39d58e2f49
ported software:
* If the macro B_USE_POSITIVE_POSIX_ERRORS is defined the POSIX error code
constants (ENOMEM, EINTR,...) will have positive values.
* Introduced the macros B_TO_{POSITIVE,NEGATIVE}_ERROR() which do convert a
given error code to a positive/negative value.
* Added static library libposix_error_mapper.a that overrides all POSIX
functions (save the ones I forgot to add :-)) directly meddling with error
codes (having them as parameter or returning them) dealing with the
positive<->negative error code conversions. The functions have hidden
visibility, so they affect only the shared object they are linked into.
* So ideally all one has to do is to build a ported software with
-DB_USE_POSITIVE_POSIX_ERRORS and -lposix_error_mapper and be good with
respect to error code problems.
* Potential issues:
- When mixing ported and Haiku native code, i.e. using Haiku native code in
a ported software or using a ported library in a Haiku native application
care must be taken to convert error codes where the two interface. That's
what the B_TO_{POSITIVE,NEGATIVE}_ERROR() macros are supposed to be used
for.
- A ported static library can obviously not be linked directly against
-lposix_error_mapper. The shared object linking a against the ported static
library has to do that. The previous point applies when that causes mixing
with Haiku native code.
- When dependent ported libraries are used probably all of them should use
the error mapping.
Comments welcome.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29653 a95241bf-73f2-0310-859d-f6bbb57e9c96
47 lines
820 B
C
47 lines
820 B
C
/*
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** Copyright 2003-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
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** Distributed under the terms of the MIT License.
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*/
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/* Provides user space storage for "errno", located in TLS
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*/
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#include <errno.h>
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#include "support/TLS.h"
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#include "tls.h"
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int *
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_errnop(void)
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{
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return (int *)tls_address(TLS_ERRNO_SLOT);
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}
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// This is part of the Linuxbase binary specification
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// and is referenced by some code in libgcc.a.
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// ToDo: maybe we even want to include this always
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#ifdef __linux__
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extern int *(*__errno_location)(void) __attribute__ ((weak, alias("_errnop")));
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#endif
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// #pragma mark -
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int
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_to_positive_error(int error)
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{
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if (error < 0)
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return error == B_NO_MEMORY ? B_POSIX_ENOMEM : -error;
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return error;
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}
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int
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_to_negative_error(int error)
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{
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return error > 0 ? -error : error;
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}
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