The length of the arrays in a
-.I struct utsname
-is unspecified (see NOTES);
-the fields are terminated by a null byte (\[aq]\e0\[aq]).
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-.I buf
-is not valid.
-.SH VERSIONS
-The
-.I domainname
-member (the NIS or YP domain name) is a GNU extension.
-.P
-The length of the fields in the struct varies.
-Some operating systems
-or libraries use a hardcoded 9 or 33 or 65 or 257.
-Other systems use
-.B SYS_NMLN
-or
-.B _SYS_NMLN
-or
-.B UTSLEN
-or
-.BR _UTSNAME_LENGTH .
-Clearly, it is a bad
-idea to use any of these constants; just use sizeof(...).
-SVr4 uses 257, "to support Internet hostnames"
-\[em] this is the largest value likely to be encountered in the wild.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, SVr4, 4.4BSD.
-.SS C library/kernel differences
-Over time, increases in the size of the
-.I utsname
-structure have led to three successive versions of
-.BR uname ():
-.IR sys_olduname ()
-(slot
-.IR __NR_oldolduname ),
-.IR sys_uname ()
-(slot
-.IR __NR_olduname ),
-and
-.IR sys_newuname ()
-(slot
-.IR __NR_uname) .
-The first one
-.\" That was back before Linux 1.0
-used length 9 for all fields;
-the second
-.\" That was also back before Linux 1.0
-used 65;
-the third also uses 65 but adds the
-.I domainname
-field.
-The glibc
-.BR uname ()
-wrapper function hides these details from applications,
-invoking the most recent version of the system call provided by the kernel.
-.SH NOTES
-The kernel has the name, release, version, and supported machine type built in.
-Conversely, the
-.I nodename
-field is configured by the administrator to match the network
-(this is what the BSD historically calls the "hostname",
-and is set via
-.BR sethostname (2)).
-Similarly, the
-.I domainname
-field is set via
-.BR setdomainname (2).
-.P
-Part of the utsname information is also accessible via
-.IR /proc/sys/kernel/ { ostype ,
-.IR hostname ,
-.IR osrelease ,
-.IR version ,
-.IR domainname }.
-.SH SEE ALSO
-.BR uname (1),
-.BR getdomainname (2),
-.BR gethostname (2),
-.BR uts_namespaces (7)