287b96dd25
Add two new functions, sysdecode_abi_to_freebsd_errno() and sysdecode_freebsd_to_abi_errno(), which convert errno values between the native FreeBSD ABI and other supported ABIs. Note that the mappings are not necessarily perfect meaning in some cases multiple errors in one ABI might map to a single error in another ABI. In that case, the reverse mapping will return one of the errors that maps, but which error is non-deterministic. Change truss to always report the raw error value to the user but use libsysdecode to map it to a native errno value that can be used with strerror() to generate a description. Previously truss reported the "converted" error value. Now the user will always see the exact error value that the application sees. Change kdump to report the truly raw error value to the user. Previously kdump would report the absolute value of the raw error value (so for Linux binaries it didn't output the FreeBSD error value, but the positive value of the Linux error). Now it reports the real (i.e. negative) error value for Linux binaries. Also, use libsysdecode to convert the native FreeBSD error reported in the ktrace record to the raw error used by the ABI. This means that the Linux ABI can now be handled directly in ktrsysret() and removes the need for linux_ktrsysret(). Reviewed by: bdrewery, kib Helpful notes: wblock (manpage) Differential Revision: https://reviews.freebsd.org/D5314
76 lines
2.5 KiB
Groff
76 lines
2.5 KiB
Groff
.\"
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.\" Copyright (c) 2015 John Baldwin <jhb@FreeBSD.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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 29, 2016
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.Dt SYSDECODE 3
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.Os
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.Sh NAME
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.Nm sysdecode
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.Nd system argument decoding library
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.Sh LIBRARY
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.Lb libsysdecode
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.Sh DESCRIPTION
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The
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.Nm
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library includes several functions that provide descriptive names of
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values associated with system calls.
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.Ss Supported ABIs
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Some functions in this library provide ABI-specific descriptions.
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The supported ABIs are named by the
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.Vt enum sysdecode_abi
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enumeration.
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.Pp
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.Bl -tag -width "Li SYSDECODE_ABI_CLOUDABI64" -compact
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.It Li SYSDECODE_ABI_FREEBSD
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Native FreeBSD binaries.
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Supported on all platforms.
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.It Li SYSDECODE_ABI_FREEBSD32
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32-bit FreeBSD binaries.
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Supported on amd64 and powerpc64.
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.It Li SYSDECODE_ABI_LINUX
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Linux binaries of the same platform.
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Supported on amd64 and i386.
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.It Li SYSDECODE_ABI_LINUX32
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32-bit Linux binaries.
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Supported on amd64.
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.It Li SYSDECODE_ABI_CLOUDABI64
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64-bit CloudABI binaries.
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Supported on aarch64 and amd64.
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.It Li SYSDECODE_ABI_UNKNOWN
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A placeholder for use when the ABI is not known.
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.El
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.Sh SEE ALSO
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.Xr sysdecode_abi_to_freebsd_errno 3 ,
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.Xr sysdecode_ioctlname 3 ,
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.Xr sysdecode_syscallnames 3 ,
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.Xr sysdecode_utrace 3
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.Sh HISTORY
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The
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.Nm
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library first appeared in
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.Fx 11.0 .
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