04-10-2010
I hope you are aware that file locking doesn't prevent any process from doing anything - apart from setting a conflicting lock of course - if you didn't explicitly request mandatory locking.
The default is advisory locking, which expects processes to check for and honor locks voluntarily.
Mandatory locking is frowned upon on systems that have it (System V derivatives) and difficult (Linux) or impossible (BSD derivatives) to enable on others.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I need to write a function that will work in sh/ksh shell that will test to see if a file has already been opened for writting by another user
has anyone written something like this? (3 Replies)
Discussion started by: johnsonbryce
3 Replies
2. Programming
How should I use errno in a c program and what info does it have .
I am working with directories and files.
So can any one tell me How to access errno?I am using the stat() function on \etc directory and I am alble to access only the half of the directories.I am not able to access other half and... (6 Replies)
Discussion started by: vijlak
6 Replies
3. Programming
From reading various articles on the net, I know stat() is used on files to get things like permissions, sizes etc... As a folder is a special type of file in Unix, I assumed that stat() could work on it as well as any general file.
However, from running my program, perror() reported that the... (3 Replies)
Discussion started by: JamesGoh
3 Replies
4. UNIX and Linux Applications
To begin:
I use Linux
The Problem:
I need bcp functionality for scripts. Perl modules, such as Sybase:xfer, require ctlib which comes with Sybase Open Client. Talking with Sybase sales
reps is an exercise in futility and hate. They know absolutely nothing about their own products and will... (0 Replies)
Discussion started by: Bubnoff
0 Replies
5. Programming
Hello All,
i am porting my application from SunSolaris to Linux (RHEL4).
When i compile my c/c++ code i am getting the following errors.
1. catastrophic error: could not open source file "sys/elf_386.h"
#include <sys/elf_386.h>
2. catastrophic error: could not open source file... (2 Replies)
Discussion started by: tsaravanan
2 Replies
6. Shell Programming and Scripting
Help Please perl Gurus,
I am trying to add ungrouped passengers in a group and I creating a script however it fails on first step only I tried all the options it returns following error.
syntax error at junki line 4, near "open "
Execution of junki aborted due to compilation errors. ... (2 Replies)
Discussion started by: dynamax
2 Replies
7. Shell Programming and Scripting
Die to what all operations, the "Modify" and "Change" values of stat output changes for a file.
I found, during editing a file, Change and Modify alters. When chmod'ing Change alters, while Modify doesnot alters. Is there more situations where these changes? (1 Reply)
Discussion started by: anil510
1 Replies
8. Programming
I am opening a text file using open() system call in O_RDONLY mode.
open() returns me a valid handler but also sets errno to 13 i.e. EACCES(Permission denied).
Question is when open() is returning a valid handler then why does it sets the errno?
Should not errno be set only in case of error... (10 Replies)
Discussion started by: rupeshkp728
10 Replies
9. Shell Programming and Scripting
Hello all, just a quick little part of code i'm writing to check if the file i'm writing too in my automatic process is not being written too manually.
#!/bin/bash
FUSER=$(/sbin/fuser -s /toto.tmp >/dev/null 2>&1)
LSOF=$(/usr/sbin/lsof | grep -q "toto.tmp")
PGREP=$(pgrep -f "toto.tmp" >... (6 Replies)
Discussion started by: maverick72
6 Replies
10. Programming
(Apologies for any typos.)
OSX 10.12.3 AND Windows 10.
This is for the serious Python experts on at least 3.5.x and above...
In script format sys.stdout.write() AND sys.stderr.write() seems to work correctly.
Have I found a serious bug in the interactive sys.stdout.write() AND... (2 Replies)
Discussion started by: wisecracker
2 Replies
CREAT(3P) POSIX Programmer's Manual CREAT(3P)
PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME
creat - create a new file or rewrite an existing one
SYNOPSIS
#include <sys/stat.h>
#include <fcntl.h>
int creat(const char *path, mode_t mode);
DESCRIPTION
The function call:
creat(path, mode)
shall be equivalent to:
open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)
RETURN VALUE
Refer to open().
ERRORS
Refer to open().
The following sections are informative.
EXAMPLES
Creating a File
The following example creates the file /tmp/file with read and write permissions for the file owner and read permission for group and oth-
ers. The resulting file descriptor is assigned to the fd variable.
#include <fcntl.h>
...
int fd;
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
char *filename = "/tmp/file";
...
fd = creat(filename, mode);
...
APPLICATION USAGE
None.
RATIONALE
The creat() function is redundant. Its services are also provided by the open() function. It has been included primarily for historical
purposes since many existing applications depend on it. It is best considered a part of the C binding rather than a function that should be
provided in other languages.
FUTURE DIRECTIONS
None.
SEE ALSO
open(), the Base Definitions volume of IEEE Std 1003.1-2001, <fcntl.h>, <sys/stat.h>, <sys/types.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE
/The Open Group 2003 CREAT(3P)