On 01/19/2012 10:06 AM, Bryn M. Reeves wrote:
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On 01/19/2012 04:10 PM, Kasatkin, Dmitry wrote:
It seems "semget" is missing from:
arch/x86/syscalls/syscall_32.tbl But it presents in:
arch/x86/syscalls/syscall_64.tbl
Is it a bug then?
Maybe; I noticed that too but it's also missing in the old x86
unistd_32.h.
I thought Linux only provided the ipc(2) call - glibc sources seem to
confirm that (sysdeps/unix/sysv/linux/semget.c).
sys_sem* and friends are present in include/asm-generic/unistd.h so
maybe these values just need to be propagated to syscall_32.tbl?
Actually there's a bunch of SysV IPC calls defined in syscall_64.tbl
that are not present in syscall_32.tbl:
$ egrep 'shm|sem|msg[a-z]' arch/x86/syscalls/syscall_32.tbl
$ egrep 'shm|sem|msg[a-z]' arch/x86/syscalls/syscall_64.tbl
29 64 shmget sys_shmget
30 64 shmat sys_shmat
31 64 shmctl sys_shmctl
64 64 semget sys_semget
65 64 semop sys_semop
66 64 semctl sys_semctl
67 64 shmdt sys_shmdt
68 64 msgget sys_msgget
69 64 msgsnd sys_msgsnd
70 64 msgrcv sys_msgrcv
71 64 msgctl sys_msgctl
220 64 semtimedop sys_semtimedop
But sys_ipc is there:
$ grep sys_ipc arch/x86/syscalls/syscall_32.tbl
117 i386 ipc sys_ipc sys32_ipc
No, the i386 ABI uses several system call multiplexes (sys_ipc,
sys_socketcall) which are deprecated for new ABIs. x86-64 and other new
ABIs use plain system calls. Thus, this is all as one should expect;
the right thing to do is to compare against the old 32-bit system call
table.
-hpa
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