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authorUlrich Drepper <drepper@redhat.com>1999-06-30 17:16:08 +0000
committerUlrich Drepper <drepper@redhat.com>1999-06-30 17:16:08 +0000
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treea3427369d6193a9618eb9a0c7078a0832210c282 /manual/socket.texi
parent16848c985d9e4d6f8ca7a9c2c4ac711ef63835ec (diff)
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Update.
1999-06-28 Andreas Jaeger <aj@arthur.rhein-neckar.de> * inet/rcmd.c (__icheckhost): Test for gethostbyname_r result correctly. 1999-06-25 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/arith.texi (System V Number Conversion): Fix the description which confused pointer and value to pointer. Reported by Andries.Brouwer@cwi.nl. 1999-06-28 Andreas Jaeger <aj@arthur.rhein-neckar.de> * pwd/getpw.c (__getpw): Check for NULL result pointer. 1999-06-29 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/users.texi (Lookup User): Document POSIX return semantics for getpwuid_r and getgrgid_r. * manual/socket.texi (Host Names): Document that the result pointer is null in case of error or host not found and fix a typo. Give a small example.
Diffstat (limited to 'manual/socket.texi')
-rw-r--r--manual/socket.texi45
1 files changed, 37 insertions, 8 deletions
diff --git a/manual/socket.texi b/manual/socket.texi
index b9102c62e1..d77e556214 100644
--- a/manual/socket.texi
+++ b/manual/socket.texi
@@ -1284,13 +1284,42 @@ pointer and the size of the buffer in the @var{buf} and @var{buflen}
parameters.
A pointer to the buffer, in which the result is stored, is available in
-@code{*@var{result}} after the function call successfully returned.
-Success is signalled by a zero return value. If the function failed the
-return value is an error number. In addition to the errors defined for
-@code{gethostbyname} it can also be @code{ERANGE}. In this case the
-call should be repeated with a larger buffer. Additional error
-information is not stored in the global variable @code{h_errno} but
-instead in the object pointed to by @var{h_errnop}.
+@code{*@var{result}} after the function call successfully returned. If
+an error occurs or if no entry is found, the pointer @code{*var{result}
+is a null pointer. Success is signalled by a zero return value. If the
+function failed the return value is an error number. In addition to the
+errors defined for @code{gethostbyname} it can also be @code{ERANGE}.
+In this case the call should be repeated with a larger buffer.
+Additional error information is not stored in the global variable
+@code{h_errno} but instead in the object pointed to by @var{h_errnop}.
+
+Here's a small example:
+@smallexample
+struct hostent *
+gethostname (char *host)
+@{
+ struct hostent hostbuf, *hp;
+ size_t hstbuflen;
+ char *tmphstbuf;
+ int res;
+ int herr;
+
+ hstbuflen = 1024;
+ tmphstbuf = malloc (hstbuflen);
+
+ while ((res = gethostbyname_r (host, &hostbuf, tmphstbuf, hstbuflen,
+ &hp, &herr)) == ERANGE)
+ @{
+ /* Enlarge the buffer. */
+ hstbuflen *= 2;
+ tmphstbuf = realloc (tmphstbuf, hstbuflen);
+ @}
+ /* Check for errors. */
+ if (res || hp == NULL)
+ return NULL;
+ return hp->h_name;
+@}
+@end smallexample
@end deftypefun
@comment netdb.h
@@ -1314,7 +1343,7 @@ Internet address, use @code{AF_INET6}.
Similar to the @code{gethostbyname_r} function, the caller must provide
buffers for the result and memory used internally. In case of success
-the funciton returns zero. Otherwise the value is an error number where
+the function returns zero. Otherwise the value is an error number where
@code{ERANGE} has the special meaning that the caller-provided buffer is
too small.
@end deftypefun