Messages in this thread | | | Date | Thu, 19 Jan 2012 11:58:22 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [dm-devel] dmsetup fails on latest kernel |
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On 01/19/2012 10:06 AM, Bryn M. Reeves wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > 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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