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-rw-r--r--ChangeLog8
-rw-r--r--manual/errno.texi18
2 files changed, 20 insertions, 6 deletions
diff --git a/ChangeLog b/ChangeLog
index cda9af2..c7873da 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2015-03-06 Rical Jasan <ricaljasan@pacific.net>
+
+ * manual/errno.texi (Error Messages): Complete example function
+ by adding missing #define.
+ (program_invocation_name): Add statement indicating GNU
+ extension and reference which header file declares the variable.
+ (program_invocation_short_name): Likewise.
+
2015-03-06 Mike Frysinger <vapier@gentoo.org>
* manual/errno.texi (Error Messages): Delete strerror ISO C89
diff --git a/manual/errno.texi b/manual/errno.texi
index 315320d..1068be3 100644
--- a/manual/errno.texi
+++ b/manual/errno.texi
@@ -1377,6 +1377,8 @@ This variable's value is the name that was used to invoke the program
running in the current process. It is the same as @code{argv[0]}. Note
that this is not necessarily a useful file name; often it contains no
directory names. @xref{Program Arguments}.
+
+This variable is a GNU extension and is declared in @file{errno.h}.
@end deftypevar
@comment errno.h
@@ -1386,17 +1388,19 @@ This variable's value is the name that was used to invoke the program
running in the current process, with directory names removed. (That is
to say, it is the same as @code{program_invocation_name} minus
everything up to the last slash, if any.)
+
+This variable is a GNU extension and is declared in @file{errno.h}.
@end deftypevar
The library initialization code sets up both of these variables before
calling @code{main}.
-@strong{Portability Note:} These two variables are GNU extensions. If
-you want your program to work with non-GNU libraries, you must save the
-value of @code{argv[0]} in @code{main}, and then strip off the directory
-names yourself. We added these extensions to make it possible to write
-self-contained error-reporting subroutines that require no explicit
-cooperation from @code{main}.
+@strong{Portability Note:} If you want your program to work with
+non-GNU libraries, you must save the value of @code{argv[0]} in
+@code{main}, and then strip off the directory names yourself. We
+added these extensions to make it possible to write self-contained
+error-reporting subroutines that require no explicit cooperation from
+@code{main}.
Here is an example showing how to handle failure to open a file
correctly. The function @code{open_sesame} tries to open the named file
@@ -1410,6 +1414,8 @@ save it in a local variable instead, because those other library
functions might overwrite @code{errno} in the meantime.
@smallexample
+#define _GNU_SOURCE
+
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>