1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 AT&T Intellectual Property * 5* and is licensed under the * 6* Common Public License, Version 1.0 * 7* by AT&T Intellectual Property * 8* * 9* A copy of the License is available at * 10* http://www.opensource.org/licenses/cpl1.0.txt * 11* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12* * 13* Information and Software Systems Research * 14* AT&T Research * 15* Florham Park NJ * 16* * 17* Glenn Fowler <gsf@research.att.com> * 18* David Korn <dgk@research.att.com> * 19* Phong Vo <kpv@research.att.com> * 20* * 21***********************************************************************/ 22#pragma prototyped 23 24#include <ast.h> 25 26#if _lib_rename 27 28NoN(rename) 29 30#else 31 32#include <error.h> 33#include <proc.h> 34 35#ifdef EPERM 36 37static int 38mvdir(const char* from, const char* to) 39{ 40 char* argv[4]; 41 int oerrno; 42 43 static const char mvdir[] = "/usr/lib/mv_dir"; 44 45 oerrno = errno; 46 if (!eaccess(mvdir, X_OK)) 47 { 48 argv[0] = mvdir; 49 argv[1] = from; 50 argv[2] = to; 51 argv[3] = 0; 52 if (!procrun(argv[0], argv, 0)) 53 { 54 errno = oerrno; 55 return 0; 56 } 57 } 58 errno = EPERM; 59 return -1; 60} 61 62#endif 63 64int 65rename(const char* from, const char* to) 66{ 67 int oerrno; 68 int ooerrno; 69 70 ooerrno = errno; 71 while (link(from, to)) 72 { 73#ifdef EPERM 74 if (errno == EPERM) 75 { 76 errno = ooerrno; 77 return mvdir(from, to); 78 } 79#endif 80 oerrno = errno; 81 if (unlink(to)) 82 { 83#ifdef EPERM 84 if (errno == EPERM) 85 { 86 errno = ooerrno; 87 return mvdir(from, to); 88 } 89#endif 90 errno = oerrno; 91 return -1; 92 } 93 } 94 errno = ooerrno; 95 return unlink(from); 96} 97 98#endif 99