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-rw-r--r--doc/info/chap/error-reporting.texinfo11
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/info/chap/error-reporting.texinfo b/doc/info/chap/error-reporting.texinfo
index 7769015..6496019 100644
--- a/doc/info/chap/error-reporting.texinfo
+++ b/doc/info/chap/error-reporting.texinfo
@@ -122,6 +122,17 @@ the value on @code{errno}, its value must
be saved if there are function calls between
the failure and the call to @code{perror}.
+@lvindex program_invocation_name
+@lvindex program_invocation_short_name
+It is customary to set @code{prefix} to
+a value equivalent to @code{program_invocation_name},
+or alternatively @code{program_invocation_short_name}.
+Sometiems, the name of the called function is
+used, this is to simplify debugging. But the
+standard is that programs shall print there
+them when reporting an error so that the user
+knows that program failed.
+
TODO: Not implemented.
@item char* strerror(int errnum)