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Diffstat (limited to 'sysdeps/generic/bits/select.h')
-rw-r--r--sysdeps/generic/bits/select.h13
1 files changed, 10 insertions, 3 deletions
diff --git a/sysdeps/generic/bits/select.h b/sysdeps/generic/bits/select.h
index 613919577c..7803335499 100644
--- a/sysdeps/generic/bits/select.h
+++ b/sysdeps/generic/bits/select.h
@@ -21,9 +21,16 @@
#endif
-/* This line MUST be split! Otherwise m4 will not change it. */
-#define __FD_ZERO(set) \
- ((void) memset ((__ptr_t) (set), 0, sizeof (fd_set)))
+/* This line MUST be split! Otherwise m4 will not change it.
+
+ We don't use `memset' because this would require a prototype and
+ the array isn't too big. */
+#define __FD_ZERO(set) \
+ do { \
+ unsigned int __i; \
+ for (__i = 0; __i < sizeof (__fd_set) / sizeof (__fd_mask); ++__i) \
+ ((__fd_mask *) set)[__i] = '\0'; \
+ } while (0)
#define __FD_SET(d, set) ((set)->fds_bits[__FDELT(d)] |= __FDMASK(d))
#define __FD_CLR(d, set) ((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d))
#define __FD_ISSET(d, set) ((set)->fds_bits[__FDELT(d)] & __FDMASK(d))