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76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
/* Copyright (C) 1991-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdeps/generic/sysdep.h>
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#include <sys/syscall.h>
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#define HAVE_SYSCALLS
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/* Note that using a `PASTE' macro loses. */
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#define SYSCALL__(name, args) PSEUDO (__##name, name, args)
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#define SYSCALL(name, args) PSEUDO (name, name, args)
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/* Cancellation macros. */
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#define __SYSCALL_NARGS_X(a,b,c,d,e,f,g,n,...) n
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#define __SYSCALL_NARGS(...) \
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__SYSCALL_NARGS_X (__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0,)
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#define SYSCALL_CANCEL(name, ...) \
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({ \
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long int sc_ret; \
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if (SINGLE_THREAD_P) \
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sc_ret = INLINE_SYSCALL (name, __SYSCALL_NARGS(__VA_ARGS__), \
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__VA_ARGS__); \
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else \
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{ \
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int sc_cancel_oldtype = LIBC_CANCEL_ASYNC (); \
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sc_ret = INLINE_SYSCALL (name, __SYSCALL_NARGS (__VA_ARGS__), \
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__VA_ARGS__); \
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LIBC_CANCEL_RESET (sc_cancel_oldtype); \
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} \
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sc_ret; \
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})
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/* Machine-dependent sysdep.h files are expected to define the macro
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PSEUDO (function_name, syscall_name) to emit assembly code to define the
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C-callable function FUNCTION_NAME to do system call SYSCALL_NAME.
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r0 and r1 are the system call outputs. MOVE(x, y) should be defined as
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an instruction such that "MOVE(r1, r0)" works. ret should be defined
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as the return instruction. */
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#ifndef SYS_ify
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#define SYS_ify(syscall_name) SYS_##syscall_name
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#endif
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/* Terminate a system call named SYM. This is used on some platforms
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to generate correct debugging information. */
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#ifndef PSEUDO_END
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#define PSEUDO_END(sym)
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#endif
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#ifndef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(sym) PSEUDO_END(sym)
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#endif
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#ifndef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(sym) PSEUDO_END(sym)
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#endif
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/* Wrappers around system calls should normally inline the system call code.
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But sometimes it is not possible or implemented and we use this code. */
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#ifndef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) __syscall_##name (args)
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#endif
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