diff options
| author | Mark Johnston <markj@FreeBSD.org> | 2019-07-16 16:28:50 +0000 |
|---|---|---|
| committer | Mark Johnston <markj@FreeBSD.org> | 2019-07-16 16:28:50 +0000 |
| commit | 07cf2bb6938d765f0c2f2e4b29f2f21cd276a0fb (patch) | |
| tree | 8e6daeeb2646c7f89fa12c1eabba7d219ece2ea9 /lib/libnv | |
| parent | ccf7f8460be77b489592fb5076f2ff18299a0c82 (diff) | |
Notes
Diffstat (limited to 'lib/libnv')
| -rw-r--r-- | lib/libnv/msgio.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/libnv/msgio.c b/lib/libnv/msgio.c index ee64ce8c8609..7cec4c898f04 100644 --- a/lib/libnv/msgio.c +++ b/lib/libnv/msgio.c @@ -63,7 +63,13 @@ __FBSDID("$FreeBSD$"); /* Linux: arbitrary size, but must be lower than SCM_MAX_FD. */ #define PKG_MAX_SIZE ((64U - 1) * CMSG_SPACE(sizeof(int))) #else -#define PKG_MAX_SIZE (MCLBYTES / CMSG_SPACE(sizeof(int)) - 1) +/* + * To work around limitations in 32-bit emulation on 64-bit kernels, use a + * machine-independent limit on the number of FDs per message. Each control + * message contains 1 FD and requires 12 bytes for the header, 4 pad bytes, + * 4 bytes for the descriptor, and another 4 pad bytes. + */ +#define PKG_MAX_SIZE (MCLBYTES / 24) #endif static int |