82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
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/* @(#)linkat.c 1.4 16/08/10 Copyright 2011-2016 J. Schilling */
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/*
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* Emulate the behavior of linkat(int fd1, const char *name1, int fd2,
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* const char *name2, int flag)
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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) 2011-2016 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_LINKAT
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#ifndef ENAMETOOLONG
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#define ENAMETOOLONG EINVAL
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#endif
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EXPORT int linkfollow __PR((const char *old, const char *new));
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EXPORT int
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linkfollow(old, new)
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const char *old;
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const char *new;
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{
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char buf[max(8192, PATH_MAX+1)];
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int blen;
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buf[0] = '\0';
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if ((blen = resolvepath(old, buf, sizeof (buf))) < 0) {
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return (-1);
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} else if (blen >= sizeof (buf)) {
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seterrno(ENAMETOOLONG);
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return (-1); /* Path too long */
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} else {
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buf[blen] = '\0'; /* Solaris syscall does not null-terminate */
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}
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return (link(buf, new));
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}
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#define KR_DECL int flag;
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/* CSTYLED */
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#define KR_ARGS , flag
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#define FUNC_CALL(n1, n2) (flag & AT_SYMLINK_FOLLOW ? \
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linkfollow(n1, n2) : link(n1, n2))
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#define FLAG_CHECK() if (flag & ~(AT_SYMLINK_FOLLOW)) { \
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seterrno(EINVAL); \
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return (-1); \
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}
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#define FUNC_NAME linkat
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#define FUNC_RESULT int
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#include "at-base2.c"
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#endif /* HAVE_LINKAT */
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