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authorAndreas Jaeger <aj@suse.de>2012-04-08 19:43:41 +0200
committerAndreas Jaeger <aj@suse.de>2012-04-08 19:43:41 +0200
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Document return values of putenv and setenv
[BZ #10153] * manual/startup.texi (Environment Access): Describe return value for putenv and setenv.
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diff --git a/manual/startup.texi b/manual/startup.texi
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--- a/manual/startup.texi
+++ b/manual/startup.texi
@@ -335,6 +335,9 @@ definition is added to the environment. Otherwise, the @var{string} is
interpreted as the name of an environment variable, and any definition
for this variable in the environment is removed.
+If the function is successful it returns @code{0}. Otherwise the return
+value is nonzero and @code{errno} is set to indicate the error.
+
The difference to the @code{setenv} function is that the exact string
given as the parameter @var{string} is put into the environment. If the
user should change the string after the @code{putenv} call this will
@@ -364,6 +367,10 @@ the old entry is replaced by the new one.
Please note that you cannot remove an entry completely using this function.
+If the function is successful it returns @code{0}. Otherwise the
+environment is unchanged and the return value is @code{-1} and
+@code{errno} is set.
+
This function was originally part of the BSD library but is now part of
the Unix standard.
@end deftypefun