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3283f71113
To provide a y2038 safe interface a new symbol __msgctl64 is added
and __msgctl is change to call it instead (it adds some extra buffer
coping for the 32 bit time_t implementation).
Two new structures are added:
1. kernel_msqid64_ds: used internally only on 32-bit architectures
to issue the syscall. A handful of architectures (hppa, i386, mips,
powerpc32, and sparc32) require specific implementations due to
their kernel ABI.
2. msqid_ds64: this is only for __TIMESIZE != 64 to use along with
the 64-bit msgctl. It is different than the kernel struct because
the exported 64-bit time_t might require different alignment
depending on the architecture ABI.
So the resulting implementation does:
1. For 64-bit architectures it assumes msqid_ds already contains
64-bit time_t fields and will result in just the __msgctl symbol
using the __msgctl64 code. The msgid_ds argument is passed as-is
to the syscall.
2. For 32-bit architectures with default 64-bit time_t (newer ABIs
such riscv32 or arc), it will also result in only one exported
symbol but with the required high/low time handling.
3. Finally for 32-bit architecture with both 32-bit and 64-bit time_t
support we follow the already set way to provide one symbol with
64-bit time_t support and implement the 32-bit time_t support using
the 64-bit time_t.
The default 32-bit symbol will allocate and copy the msqid_ds
over multiple buffers, but this should be deprecated in favor
of the __msgctl64 anyway.
Checked on i686-linux-gnu and x86_64-linux-gnu. I also did some sniff
tests on powerpc, powerpc64, mips, mips64, armhf, sparcv9, and
sparc64.
Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Tested-by: Alistair Francis <alistair.francis@wdc.com>
22 lines
488 B
C
22 lines
488 B
C
#ifndef _SYS_MSG_H
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#include <sysvipc/sys/msg.h>
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#ifndef _ISOMAC
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extern ssize_t __libc_msgrcv (int msqid, void *msgp, size_t msgsz,
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long int msgtyp, int msgflg);
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extern int __libc_msgsnd (int msqid, const void *msgp, size_t msgsz,
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int msgflg);
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# include <bits/types/struct_msqid64_ds.h>
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# if __TIMESIZE == 64
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# define __msgctl64 __msgctl
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# else
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extern int __msgctl64 (int msqid, int cmd, struct __msqid64_ds *buf);
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libc_hidden_proto (__msgctl64);
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# endif
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#endif
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#endif
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