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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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ENDHOSTENT(3P) POSIX Programmer's Manual ENDHOSTENT(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.
endhostent, gethostent, sethostent — network host database
functions
#include <netdb.h>
void endhostent(void);
struct hostent *gethostent(void);
void sethostent(int stayopen);
These functions shall retrieve information about hosts. This
information is considered to be stored in a database that can be
accessed sequentially or randomly. The implementation of this
database is unspecified.
Note: In many cases this database is implemented by the Domain
Name System, as documented in RFC 1034, RFC 1035, and
RFC 1886.
The sethostent() function shall open a connection to the database
and set the next entry for retrieval to the first entry in the
database. If the stayopen argument is non-zero, the connection
shall not be closed by a call to gethostent(), and the
implementation may maintain an open file descriptor.
The gethostent() function shall read the next entry in the
database, opening and closing a connection to the database as
necessary.
Entries shall be returned in hostent structures.
The endhostent() function shall close the connection to the
database, releasing any open file descriptor.
These functions need not be thread-safe.
Upon successful completion, the gethostent() function shall
return a pointer to a hostent 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.
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
gethostent(). The returned pointer, and pointers within the
structure, might also be invalidated if the calling thread is
terminated.
No errors are defined for endhostent(), gethostent(), and
sethostent().
The following sections are informative.
None.
None.
None.
None.
endservent(3p)
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 ENDHOSTENT(3P)
Pages that refer to this page: netdb.h(0p), endservent(3p), gethostent(3p), htonl(3p), inet_addr(3p), sethostent(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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