{"id":6680,"date":"2022-12-20T19:33:23","date_gmt":"2022-12-20T22:33:23","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/getnetent-man3\/"},"modified":"2022-12-20T19:33:23","modified_gmt":"2022-12-20T22:33:23","slug":"getnetent-man3","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/getnetent-man3\/","title":{"rendered":"GETNETENT (man3)"},"content":{"rendered":"

GETNETENT<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
RETURN VALUE<\/a>
FILES<\/a>
ATTRIBUTES<\/a>
CONFORMING TO<\/a>
NOTES<\/a>
SEE ALSO<\/a>
COLOPHON<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent \u2212 get network entry<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

#include <\/b><\/p>\n

struct netent *getnetent(void);<\/b><\/p>\n

struct netent *getnetbyname(const char *<\/b>name<\/i>);<\/b><\/p>\n

struct netent *getnetbyaddr(uint32_t<\/b> net<\/i>, int<\/b> type<\/i>);<\/b><\/p>\n

void setnetent(int<\/b> stayopen<\/i>);<\/b><\/p>\n

void endnetent(void);<\/b><\/p>\n

DESCRIPTION <\/a> <\/h2>\n

The getnetent<\/b>() function reads the next entry from the networks database and returns a netent<\/i> structure containing the broken-out fields from the entry. A connection is opened to the database if necessary.<\/p>\n

The getnetbyname<\/b>() function returns a netent<\/i> structure for the entry from the database that matches the network name<\/i>.<\/p>\n

The getnetbyaddr<\/b>() function returns a netent<\/i> structure for the entry from the database that matches the network number net<\/i> of type type<\/i>. The net<\/i> argument must be in host byte order.<\/p>\n

The setnetent<\/b>() function opens a connection to the database, and sets the next entry to the first entry. If stayopen<\/i> is nonzero, then the connection to the database will not be closed between calls to one of the getnet*<\/b>() functions.<\/p>\n

The endnetent<\/b>() function closes the connection to the database.<\/p>\n

The netent<\/i> structure is defined in <\/i> as follows:<\/p>\n

struct netent {
char *n_name; \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var official network name bodies\/ usr\/
char **n_aliases; \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var alias list bodies\/ usr\/
int n_addrtype; \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var net address type bodies\/ usr\/
uint32_t n_net; \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var network number bodies\/ usr\/
}<\/p>\n

The members of the netent<\/i> structure are:<\/p>\n\n\n
<\/td>\n\n

n_name<\/i><\/p>\n<\/td>\n

<\/td>\n\n

The official name of the network.<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

n_aliases<\/i><\/p>\n

A NULL-terminated list of alternative names for the network.<\/p>\n

n_addrtype<\/i><\/p>\n

The type of the network number; always AF_INET<\/b>.<\/p>\n\n\n
<\/td>\n\n

n_net<\/i><\/p>\n<\/td>\n

<\/td>\n\n

The network number in host byte order.<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

RETURN VALUE <\/a> <\/h2>\n

The getnetent<\/b>(), getnetbyname<\/b>(), and getnetbyaddr<\/b>() functions return a pointer to a statically allocated netent<\/i> structure, or a null pointer if an error occurs or the end of the file is reached.<\/p>\n

FILES <\/a> <\/h2>\n

\/etc\/networks<\/i><\/p>\n

networks database file<\/p>\n

ATTRIBUTES <\/a> <\/h2>\n

For an explanation of the terms used in this section, see attributes<\/b>(7).<\/p>\n

\"Image<\/p>\n

In the above table, netent<\/i> in race:netent<\/i> signifies that if any of the functions setnetent<\/b>(), getnetent<\/b>(), or endnetent<\/b>() are used in parallel in different threads of a program, then data races could occur.<\/p>\n

CONFORMING TO <\/a> <\/h2>\n

POSIX.1-2001, POSIX.1-2008, 4.3BSD.<\/p>\n

NOTES <\/a> <\/h2>\n

In glibc versions before 2.2, the net<\/i> argument of getnetbyaddr<\/b>() was of type long<\/i>.<\/p>\n

SEE ALSO <\/a> <\/h2>\n

getnetent_r<\/b>(3), getprotoent<\/b>(3), getservent<\/b>(3)
RFC\u00a01101<\/p>\n

COLOPHON <\/a> <\/h2>\n

This page is part of release 5.10 of the Linux man-pages<\/i> project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https:\/\/www.kernel.org\/doc\/man\u2212pages\/.<\/p>\n

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