72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
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/* @(#)readlinkat.c 1.2 13/10/30 Copyright 2013 J. Schilling */
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/*
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* Emulate the behavior of readlinkat(int fd, const char *name, char *lbuf, size_t lbufsize)
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*
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* Note that emulation methods that do not use the /proc filesystem are
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* not MT safe. In the non-MT-safe case, we do:
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*
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* savewd()/fchdir()/open(name)/restorewd()
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*
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* Errors may force us to abort the program as our caller is not expected
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* to know that we do more than a simple open() here and that the
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* working directory may be changed by us.
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*
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* Copyright (c) 2013 J. Schilling
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*/
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/*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* See the file CDDL.Schily.txt in this distribution for details.
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* A copy of the CDDL is also available via the Internet at
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* http://www.opensource.org/licenses/cddl1.txt
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file CDDL.Schily.txt from this distribution.
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*/
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#include <schily/unistd.h>
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#include <schily/types.h>
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#include <schily/fcntl.h>
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#include <schily/maxpath.h>
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#include <schily/errno.h>
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#include <schily/standard.h>
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#include <schily/schily.h>
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#include "at-defs.h"
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#ifndef HAVE_READLINKAT
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#ifndef HAVE_READLINK
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/* ARGSUSED */
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EXPORT ssize_t
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readlinkat(fd, name, lbuf, lbufsize)
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int fd;
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const char *name;
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char *lbuf;
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size_t lbufsize;
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{
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#ifdef ENOSYS
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seterrno(ENOSYS);
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#else
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seterrno(EINVAL);
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#endif
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return (-1);
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}
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#else
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/* CSTYLED */
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#define PROTO_DECL , char *lbuf, size_t lbufsize
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#define KR_DECL char *lbuf; size_t lbufsize;
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/* CSTYLED */
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#define KR_ARGS , lbuf, lbufsize
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#define FUNC_CALL(n) readlink(n, lbuf, lbufsize)
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#define FLAG_CHECK()
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#define FUNC_NAME readlinkat
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#define FUNC_RESULT ssize_t
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#include "at-base.c"
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#endif /* HAVE_READLINK */
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#endif /* HAVE_READLINKAT */
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