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<!-- Copyright (C) 2003 Red Hat, Inc. --><!-- This material may be distributed only subject to the terms --><!-- and conditions set forth in the Open Publication License, v1.0 --><!-- or later (the latest version is presently available at --><!-- http://www.opencontent.org/openpub/). --><!-- Distribution of the work or derivative of the work in any --><!-- standard (paper) book form is prohibited unless prior --><!-- permission is obtained from the copyright holder. --><HTML><HEAD><TITLE>getprotoent</TITLE><meta name="MSSmartTagsPreventParsing" content="TRUE"><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="eCos Reference Manual"HREF="ecos-ref.html"><LINKREL="UP"TITLE="TCP/IP Library Reference"HREF="tcpip-library-reference.html"><LINKREL="PREVIOUS"TITLE="getnetent"HREF="net-common-tcpip-manpages-getnetent.html"><LINKREL="NEXT"TITLE="getrrsetbyname"HREF="net-common-tcpip-manpages-getrrsetbyname.html"></HEAD><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">eCos Reference Manual</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="net-common-tcpip-manpages-getnetent.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 38. TCP/IP Library Reference</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="net-common-tcpip-manpages-getrrsetbyname.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="NET-COMMON-TCPIP-MANPAGES-GETPROTOENT">getprotoent</H1><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN">GETPROTOENT(3) System Library Functions Manual GETPROTOENT(3)NAME getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent - get protocol entrySYNOPSIS #include <netdb.h> struct protoent * getprotoent(void); struct protoent * getprotobyname(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 contain- ing the broken-out fields of a line in the network protocol database, /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 database will not be closed after each call to getprotobyname() or getprotobynumber(). The endprotoent() function closes the file. The getprotobyname() and getprotobynumber() functions 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 (0) returned on EOF or error.FILES /etc/protocolsSEE ALSO protocols(5)HISTORY The getprotoent(), getprotobynumber(), getprotobyname(), setprotoent(), and endprotoent() functions appeared in 4.2BSD.BUGS These functions use a static data space; if the data is needed for future use, it should be copied before any subsequent calls overwrite it. Only the Internet protocols are currently understood.BSD June 4, 1993 BSD </PRE></TD></TR></TABLE></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="net-common-tcpip-manpages-getnetent.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="ecos-ref.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="net-common-tcpip-manpages-getrrsetbyname.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">getnetent</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="tcpip-library-reference.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">getrrsetbyname</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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