.\" -*- coding: UTF-8 -*-
.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
.\"
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.\" Modified 1995-07-22 by Michael Chastain <mec@duracef.shout.net>:
.\"   'gethostname' is real system call on Linux/Alpha.
.\" Modified 1997-01-31 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 2000-06-04, 2001-12-15 by aeb
.\" Modified 2004-06-17 by mtk
.\" Modified 2008-11-27 by mtk
.\"
.\"*******************************************************************
.\"
.\" This file was generated with po4a. Translate the source file.
.\"
.\"*******************************************************************
.TH GETHOSTNAME 2 "10 października 2019 r." Linux "Podręcznik programisty Linuksa"
.SH NAZWA
gethostname, sethostname \- pobranie/ustawienie nazwy hosta
.SH SKŁADNIA
\fB#include <unistd.h>\fP
.PP
\fBint gethostname(char *\fP\fIname\fP\fB, size_t \fP\fIlen\fP\fB);\fP
.br
\fBint sethostname(const char *\fP\fIname\fP\fB, size_t \fP\fIlen\fP\fB);\fP
.PP
.in -4n
Wymagane ustawienia makr biblioteki glibc (patrz \fBfeature_test_macros\fP(7)):
.in
.PP
.ad l
.PD 0
\fBgethostname\fP():
.RS 4
Od glibc 2.12: _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
.br
|| /* Od glibc 2.12: */ _POSIX_C_SOURCE\ >=\ 200112L
.RE
.br
\fBsethostname\fP():
.nf
.\"		commit 266865c0e7b79d4196e2cc393693463f03c90bd8
    Od glibc 2.21:
        _DEFAULT_SOURCE
    W glibc 2.19 i 2.20:
        _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE\ <\ 500)
    Do glibc 2.19 włącznie:
        _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE\ <\ 500)
.fi
.PD
.ad
.SH OPIS
These system calls are used to access or to change the system hostname.
More precisely, they operate on the hostname associated with the calling
process's UTS namespace.
.PP
\fBsethostname\fP()  sets the hostname to the value given in the character
array \fIname\fP.  The \fIlen\fP argument specifies the number of bytes in
\fIname\fP.  (Thus, \fIname\fP does not require a terminating null byte.)
.PP
\fBgethostname\fP()  returns the null\-terminated hostname in the character
array \fIname\fP, which has a length of \fIlen\fP bytes.  If the null\-terminated
hostname is too large to fit, then the name is truncated, and no error is
returned (but see NOTES below).  POSIX.1 says that if such truncation
occurs, then it is unspecified whether the returned buffer includes a
terminating null byte.
.SH "WARTOŚĆ ZWRACANA"
Po pomyślnym zakończeniu zwracane jest zero. Po błędzie zwracane jest \-1 i
odpowiednio ustawiane jest \fIerrno\fP.
.SH BŁĘDY
.TP 
\fBEFAULT\fP
\fIname\fP jest nieprawidłowym adresem.
.TP 
\fBEINVAL\fP
.\" Can't occur for gethostbyname() wrapper, since 'len' has an
.\" unsigned type; can occur for the underlying system call.
\fIlen\fP jest ujemne lub, przy \fBsethostname\fP(), \fIlen\fP jest większe niż
maksymalny dopuszczalny rozmiar.
.TP 
\fBENAMETOOLONG\fP
(glibc \fBgethostname\fP())  \fIlen\fP jest mniejsze niż rzeczywisty
rozmiar. Przed wersją 2.1, glibc w tym przypadku używało \fBEINVAL\fP.
.TP 
\fBEPERM\fP
For \fBsethostname\fP(), the caller did not have the \fBCAP_SYS_ADMIN\fP
capability in the user namespace associated with its UTS namespace (see
\fBnamespaces\fP(7)).
.SH "ZGODNE Z"
SVr4, 4.4BSD (these interfaces first appeared in 4.2BSD).  POSIX.1\-2001 and
POSIX.1\-2008 specify \fBgethostname\fP()  but not \fBsethostname\fP().
.SH UWAGI
SUSv2 guarantees that "Host names are limited to 255 bytes".  POSIX.1
guarantees that "Host names (not including the terminating null byte) are
limited to \fBHOST_NAME_MAX\fP bytes".  On Linux, \fBHOST_NAME_MAX\fP is defined
with the value 64, which has been the limit since Linux 1.0 (earlier kernels
imposed a limit of 8 bytes).
.SS "Różnice biblioteki C/jądra"
The GNU C library does not employ the \fBgethostname\fP()  system call;
instead, it implements \fBgethostname\fP()  as a library function that calls
\fBuname\fP(2)  and copies up to \fIlen\fP bytes from the returned \fInodename\fP
field into \fIname\fP.  Having performed the copy, the function then checks if
the length of the \fInodename\fP was greater than or equal to \fIlen\fP, and if it
is, then the function returns \-1 with \fIerrno\fP set to \fBENAMETOOLONG\fP; in
this case, a terminating null byte is not included in the returned \fIname\fP.
.PP
.\" At least glibc 2.0 and 2.1, older versions not checked
Versions of glibc before 2.2 handle the case where the length of the
\fInodename\fP was greater than or equal to \fIlen\fP differently: nothing is
copied into \fIname\fP and the function returns \-1 with \fIerrno\fP set to
\fBENAMETOOLONG\fP.
.SH "ZOBACZ TAKŻE"
\fBhostname\fP(1), \fBgetdomainname\fP(2), \fBsetdomainname\fP(2), \fBuname\fP(2),
\fButs_namespaces\fP(7)
.SH "O STRONIE"
Angielska wersja tej strony pochodzi z wydania 5.04 projektu Linux
\fIman\-pages\fP. Opis projektu, informacje dotyczące zgłaszania błędów oraz
najnowszą wersję oryginału można znaleźć pod adresem
\%https://www.kernel.org/doc/man\-pages/.

.SH TŁUMACZENIE
Autorami polskiego tłumaczenia niniejszej strony podręcznika są:
Przemek Borys <pborys@dione.ids.pl>,
Andrzej Krzysztofowicz <ankry@green.mf.pg.gda.pl>
i
Michał Kułach <michal.kulach@gmail.com>
.

Niniejsze tłumaczenie jest wolną dokumentacją. Bliższe informacje o warunkach
licencji można uzyskać zapoznając się z
.UR https://www.gnu.org/licenses/gpl-3.0.html
GNU General Public License w wersji 3
.UE
lub nowszej. Nie przyjmuje się ŻADNEJ ODPOWIEDZIALNOŚCI.

Błędy w tłumaczeniu strony podręcznika prosimy zgłaszać na adres
.MT
manpages-pl-list@lists.sourceforge.net
.ME .
