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Add rename support for libc_r.

This commit is contained in:
John Birrell 1998-06-09 22:43:34 +00:00
parent 5c9f7df5dc
commit 929140ffab
1 changed files with 50 additions and 1 deletions
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51
lib/libc/alpha/SYS.h
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@ -1,4 +1,4 @@
/* $Id$ */
/* $Id: SYS.h,v 1.1.1.1 1998/03/09 06:34:40 jb Exp $ */
/* From: NetBSD: SYS.h,v 1.5 1997/05/02 18:15:15 kleink Exp */
/*
@ -74,5 +74,54 @@ LEAF(label,0); /* XXX # of args? */ \
RET; \
END(label);
/*
* Design note:
*
* The macros PSYSCALL() and PRSYSCALL() are intended for use where a
* syscall needs to be renamed in the threaded library. When building
* a normal library, they default to the traditional SYSCALL() and
* RSYSCALL(). This avoids the need to #ifdef _THREAD_SAFE everywhere
* that the renamed function needs to be called.
*/
#ifdef _THREAD_SAFE
/*
* For the thread_safe versions, we prepend _thread_sys_ to the function
* name so that the 'C' wrapper can go around the real name.
*/
#define PCALL(name) \
CALL(___CONCAT(_thread_sys_,name))
#define PLEAF(name, args) \
LEAF(___CONCAT(_thread_sys_,name),args)
#define PEND(name) \
END(___CONCAT(_thread_sys_,name))
#define PSYSCALL(name) \
PLEAF(name,0); /* XXX # of args? */ \
CALLSYS_ERROR(name)
#define PRSYSCALL(name) \
PLEAF(name,0); /* XXX # of args? */ \
CALLSYS_ERROR(name) \
RET; \
PEND(name)
#define PPSEUDO(label,name) \
PLEAF(label,0); /* XXX # of args? */ \
CALLSYS_ERROR(name); \
RET; \
PEND(label)
#else
/*
* The non-threaded library defaults to traditional syscalls where
* the function name matches the syscall name.
*/
#define PSYSCALL(x) SYSCALL(x)
#define PRSYSCALL(x) RSYSCALL(x)
#define PPSEUDO(x,y) PSEUDO(x,y)
#define PLEAF(x,y) LEAF(x,y)
#define PEND(x) END(x)
#define PCALL(x) CALL(x)
#endif