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-rw-r--r--posix/unistd.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index 405638ce79..4722f7fc5c 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -1138,11 +1138,15 @@ extern void swab (const void *__restrict __from, void *__restrict __to,
#endif
-/* The Single Unix specification demands this prototype to be here.
- It is also found in <stdio.h>. */
+/* Prior to Issue 6, the Single Unix Specification required these
+ prototypes to appear in this header. They are also found in
+ <stdio.h>. */
#if defined __USE_XOPEN && !defined __USE_XOPEN2K
/* Return the name of the controlling terminal. */
extern char *ctermid (char *__s) __THROW;
+
+/* Return the name of the current user. */
+extern char *cuserid (char *__s);
#endif