[qemu-aarch64-static has the same problem but qemu-armv7-sstatic does not. The
context here
is FreeBSD head -r341836 based and ports head -r488859 based.]
Note: I assume that "struct target_freebsd_flock" is meant to match the memory
layout
of the target's native "struct flock". Otherwise the reported differences
below could be irrelevant.
For amd64 and aarch64 the following code:
printf("sizeof(struct flock) = %lu\n", (unsigned long) sizeof(struct
flock));
printf("l_start %lu\n", (unsigned long) offsetof(struct flock,
l_start));
printf("l_len %lu\n", (unsigned long) offsetof(struct flock, l_len));
printf("l_pid %lu\n", (unsigned long) offsetof(struct flock, l_pid));
printf("l_type %lu\n", (unsigned long) offsetof(struct flock, l_type));
printf("l_whence %lu\n", (unsigned long) offsetof(struct flock,
l_whence));
printf("l_sysid %lu\n", (unsigned long) offsetof(struct flock,
l_sysid));
produces:
sizeof(struct flock) = 32
l_start 0
l_len 8
l_pid 16
l_type 20
l_whence 22
l_sysid 24
However gdb reports for qemu-x86_64-static and qemu-aarch64-static
and qemu-arm-static:
(gdb) p/d sizeof(struct target_freebsd_flock)
$10 = 28
(gdb) p/d &((struct target_freebsd_flock *)0)->l_start
$11 = 0
(gdb) p/d &((struct target_freebsd_flock *)0)->l_len
$12 = 8
(gdb) p/d &((struct target_freebsd_flock *)0)->l_pid
$13 = 16
(gdb) p/d &((struct target_freebsd_flock *)0)->l_type
$14 = 20
(gdb) p/d &((struct target_freebsd_flock *)0)->l_whence
$15 = 22
(gdb) p/d &((struct target_freebsd_flock *)0)->l_sysid
$16 = 24
So only the overall size is different for this information. But:
struct target_freebsd_flock {
int64_t l_start;
int64_t l_len;
int32_t l_pid;
int16_t l_type;
int16_t l_whence;
int32_t l_sysid;
} QEMU_PACKED;
with a potential packed vs. /usr/include/sys/fcntl.h :
struct flock {
off_t l_start; /* starting offset */
off_t l_len; /* len = 0 means until end of file */
pid_t l_pid; /* lock owner */
short l_type; /* lock type: read/write, etc. */
short l_whence; /* type of l_start */
int l_sysid; /* remote system id or zero for local */
};
with no potential __packed.
===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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