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-rw-r--r--support/xunistd.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/support/xunistd.h b/support/xunistd.h
index f0c741952f..0fe532a822 100644
--- a/support/xunistd.h
+++ b/support/xunistd.h
@@ -30,6 +30,9 @@ __BEGIN_DECLS
pid_t xfork (void);
pid_t xwaitpid (pid_t, int *status, int flags);
+/* Write the buffer. Retry on short writes. */
+void xwrite (int, const void *, size_t);
+
__END_DECLS
#endif /* SUPPORT_XUNISTD_H */