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the definition of the IPC_64 macro controls the interface between libc and the kernel through syscalls; it's not a public API. the meaning is rather obscure. long ago, Linux's sysvipc *id_ds structures used 16-bit uids/gids and wrong types for a few other fields. this was in the libc5 era, before glibc. the IPC_64 flag (64 is a misnomer; it's more like 32) tells the kernel to use the modern[-ish] versions of the structures. the definition of IPC_64 has nothing to do with whether the arch is 32- or 64-bit. rather, due to either historical accident or intentional obnoxiousness, the kernel only accepts and masks off the 0x100 IPC_64 flag conditional on CONFIG_ARCH_WANT_IPC_PARSE_VERSION, i.e. for archs that want to provide, or that accidentally provided, both. for archs which don't define this option, no masking is performed and commands with the 0x100 bit set will fail as invalid. so ultimately, the definition is just a matter of matching an arbitrary switch defined per-arch in the kernel.
19 lines
390 B
C
19 lines
390 B
C
#include "syscall.h"
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#define IPCOP_semop 1
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#define IPCOP_semget 2
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#define IPCOP_semctl 3
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#define IPCOP_semtimedop 4
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#define IPCOP_msgsnd 11
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#define IPCOP_msgrcv 12
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#define IPCOP_msgget 13
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#define IPCOP_msgctl 14
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#define IPCOP_shmat 21
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#define IPCOP_shmdt 22
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#define IPCOP_shmget 23
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#define IPCOP_shmctl 24
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#ifndef IPC_64
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#define IPC_64 0x100
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#endif
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