The function setenv() and unsetenv() are thread unsafe.
Signed-off-by: Ma Shimiao <mashimiao.fnst@xxxxxxxxxxxxxx>
---
man3/setenv.3 | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/man3/setenv.3 b/man3/setenv.3
index 6683d59..e28bf0d 100644
--- a/man3/setenv.3
+++ b/man3/setenv.3
@@ -125,6 +125,19 @@ or contains an \(aq=\(aq character.
.TP
.B ENOMEM
Insufficient memory to add a new variable to the environment.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lb lb lb
+l l l.
+Interface Attribute Value
+T{
+.BR setenv (),
+.BR unsetenv ()
+T} Thread safety MT-Unsafe const:env
+.TE
.SH CONFORMING TO
4.3BSD, POSIX.1-2001.
.SH NOTES
--
1.8.3.1
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