glibc/sysdeps/unix/sysv/linux/include/sys/msg.h

#ifndef _SYS_MSG_H
#include <sysvipc/sys/msg.h>

#ifndef _ISOMAC
extern ssize_t __libc_msgrcv (int msqid, void *msgp, size_t msgsz,
			      long int msgtyp, int msgflg);
extern int __libc_msgsnd (int msqid, const void *msgp, size_t msgsz,
			  int msgflg);

# if __TIMESIZE == 64
#  define __msgctl64 __msgctl
# else
extern int __msgctl64 (int msqid, int cmd, struct __msqid64_ds *buf);
libc_hidden_proto (__msgctl64);
# endif

#endif

#endif
sysv: linux: Add 64-bit time_t variant for msgctl 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> 2020-06-30 14:20:48 +02:00			`#ifndef _SYS_MSG_H`
			`#include <sysvipc/sys/msg.h>`

			`#ifndef _ISOMAC`
			`extern ssize_t __libc_msgrcv (int msqid, void *msgp, size_t msgsz,`
			`long int msgtyp, int msgflg);`
			`extern int __libc_msgsnd (int msqid, const void *msgp, size_t msgsz,`
			`int msgflg);`

			`# if __TIMESIZE == 64`
			`# define __msgctl64 __msgctl`
			`# else`
			`extern int __msgctl64 (int msqid, int cmd, struct __msqid64_ds *buf);`
			`libc_hidden_proto (__msgctl64);`
			`# endif`

			`#endif`

			`#endif`