1 /* $NetBSD: sane_rename.c,v 1.1.1.1 2009/06/23 10:09:00 tron Exp $ */ 2 3 /*++ 4 /* NAME 5 /* sane_rename 3 6 /* SUMMARY 7 /* sanitize rename() error returns 8 /* SYNOPSIS 9 /* #include <sane_fsops.h> 10 /* 11 /* int sane_rename(old, new) 12 /* const char *from; 13 /* const char *to; 14 /* DESCRIPTION 15 /* sane_rename() implements the rename(2) system call, and works 16 /* around some errors that are possible with NFS file systems. 17 /* LICENSE 18 /* .ad 19 /* .fi 20 /* The Secure Mailer license must be distributed with this software. 21 /* AUTHOR(S) 22 /* Wietse Venema 23 /* IBM T.J. Watson Research 24 /* P.O. Box 704 25 /* Yorktown Heights, NY 10598, USA 26 /*--*/ 27 28 /* System library. */ 29 30 #include "sys_defs.h" 31 #include <sys/stat.h> 32 #include <errno.h> 33 #include <stdio.h> /* rename(2) syscall in stdio.h? */ 34 35 /* Utility library. */ 36 37 #include "msg.h" 38 #include "sane_fsops.h" 39 40 /* sane_rename - sanitize rename() error returns */ 41 42 int sane_rename(const char *from, const char *to) 43 { 44 const char *myname = "sane_rename"; 45 int saved_errno; 46 struct stat st; 47 48 /* 49 * Normal case: rename() succeeds. 50 */ 51 if (rename(from, to) >= 0) 52 return (0); 53 54 /* 55 * Woops. Save errno, and see if the error is an NFS artefact. If it is, 56 * pretend the error never happened. 57 */ 58 saved_errno = errno; 59 if (stat(from, &st) < 0 && stat(to, &st) >= 0) { 60 msg_info("%s(%s,%s): worked around spurious NFS error", 61 myname, from, to); 62 return (0); 63 } 64 65 /* 66 * Nope, it didn't. Restore errno and report the error. 67 */ 68 errno = saved_errno; 69 return (-1); 70 } 71