blob: f0791489c77186aa02e95777ce436d86ca4a8054 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/param.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <sys/sysmacros.h>
#include <string.h> /* memset, strerror */
#include "file_lock.h"
#ifndef EFSEXCLWR
#define EFSEXCLWR 503
#endif
/*
* String containing the last system call.
*
*/
char Fl_syscall_str[128];
static char errmsg[256];
/***********************************************************************
*
* Test interface to the fcntl system call.
* It will loop if the LOCK_NB flags is NOT set.
***********************************************************************/
int
file_lock(fd, flags, errormsg)
int fd;
int flags;
char **errormsg;
{
register int cmd, ret;
struct flock flocks;
memset(&flocks, 0, sizeof(struct flock));
if (flags&LOCK_NB)
cmd = F_SETLK;
else
cmd = F_SETLKW;
flocks.l_whence = 0;
flocks.l_start = 0;
flocks.l_len = 0;
if (flags&LOCK_UN)
flocks.l_type = F_UNLCK;
else if (flags&LOCK_EX)
flocks.l_type = F_WRLCK;
else if (flags&LOCK_SH)
flocks.l_type = F_RDLCK;
else {
errno = EINVAL;
if ( errormsg != NULL ) {
sprintf(errmsg,
"Programmer error, called file_lock with in valid flags\n");
*errormsg = errmsg;
}
return -1;
}
sprintf(Fl_syscall_str,
"fcntl(%d, %d, &flocks): type:%d whence:%d, start:%lld len:%lld\n",
fd, cmd, flocks.l_type, flocks.l_whence,
(long long)flocks.l_start, (long long)flocks.l_len);
while (1) {
ret = fcntl(fd, cmd, &flocks);
if ( ret < 0 ) {
if ( cmd == F_SETLK )
switch (errno) {
/* these errors are okay */
case EACCES: /* Permission denied */
case EINTR: /* interrupted system call */
#ifdef EFILESH
case EFILESH: /* file shared */
#endif
case EFSEXCLWR: /* File is write protected */
continue; /* retry getting lock */
}
if ( errormsg != NULL ) {
sprintf(errmsg, "fcntl(%d, %d, &flocks): errno:%d %s\n",
fd, cmd, errno, strerror(errno));
*errormsg = errmsg;
}
return -1;
}
break;
}
return ret;
} /* end of file_lock */
/***********************************************************************
*
* Test interface to the fcntl system call.
* It will loop if the LOCK_NB flags is NOT set.
***********************************************************************/
int
record_lock(fd, flags, start, len, errormsg)
int fd;
int flags;
int start;
int len;
char **errormsg;
{
register int cmd, ret;
struct flock flocks;
memset(&flocks, 0, sizeof(struct flock));
if (flags&LOCK_NB)
cmd = F_SETLK;
else
cmd = F_SETLKW;
flocks.l_whence = 0;
flocks.l_start = start;
flocks.l_len = len;
if (flags&LOCK_UN)
flocks.l_type = F_UNLCK;
else if (flags&LOCK_EX)
flocks.l_type = F_WRLCK;
else if (flags&LOCK_SH)
flocks.l_type = F_RDLCK;
else {
errno = EINVAL;
if ( errormsg != NULL ) {
sprintf(errmsg,
"Programmer error, called record_lock with in valid flags\n");
*errormsg = errmsg;
}
return -1;
}
sprintf(Fl_syscall_str,
"fcntl(%d, %d, &flocks): type:%d whence:%d, start:%lld len:%lld\n",
fd, cmd, flocks.l_type, flocks.l_whence,
(long long)flocks.l_start, (long long)flocks.l_len);
while (1) {
ret = fcntl(fd, cmd, &flocks);
if ( ret < 0 ) {
if ( cmd == F_SETLK )
switch (errno) {
/* these errors are okay */
case EACCES: /* Permission denied */
case EINTR: /* interrupted system call */
#ifdef EFILESH
case EFILESH: /* file shared */
#endif
case EFSEXCLWR: /* File is write protected */
continue; /* retry getting lock */
}
if ( errormsg != NULL ) {
sprintf(errmsg, "fcntl(%d, %d, &flocks): errno:%d %s\n",
fd, cmd, errno, strerror(errno));
*errormsg = errmsg;
}
return -1;
}
break;
}
return ret;
} /* end of record_lock */