symlink.c revision 3f54fd611f536639ec30dd53c48e5ec1897cc7d9
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2012 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
#include <ast.h>
#if _lib_symlink
NoN(symlink)
#else
#include "fakelink.h"
#include <error.h>
#ifndef ENOSYS
#define ENOSYS EINVAL
#endif
int
symlink(const char* a, char* b)
{
if (*a == '/' && (*(a + 1) == 'd' || *(a + 1) == 'p' || *(a + 1) == 'n') && (!strncmp(a, "/dev/tcp/", 9) || !strncmp(a, "/dev/udp/", 9) || !strncmp(a, "/proc/", 6) || !strncmp(a, "/n/", 3)))
{
int n;
int fd;
if ((fd = open(b, O_CREAT|O_TRUNC|O_WRONLY|O_cloexec, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) < 0)
return -1;
n = strlen(a) + 1;
n = (write(fd, FAKELINK_MAGIC, sizeof(FAKELINK_MAGIC)) != sizeof(FAKELINK_MAGIC) || write(fd, a, n) != n) ? -1 : 0;
close(fd);
return n;
}
errno = ENOSYS;
return -1;
}
#endif