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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 connection 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 erβ ror occurs or the end of the file is reached. FILES /etc/protocols protocol database file ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). βββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ βInterface β Attribute β Value β βββββββββββββββββββββββββββββββΌββββββββββββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βgetprotoent() β Thread safety β MT-Unsafe race:protoent race:protoentbuf locale β βββββββββββββββββββββββββββββββΌββββββββββββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βgetprotobyname() β Thread safety β MT-Unsafe race:protobyname locale β βββββββββββββββββββββββββββββββΌββββββββββββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βgetprotobynumber() β Thread safety β MT-Unsafe race:protobynumber locale β βββββββββββββββββββββββββββββββΌββββββββββββββββΌβββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βsetprotoent(), endprotoent() β Thread safety β MT-Unsafe race:protoent locale β βββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ In the above table, protoent in race:protoent signifies that if any of the functions setprotoent(), getprotoent(), or endprotoent() are used in parallel in difβ ferent threads of a program, then data races could occur. CONFORMING TO POSIX.1-2001, POSIX.1-2008, 4.3BSD. SEE ALSO getnetent(3), getprotoent_r(3), getservent(3), protocols(5) GNU 2021-03-22 GETPROTOENT(3)