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| author | Florian Weimer <fweimer@redhat.com> | 2014-02-25 14:56:10 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2014-02-25 14:56:10 +0100 |
| commit | 4cbf380ce948ca15a965a78f0c1a092cf5956792 (patch) | |
| tree | 44f72a303346dff92c2051269b3dad3bbd4a7160 /misc/sys/select.h | |
| parent | 80a56cc3ee45d4a2a1c3ec5e67ff359a7b380fb6 (diff) | |
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misc/sys/select.h (__FD_MASK): Avoid signed integer overflow.
Shifting into the sign position is currently supported as a GCC
extension, but explicitly subjected to future changes. Computation
in the unsigned type followed by a cast to the signed type is a GCC
extension that will be available forever.
Diffstat (limited to 'misc/sys/select.h')
| -rw-r--r-- | misc/sys/select.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/misc/sys/select.h b/misc/sys/select.h index fd13bab41a..941588d9c4 100644 --- a/misc/sys/select.h +++ b/misc/sys/select.h @@ -58,7 +58,7 @@ typedef long int __fd_mask; /* It's easier to assume 8-bit bytes than to get CHAR_BIT. */ #define __NFDBITS (8 * (int) sizeof (__fd_mask)) #define __FD_ELT(d) ((d) / __NFDBITS) -#define __FD_MASK(d) ((__fd_mask) 1 << ((d) % __NFDBITS)) +#define __FD_MASK(d) ((__fd_mask) (1UL << ((d) % __NFDBITS))) /* fd_set for select and pselect. */ typedef struct |