{"id":6996,"date":"2022-12-20T19:34:36","date_gmt":"2022-12-20T22:34:36","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/getprotoent-man3\/"},"modified":"2022-12-20T19:34:36","modified_gmt":"2022-12-20T22:34:36","slug":"getprotoent-man3","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/getprotoent-man3\/","title":{"rendered":"GETPROTOENT (man3)"},"content":{"rendered":"

GETPROTOENT<\/h1>\n

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

\n

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

getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent \u2212 get protocol entry<\/p>\n

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

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

struct protoent *getprotoent(void);<\/b><\/p>\n

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

struct protoent *getprotobynumber(int<\/b> proto<\/i>);<\/b><\/p>\n

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

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

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

The getprotoent<\/b>() function reads the next entry from the protocols database (see protocols<\/b>(5)) and returns a protoent<\/i> structure containing the broken-out fields from the entry. A connection is opened to the database if necessary.<\/p>\n

The getprotobyname<\/b>() function returns a protoent<\/i> structure for the entry from the database that matches the protocol name name<\/i>. A connection is opened to the database if necessary.<\/p>\n

The getprotobynumber<\/b>() function returns a protoent<\/i> structure for the entry from the database that matches the protocol number number<\/i>. A connection is opened to the database if necessary.<\/p>\n

The setprotoent<\/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 getproto*<\/b>() functions.<\/p>\n

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

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

struct protoent {
char *p_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 protocol name bodies\/ usr\/
char **p_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 p_proto; \/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 protocol number bodies\/ usr\/
}<\/p>\n

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

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

<\/td>\n\n

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

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

p_aliases<\/i><\/p>\n

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

p_proto<\/i><\/p>\n

The protocol number.<\/p>\n

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

The getprotoent<\/b>(), getprotobyname<\/b>(), and getprotobynumber<\/b>() functions return a pointer to a statically allocated protoent<\/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\/protocols<\/i><\/p>\n

protocol 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, protoent<\/i> in race:protoent<\/i> signifies that if any of the functions setprotoent<\/b>(), getprotoent<\/b>(), or endprotoent<\/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

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

getnetent<\/b>(3), getprotoent_r<\/b>(3), getservent<\/b>(3), protocols<\/b>(5)<\/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

\n","protected":false},"excerpt":{"rendered":"

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