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+'\" et
+.TH ENDSERVENT "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+endservent,
+getservbyname,
+getservbyport,
+getservent,
+setservent
+\(em network services database functions
+.SH SYNOPSIS
+.LP
+.nf
+#include <netdb.h>
+.P
+void endservent(void);
+struct servent *getservbyname(const char *\fIname\fP, const char *\fIproto\fP);
+struct servent *getservbyport(int \fIport\fP, const char *\fIproto\fP);
+struct servent *getservent(void);
+void setservent(int \fIstayopen\fP);
+.fi
+.SH DESCRIPTION
+These functions shall retrieve information about network services. This
+information is considered to be stored in a database that can be
+accessed sequentially or randomly. The implementation of this database
+is unspecified.
+.P
+The
+\fIsetservent\fR()
+function shall open a connection to the database, and set the next
+entry to the first entry. If the
+.IR stayopen
+argument is non-zero, the
+.IR net
+database shall not be closed after each call to the
+\fIgetservent\fR()
+function (either directly, or indirectly through one of the other
+.IR getserv* (\|)
+functions), and the implementation may maintain an open file descriptor
+for the database.
+.P
+The
+\fIgetservent\fR()
+function shall read the next entry of the database, opening and closing
+a connection to the database as necessary.
+.P
+The
+\fIgetservbyname\fR()
+function shall search the database from the beginning and find the
+first entry for which the service name specified by
+.IR name
+matches the
+.IR s_name
+member and the protocol name specified by
+.IR proto
+matches the
+.IR s_proto
+member, opening and closing a connection to the database as necessary.
+If
+.IR proto
+is a null pointer, any value of the
+.IR s_proto
+member shall be matched.
+.P
+The
+\fIgetservbyport\fR()
+function shall search the database from the beginning and find the
+first entry for which the port specified by
+.IR port
+matches the
+.IR s_port
+member and the protocol name specified by
+.IR proto
+matches the
+.IR s_proto
+member, opening and closing a connection to the database as necessary.
+If
+.IR proto
+is a null pointer, any value of the
+.IR s_proto
+member shall be matched. The
+.IR port
+argument shall be a value obtained by converting a
+.BR uint16_t
+in network byte order to
+.BR int .
+.P
+The
+\fIgetservbyname\fR(),
+\fIgetservbyport\fR(),
+and
+\fIgetservent\fR()
+functions shall each return a pointer to a
+.BR servent
+structure, the members of which shall contain the fields of an entry in
+the network services database.
+.P
+The
+\fIendservent\fR()
+function shall close the database, releasing any open file descriptor.
+.P
+These functions need not be thread-safe.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIgetservbyname\fR(),
+\fIgetservbyport\fR(),
+and
+\fIgetservent\fR()
+return a pointer to a
+.BR servent
+structure if the requested entry was found, and a null pointer if the
+end of the database was reached or the requested entry was not found.
+Otherwise, a null pointer is returned.
+.P
+The application shall not modify the structure to which the return
+value points, nor any storage areas pointed to by pointers within the
+structure. The returned pointer, and pointers within the structure,
+might be invalidated or the structure or the storage areas might be
+overwritten by a subsequent call to
+\fIgetservbyname\fR(),
+\fIgetservbyport\fR(),
+or
+\fIgetservent\fR().
+The returned pointer, and pointers within the structure, might also be
+invalidated if the calling thread is terminated.
+.SH ERRORS
+No errors are defined.
+.LP
+.IR "The following sections are informative."
+.SH "EXAMPLES"
+None.
+.SH "APPLICATION USAGE"
+The
+.IR port
+argument of
+\fIgetservbyport\fR()
+need not be compatible with the port values of all address families.
+.SH "RATIONALE"
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIendhostent\fR\^(\|)",
+.IR "\fIendprotoent\fR\^(\|)",
+.IR "\fIhtonl\fR\^(\|)",
+.IR "\fIinet_addr\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<netdb.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .