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crx_nfs
crx_nfs
/*
* Program: Exclusive create of a file, NFS kludge version
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 17 December 1999
* Last Edited: 17 December 2001
*
* The IMAP toolkit provided in this Distribution is
* Copyright 2001 University of Washington.
* The full text of our legal notices is contained in the file called
* CPYRIGHT, included with this Distribution.
*/
/* SUN-OS had an NFS, As kludgy as an albatross;
* And everywhere that it was installed, It was a total loss.
* -- MRC 9/25/91
*/
/* Exclusive create of a file
* Accepts: file name
* Return: T if success, NIL if failed, -1 if retry
*/
long crexcl (char *name)
{
long ret = -1;
int i;
char hitch[MAILTMPLEN];
struct stat sb;
int mask = umask (0);
/* build hitching post file name */
sprintf (hitch,"%s.%lu.%d.",name,(unsigned long) time (0),getpid ());
i = strlen (hitch); /* append local host name */
gethostname (hitch + i,(MAILTMPLEN - i) - 1);
/* try to get hitching-post file */
if ((i = open (hitch,O_WRONLY|O_CREAT|O_EXCL,(int) lock_protection)) >= 0) {
close (i); /* close the hitching-post */
/* Note: link() may return an error even if it actually succeeded. So we
* always check for success via the link count, and ignore the error if
* the link count is right.
*/
/* tie hitching-post to lock */
i = link (hitch,name) ? errno : 0;
/* success if link count now 2 */
if (!stat (hitch,&sb) && (sb.st_nlink == 2)) ret = LONGT;
else if (i == EPERM) { /* links not allowed? */
/* Probably a FAT filesystem on Linux. It can't be NFS, so try creating
* the lock file directly.
*/
if ((i = open (name,O_WRONLY|O_CREAT|O_EXCL,(int)lock_protection)) >= 0){
close (i); /* close the file */
ret = LONGT; /* success */
}
/* fail unless error is EEXIST */
else if (errno != EEXIST) ret = NIL;
}
unlink (hitch); /* flush hitching post */
}
/* fail unless error is EEXIST */
else if (errno != EEXIST) ret = NIL;
umask (mask); /* restore previous mask */
return ret;
}
PHP PostgreSQL Hosting
/*
* Program: Operating-system dependent routines -- AIX/RT version
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 10 April 1992
* Last Edited: 10 April 2001
*
* The IMAP toolkit provided in this Distribution is
* Copyright 2001 University of Washington.
* The full text of our legal notices is contained in the file called
* CPYRIGHT, included with this Distribution.
*/
#include
#include
#include
#include
#define direct dirent
#include
#include
#include
#include
#include
/* Different names between BSD and SVR4 */
#define L_SET SEEK_SET
#define L_INCR SEEK_CUR
#define L_XTND SEEK_END
#define random lrand48
#define SIGSTOP SIGQUIT
/* For setitimer() emulation */
#define ITIMER_REAL 0
struct passwd *getpwent (void);
struct passwd *getpwuid (int uid);
struct passwd *getpwnam (char *name);
char *getenv (char *name);
long gethostid (void);
void *memmove (void *s,void *ct,size_t n);
char *strstr (char *cs,char *ct);
char *strerror (int n);
unsigned long strtoul (char *s,char **endp,int base);
typedef int (*select_t) (struct direct *name);
typedef int (*compar_t) (void *d1,void *d2);
int scandir (char *dirname,struct direct ***namelist,select_t select,
compar_t compar);
void *malloc (size_t byteSize);
void free (void *ptr);
void *realloc (void *oldptr,size_t newsize);
int openlog (ident,logopt,facility);
int syslog (priority,message,parameters ...);
#include "env_unix.h"
#include "fs.h"
#include "ftl.h"
#include "nl.h"
#include "tcp.h"
#include "flocksim.h"
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