1 /* rename.c -- BSD compatible directory function for System V 2 Copyright (C) 1988, 1990 Free Software Foundation, Inc. 3 4 This program is free software; you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 2, or (at your option) 7 any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software 16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ 17 18 #ifdef HAVE_CONFIG_H 19 #include "config.h" 20 #endif 21 22 #include <sys/types.h> 23 #include <sys/stat.h> 24 #include <errno.h> 25 #ifndef STDC_HEADERS 26 extern int errno; 27 #endif 28 29 /* Rename file FROM to file TO. 30 Return 0 if successful, -1 if not. */ 31 32 int 33 rename (from, to) 34 char *from; 35 char *to; 36 { 37 struct stat from_stats; 38 int pid, status; 39 40 if (stat (from, &from_stats) == 0) 41 { 42 /* We don't check existence_error because the systems which need it 43 have rename(). */ 44 if (unlink (to) && errno != ENOENT) 45 return -1; 46 if ((from_stats.st_mode & S_IFMT) == S_IFDIR) 47 { 48 #ifdef MVDIR 49 /* I don't think MVDIR ever gets defined, but I don't think 50 it matters, because I don't think CVS ever calls rename() 51 on directories. */ 52 53 /* Need a setuid root process to link and unlink directories. */ 54 pid = fork (); 55 switch (pid) 56 { 57 case -1: /* Error. */ 58 error (1, errno, "cannot fork"); 59 60 case 0: /* Child. */ 61 execl (MVDIR, "mvdir", from, to, (char *) 0); 62 error (255, errno, "cannot run `%s'", MVDIR); 63 64 default: /* Parent. */ 65 while (wait (&status) != pid) 66 /* Do nothing. */ ; 67 68 errno = 0; /* mvdir printed the system error message. */ 69 return status != 0 ? -1 : 0; 70 } 71 #else /* no MVDIR */ 72 error (1, 0, "internal error: cannot move directories"); 73 #endif /* no MVDIR */ 74 } 75 else 76 { 77 /* We don't check existence_error because the systems which need it 78 have rename(). */ 79 if (link (from, to) == 0 && (unlink (from) == 0 || errno == ENOENT)) 80 return 0; 81 } 82 } 83 return -1; 84 } 85