Visit The New, Modern Unix Linux Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #670
Difficulty: Medium
Fourteen channels are designated in the 2.4 GHz range, spaced 5 MHz apart from each other except for a 12 MHz space before channel 14.
True or False?
Linux & Unix Commands - Search Man Pages

setprotoent(3) [linux man page]

GETPROTOENT(3)						     Linux Programmer's Manual						    GETPROTOENT(3)

NAME
getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent - get protocol entry SYNOPSIS
#include <netdb.h> struct protoent *getprotoent(void); struct protoent *getprotobyname(const char *name); struct protoent *getprotobynumber(int proto); void setprotoent(int stayopen); void endprotoent(void); DESCRIPTION
The getprotoent() function reads the next entry from the protocols database (see protocols(5)) and returns a protoent structure containing the broken-out fields from the entry. A connection is opened to the database if necessary. The getprotobyname() function returns a protoent structure for the entry from the database that matches the protocol name name. A connec- tion is opened to the database if necessary. The getprotobynumber() function returns a protoent structure for the entry from the database that matches the protocol number number. A connection is opened to the database if necessary. The setprotoent() function opens a connection to the database, and sets the next entry to the first entry. If stayopen is nonzero, then the connection to the database will not be closed between calls to one of the getproto*() functions. The endprotoent() function closes the connection to the database. The protoent structure is defined in <netdb.h> as follows: struct protoent { char *p_name; /* official protocol name */ char **p_aliases; /* alias list */ int p_proto; /* protocol number */ } The members of the protoent structure are: p_name The official name of the protocol. p_aliases A NULL-terminated list of alternative names for the protocol. p_proto The protocol number. RETURN VALUE
The getprotoent(), getprotobyname() and getprotobynumber() functions return a pointer to a statically allocated protoent structure, or a NULL pointer if an error occurs or the end of the file is reached. FILES
/etc/protocols protocol database file CONFORMING TO
4.3BSD, POSIX.1-2001. SEE ALSO
getnetent(3), getprotoent_r(3), getservent(3), protocols(5) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2008-08-19 GETPROTOENT(3)

Check Out this Related Man Page

GETPROTOENT(3)						     Linux Programmer's Manual						    GETPROTOENT(3)

NAME
getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent - get protocol entry SYNOPSIS
#include <netdb.h> struct protoent *getprotoent(void); struct protoent *getprotobyname(const char *name); struct protoent *getprotobynumber(int proto); void setprotoent(int stayopen); void endprotoent(void); DESCRIPTION
The getprotoent() function reads the next entry from the protocols database (see protocols(5)) and returns a protoent structure containing the broken-out fields from the entry. A connection is opened to the database if necessary. The getprotobyname() function returns a protoent structure for the entry from the database that matches the protocol name name. A connec- tion is opened to the database if necessary. The getprotobynumber() function returns a protoent structure for the entry from the database that matches the protocol number number. A connection is opened to the database if necessary. The setprotoent() function opens a connection to the database, and sets the next entry to the first entry. If stayopen is nonzero, then the connection to the database will not be closed between calls to one of the getproto*() functions. The endprotoent() function closes the connection to the database. The protoent structure is defined in <netdb.h> as follows: struct protoent { char *p_name; /* official protocol name */ char **p_aliases; /* alias list */ int p_proto; /* protocol number */ } The members of the protoent structure are: p_name The official name of the protocol. p_aliases A NULL-terminated list of alternative names for the protocol. p_proto The protocol number. RETURN VALUE
The getprotoent(), getprotobyname() and getprotobynumber() functions return a pointer to a statically allocated protoent structure, or a NULL pointer if an error occurs or the end of the file is reached. FILES
/etc/protocols protocol database file CONFORMING TO
4.3BSD, POSIX.1-2001. SEE ALSO
getnetent(3), getprotoent_r(3), getservent(3), protocols(5) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2008-08-19 GETPROTOENT(3)

Featured Tech Videos