72aba2be32
Move is_negated_errno() to a separate new header file negated_errno.h and include it just for architectures which require it. is_negated_errno() is not used on those architectures that have a dedicated register to signal a syscall error. The issue was raised when compiling with clang, which is more strict regarding semantics of unused static inline functions defined in C files and will issue a -Wunused-function warrning if they are not used anywhere. * syscall.c (is_negated_errno): Move to ... * negated_errno.h: ... new file. * Makefile.am (strace_SOURCES): Add it. * linux/aarch64/get_error.c: Include it. * linux/arc/get_error.c: Likewise. * linux/arm/get_error.c: Likewise. * linux/avr32/get_error.c: Likewise. * linux/bfin/get_error.c: Likewise. * linux/crisv10/get_error.c: Likewise. * linux/hppa/get_error.c: Likewise. * linux/i386/get_error.c: Likewise. * linux/ia64/get_error.c: Likewise. * linux/m68k/get_error.c: Likewise. * linux/metag/get_error.c: Likewise. * linux/microblaze/get_error.c: Likewise. * linux/or1k/get_error.c: Likewise. * linux/riscv/get_error.c: Likewise. * linux/s390/get_error.c: Likewise. * linux/sh/get_error.c: Likewise. * linux/sh64/get_error.c: Likewise. * linux/tile/get_error.c: Likewise. * linux/x86_64/get_error.c: Likewise. * linux/xtensa/get_error.c: Likewise.
52 lines
2.0 KiB
C
52 lines
2.0 KiB
C
/*
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* Copyright (c) 2015-2017 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef STRACE_NEGATED_ERRNO_H
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#define STRACE_NEGATED_ERRNO_H
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/*
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* Check the syscall return value register value for whether it is
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* a negated errno code indicating an error, or a success return value.
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*/
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static inline bool
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is_negated_errno(kernel_ulong_t val)
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{
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/* Linux kernel defines MAX_ERRNO to 4095. */
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kernel_ulong_t max = -(kernel_long_t) 4095;
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#ifndef current_klongsize
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if (current_klongsize < sizeof(val)) {
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val = (uint32_t) val;
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max = (uint32_t) max;
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}
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#endif /* !current_klongsize */
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return val >= max;
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}
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#endif /* !STRACE_NEGATED_ERRNO_H */
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