diff options
Diffstat (limited to 'sys/kern/sys_generic.c')
| -rw-r--r-- | sys/kern/sys_generic.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/sys/kern/sys_generic.c b/sys/kern/sys_generic.c index b34af61..eaefd9c 100644 --- a/sys/kern/sys_generic.c +++ b/sys/kern/sys_generic.c @@ -878,9 +878,10 @@ kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou, sbp = selbits; #define getbits(name, x) \ do { \ - if (name == NULL) \ + if (name == NULL) { \ ibits[x] = NULL; \ - else { \ + obits[x] = NULL; \ + } else { \ ibits[x] = sbp + nbufbytes / 2 / sizeof *sbp; \ obits[x] = sbp; \ sbp += ncpbytes / sizeof *sbp; \ @@ -895,6 +896,28 @@ kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou, getbits(fd_ou, 1); getbits(fd_ex, 2); #undef getbits + +#if BYTE_ORDER == BIG_ENDIAN && defined(__LP64__) + /* + * XXX: swizzle_fdset assumes that if abi_nfdbits != NFDBITS, + * we are running under 32-bit emulation. This should be more + * generic. + */ +#define swizzle_fdset(bits) \ + if (abi_nfdbits != NFDBITS && bits != NULL) { \ + int i; \ + for (i = 0; i < ncpbytes / sizeof *sbp; i++) \ + bits[i] = (bits[i] >> 32) | (bits[i] << 32); \ + } +#else +#define swizzle_fdset(bits) +#endif + + /* Make sure the bit order makes it through an ABI transition */ + swizzle_fdset(ibits[0]); + swizzle_fdset(ibits[1]); + swizzle_fdset(ibits[2]); + if (nbufbytes != 0) bzero(selbits, nbufbytes / 2); @@ -941,6 +964,13 @@ done: error = EINTR; if (error == EWOULDBLOCK) error = 0; + + /* swizzle bit order back, if necessary */ + swizzle_fdset(obits[0]); + swizzle_fdset(obits[1]); + swizzle_fdset(obits[2]); +#undef swizzle_fdset + #define putbits(name, x) \ if (name && (error2 = copyout(obits[x], name, ncpubytes))) \ error = error2; |
