From 3283f711132eaadc4f04bd8c1d84c910c29ba066 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Tue, 30 Jun 2020 09:20:48 -0300 Subject: 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 Reviewed-by: Carlos O'Donell Reviewed-by: Alistair Francis Tested-by: Alistair Francis --- include/sys/msg.h | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) (limited to 'include/sys/msg.h') diff --git a/include/sys/msg.h b/include/sys/msg.h index 43ec5b9472..a092d0e216 100644 --- a/include/sys/msg.h +++ b/include/sys/msg.h @@ -1,11 +1 @@ -#ifndef _SYS_MSG_H -#include - -#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); -#endif - -#endif +#include_next -- cgit v1.2.3