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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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ENDPROTOENT(3P) POSIX Programmer's Manual ENDPROTOENT(3P)
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.
endprotoent, getprotobyname, getprotobynumber, getprotoent,
setprotoent — network protocol database functions
#include <netdb.h>
void endprotoent(void);
struct protoent *getprotobyname(const char *name);
struct protoent *getprotobynumber(int proto);
struct protoent *getprotoent(void);
void setprotoent(int stayopen);
These functions shall retrieve information about protocols. This
information is considered to be stored in a database that can be
accessed sequentially or randomly. The implementation of this
database is unspecified.
The setprotoent() function shall open a connection to the
database, and set the next entry to the first entry. If the
stayopen argument is non-zero, the connection to the network
protocol database shall not be closed after each call to
getprotoent() (either directly, or indirectly through one of the
other getproto*() functions), and the implementation may maintain
an open file descriptor for the database.
The getprotobyname() function shall search the database from the
beginning and find the first entry for which the protocol name
specified by name matches the p_name member, opening and closing
a connection to the database as necessary.
The getprotobynumber() function shall search the database from
the beginning and find the first entry for which the protocol
number specified by proto matches the p_proto member, opening and
closing a connection to the database as necessary.
The getprotoent() function shall read the next entry of the
database, opening and closing a connection to the database as
necessary.
The getprotobyname(), getprotobynumber(), and getprotoent()
functions shall each return a pointer to a protoent structure,
the members of which shall contain the fields of an entry in the
network protocol database.
The endprotoent() function shall close the connection to the
database, releasing any open file descriptor.
These functions need not be thread-safe.
Upon successful completion, getprotobyname(), getprotobynumber(),
and getprotoent() return a pointer to a protoent 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.
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
getprotobyname(), getprotobynumber(), or getprotoent(). The
returned pointer, and pointers within the structure, might also
be invalidated if the calling thread is terminated.
No errors are defined.
The following sections are informative.
None.
None.
None.
None.
The Base Definitions volume of POSIX.1‐2017, netdb.h(0p)
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 .
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 .
IEEE/The Open Group 2017 ENDPROTOENT(3P)
Pages that refer to this page: netdb.h(0p), endservent(3p), getprotobyname(3p), getsockopt(3p), setprotoent(3p), setsockopt(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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