1*4887Schin /*********************************************************************** 2*4887Schin * * 3*4887Schin * This software is part of the ast package * 4*4887Schin * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5*4887Schin * and is licensed under the * 6*4887Schin * Common Public License, Version 1.0 * 7*4887Schin * by AT&T Knowledge Ventures * 8*4887Schin * * 9*4887Schin * A copy of the License is available at * 10*4887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 11*4887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12*4887Schin * * 13*4887Schin * Information and Software Systems Research * 14*4887Schin * AT&T Research * 15*4887Schin * Florham Park NJ * 16*4887Schin * * 17*4887Schin * Glenn Fowler <gsf@research.att.com> * 18*4887Schin * David Korn <dgk@research.att.com> * 19*4887Schin * Phong Vo <kpv@research.att.com> * 20*4887Schin * * 21*4887Schin ***********************************************************************/ 22*4887Schin #pragma prototyped 23*4887Schin 24*4887Schin #include <ast.h> 25*4887Schin 26*4887Schin #if _lib_readlink 27*4887Schin 28*4887Schin NoN(readlink) 29*4887Schin 30*4887Schin #else 31*4887Schin 32*4887Schin #include "fakelink.h" 33*4887Schin 34*4887Schin #include <error.h> 35*4887Schin 36*4887Schin #ifndef ENOSYS 37*4887Schin #define ENOSYS EINVAL 38*4887Schin #endif 39*4887Schin 40*4887Schin int 41*4887Schin readlink(const char* path, char* buf, int siz) 42*4887Schin { 43*4887Schin int fd; 44*4887Schin int n; 45*4887Schin 46*4887Schin if (siz > sizeof(FAKELINK_MAGIC)) 47*4887Schin { 48*4887Schin if ((fd = open(path, O_RDONLY)) < 0) 49*4887Schin return -1; 50*4887Schin if (read(fd, buf, sizeof(FAKELINK_MAGIC)) == sizeof(FAKELINK_MAGIC) && !strcmp(buf, FAKELINK_MAGIC) && (n = read(fd, buf, siz)) > 0 && !buf[n - 1]) 51*4887Schin { 52*4887Schin close(fd); 53*4887Schin return n; 54*4887Schin } 55*4887Schin close(fd); 56*4887Schin } 57*4887Schin errno = ENOSYS; 58*4887Schin return -1; 59*4887Schin } 60*4887Schin 61*4887Schin #endif 62