1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 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 28 NoN(rename) 29 30 #else 31 32 #include <error.h> 33 #include <proc.h> 34 35 #ifdef EPERM 36 37 static int 38 mvdir(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)) 53 { 54 errno = oerrno; 55 return 0; 56 } 57 } 58 errno = EPERM; 59 return -1; 60 } 61 62 #endif 63 64 int 65 rename(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