diff options
Diffstat (limited to 'sysdeps/generic/bits/select.h')
| -rw-r--r-- | sysdeps/generic/bits/select.h | 13 |
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)) |