Alfred Perlstein writes:
> Seriously, there's some dispute on the type that 'shm_nattch' is,
> under Solaris it's "shmatt_t" (unsigned long afaik), under FreeBSD
> it's 'short' (i should fix this. :)).
What I don't like is that my /usr/include/sys/shm.h (through other
headers) has:
typedef unsigned long int shmatt_t;
/* Data structure describing a set of semaphores. */
struct shmid_ds { struct ipc_perm shm_perm; /* operation permission struct */ size_t shm_segsz;
/* size of segment in bytes */ __time_t shm_atime; /* time of last shmat() */ unsigned long
int__unused1; __time_t shm_dtime; /* time of last shmdt() */ unsigned long int __unused2;
__time_tshm_ctime; /* time of last change by shmctl() */ unsigned long int __unused3; __pid_t
shm_cpid; /* pid of creator */ __pid_t shm_lpid; /* pid of last shmop */
shmatt_tshm_nattch; /* number of current attaches */ unsigned long int __unused4; unsigned long int
__unused5;};
whereas /usr/src/linux/include/shm.h has:
struct shmid_ds { struct ipc_perm shm_perm; /* operation perms */ int
shm_segsz; /* size of segment (bytes) */ __kernel_time_t shm_atime; /* last attach time */
__kernel_time_t shm_dtime; /* last detach time */ __kernel_time_t shm_ctime; /* last
changetime */ __kernel_ipc_pid_t shm_cpid; /* pid of creator */ __kernel_ipc_pid_t
shm_lpid; /* pid of last operator */ unsigned short shm_nattch; /* no. of current attaches */
unsigned short shm_unused; /* compatibility */ void *shm_unused2; /* ditto -
usedby DIPC */ void *shm_unused3; /* unused */
};
Not only note the shm_nattch type, but also shm_segsz, and the "unused"
fields in between. I don't know a thing about the Linux kernel sources,
but this doesn't seem right.
--
Peter Eisentraut peter_e@gmx.net http://yi.org/peter-e/
