1*b30d1939SAndy Fiddaman /*********************************************************************** 2*b30d1939SAndy Fiddaman * * 3*b30d1939SAndy Fiddaman * This software is part of the ast package * 4*b30d1939SAndy Fiddaman * Copyright (c) 1985-2012 AT&T Intellectual Property * 5*b30d1939SAndy Fiddaman * and is licensed under the * 6*b30d1939SAndy Fiddaman * Eclipse Public License, Version 1.0 * 7*b30d1939SAndy Fiddaman * by AT&T Intellectual Property * 8*b30d1939SAndy Fiddaman * * 9*b30d1939SAndy Fiddaman * A copy of the License is available at * 10*b30d1939SAndy Fiddaman * http://www.eclipse.org/org/documents/epl-v10.html * 11*b30d1939SAndy Fiddaman * (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12*b30d1939SAndy Fiddaman * * 13*b30d1939SAndy Fiddaman * Information and Software Systems Research * 14*b30d1939SAndy Fiddaman * AT&T Research * 15*b30d1939SAndy Fiddaman * Florham Park NJ * 16*b30d1939SAndy Fiddaman * * 17*b30d1939SAndy Fiddaman * Glenn Fowler <gsf@research.att.com> * 18*b30d1939SAndy Fiddaman * David Korn <dgk@research.att.com> * 19*b30d1939SAndy Fiddaman * Phong Vo <kpv@research.att.com> * 20*b30d1939SAndy Fiddaman * * 21*b30d1939SAndy Fiddaman ***********************************************************************/ 22*b30d1939SAndy Fiddaman #pragma prototyped 23*b30d1939SAndy Fiddaman 24*b30d1939SAndy Fiddaman #include <ast.h> 25*b30d1939SAndy Fiddaman 26*b30d1939SAndy Fiddaman #if _lib_readlink 27*b30d1939SAndy Fiddaman 28*b30d1939SAndy Fiddaman NoN(readlink) 29*b30d1939SAndy Fiddaman 30*b30d1939SAndy Fiddaman #else 31*b30d1939SAndy Fiddaman 32*b30d1939SAndy Fiddaman #include "fakelink.h" 33*b30d1939SAndy Fiddaman 34*b30d1939SAndy Fiddaman #include <error.h> 35*b30d1939SAndy Fiddaman 36*b30d1939SAndy Fiddaman #ifndef ENOSYS 37*b30d1939SAndy Fiddaman #define ENOSYS EINVAL 38*b30d1939SAndy Fiddaman #endif 39*b30d1939SAndy Fiddaman 40*b30d1939SAndy Fiddaman int 41*b30d1939SAndy Fiddaman readlink(const char* path, char* buf, int siz) 42*b30d1939SAndy Fiddaman { 43*b30d1939SAndy Fiddaman int fd; 44*b30d1939SAndy Fiddaman int n; 45*b30d1939SAndy Fiddaman 46*b30d1939SAndy Fiddaman if (siz > sizeof(FAKELINK_MAGIC)) 47*b30d1939SAndy Fiddaman { 48*b30d1939SAndy Fiddaman if ((fd = open(path, O_RDONLY|O_cloexec)) < 0) 49*b30d1939SAndy Fiddaman return -1; 50*b30d1939SAndy Fiddaman if (read(fd, buf, sizeof(FAKELINK_MAGIC)) == sizeof(FAKELINK_MAGIC) && !strcmp(buf, FAKELINK_MAGIC) && (n = read(fd, buf, siz)) > 0 && !buf[n - 1]) 51*b30d1939SAndy Fiddaman { 52*b30d1939SAndy Fiddaman close(fd); 53*b30d1939SAndy Fiddaman return n; 54*b30d1939SAndy Fiddaman } 55*b30d1939SAndy Fiddaman close(fd); 56*b30d1939SAndy Fiddaman } 57*b30d1939SAndy Fiddaman errno = ENOSYS; 58*b30d1939SAndy Fiddaman return -1; 59*b30d1939SAndy Fiddaman } 60*b30d1939SAndy Fiddaman 61*b30d1939SAndy Fiddaman #endif 62