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FreeBSD 11.0 - man page for endprotoent (freebsd section 3)

GETPROTOENT(3)						   BSD Library Functions Manual 					    GETPROTOENT(3)

NAME
getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent -- get protocol entry
LIBRARY
Standard C Library (libc, -lc)
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(), getprotobyname(), and getprotobynumber() functions each return a pointer to an object with the following structure con- taining the broken-out fields of a line in the network protocol data base, /etc/protocols. struct protoent { char *p_name; /* official name of protocol */ char **p_aliases; /* alias list */ int p_proto; /* protocol number */ }; The members of this structure are: p_name The official name of the protocol. p_aliases A zero terminated list of alternate names for the protocol. p_proto The protocol number. The getprotoent() function reads the next line of the file, opening the file if necessary. The setprotoent() function opens and rewinds the file. If the stayopen flag is non-zero, the net data base will not be closed after each call to getprotobyname() or getprotobynumber(). The endprotoent() function closes the file. The getprotobyname() function and getprotobynumber() sequentially search from the beginning of the file until a matching protocol name or protocol number is found, or until EOF is encountered.
RETURN VALUES
Null pointer returned on EOF or error.
FILES
/etc/protocols
SEE ALSO
protocols(5)
HISTORY
The getprotoent(), getprotobynumber(), getprotobyname(), setprotoent(), and endprotoent() functions appeared in 4.2BSD.
BUGS
These functions use a thread-specific data space; if the data is needed for future use, it should be copied before any subsequent calls over- write it. Only the Internet protocols are currently understood.
BSD
June 4, 1993 BSD

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