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 #ifdef HAVE_CONFIG_H 15 #include "config.h" 16 #endif 17 18 #include <sys/types.h> 19 #include <sys/stat.h> 20 #include <errno.h> 21 #ifndef STDC_HEADERS 22 extern int errno; 23 #endif 24 25 /* Rename file FROM to file TO. 26 Return 0 if successful, -1 if not. */ 27 28 int 29 rename (from, to) 30 char *from; 31 char *to; 32 { 33 struct stat from_stats; 34 int pid, status; 35 36 if (stat (from, &from_stats) == 0) 37 { 38 /* We don't check existence_error because the systems which need it 39 have rename(). */ 40 if (CVS_UNLINK (to) && errno != ENOENT) 41 return -1; 42 if ((from_stats.st_mode & S_IFMT) == S_IFDIR) 43 { 44 #ifdef MVDIR 45 /* I don't think MVDIR ever gets defined, but I don't think 46 it matters, because I don't think CVS ever calls rename() 47 on directories. */ 48 49 /* Need a setuid root process to link and unlink directories. */ 50 pid = fork (); 51 switch (pid) 52 { 53 case -1: /* Error. */ 54 error (1, errno, "cannot fork"); 55 56 case 0: /* Child. */ 57 execl (MVDIR, "mvdir", from, to, (char *) 0); 58 error (255, errno, "cannot run `%s'", MVDIR); 59 60 default: /* Parent. */ 61 while (wait (&status) != pid) 62 /* Do nothing. */ ; 63 64 errno = 0; /* mvdir printed the system error message. */ 65 return status != 0 ? -1 : 0; 66 } 67 #else /* no MVDIR */ 68 error (1, 0, "internal error: cannot move directories"); 69 #endif /* no MVDIR */ 70 } 71 else 72 { 73 /* We don't check existence_error because the systems which need it 74 have rename(). */ 75 if (link (from, to) == 0 && (CVS_UNLINK (from) == 0 || errno == ENOENT)) 76 return 0; 77 } 78 } 79 return -1; 80 } 81