Mmap.error Errno 13 Permission Denied
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Mmap Permission Denied Exploit
not working for me. What am I doing wrong? >>> import os,mmap >>> mfd = os.open('BigFile', 0) >>> mfile = mmap.mmap(mfd, 0) Traceback (most recent call last): File "
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Why does mmap() http://stackoverflow.com/questions/6286592/python-mmap-permission-denied-on-linux/6286646 fail with permission denied for the destination file of a file copy program? up vote 4 down vote favorite 1 I'd like to give a try at copying the contents of a file over to another one by using memory mapped I/O in Linux via mmap(). The intention is to check by myself if that's better than using fread() and fwrite() and how would it http://stackoverflow.com/questions/17202741/why-does-mmap-fail-with-permission-denied-for-the-destination-file-of-a-file-c deal with big files (like couple of GiBs for example, since the file is read whole I want to know if I need to have such amount of memory for it). This is the code I'm working with right now: // Open original file descriptor: int orig_fd = open(argv[1], O_RDONLY); // Check if it was really opened: if (orig_fd == -1) { fprintf(stderr, "ERROR: File %s couldn't be opened:\n", argv[1]); fprintf(stderr, "%d - %s\n", errno, strerror(errno)); exit(EX_NOINPUT); } // Idem for the destination file: int dest_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0644); // Check if it was really opened: if (dest_fd == -1) { fprintf(stderr, "ERROR: File %s couldn't be opened:\n", argv[2]); fprintf(stderr, "%d - %s\n", errno, strerror(errno)); // Close original file descriptor too: close(orig_fd); exit(EX_CANTCREAT); } // Acquire file size: struct stat info = {0}; if (fstat(orig_fd, &info)) { fprintf(stderr, "ERROR: Couldn't get info on %s:\n", argv[1]); fprintf(stderr, "%d - %s\n", errno, strerror(errno)); // Close file descriptors: close(orig_fd); close(dest_fd); exit(EX_IOERR); } // Set destination file size: if (ftruncate(dest_fd, info.st_size)) { fprintf(stderr, "ERROR: Unable to set %s file size:\n", argv[2]); fprintf(stderr, "%d - %s\n", errno, strerror(errno)); // Close file descriptors: cl
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>>> mfd = os.open('BigFile', 0)
>>> mfile = mmap.mmap(mfd, 0)
Traceback (most recent call last):
File "
mmap.error: [Errno 13] Permission denied
>>>
(using the built in open() works via the python docs example, but mmap.error errno 13 it seems to open more than one handle to the file both in read & write mode. All i need for the mmap.mmap method is the file number, so I wouldn't assume i need to create a file object; hence my attempt at using os.open()) Anonymous Answer Email {} Share I think its a flags issue, try opening as read only: mfd = os.open('BigFile', os.O_RDONLY) and mmap.mmap by default tries to map read/write, so just map read only: mfile = mmap.mmap(mfd, 0, prot=mmap.PROT_READ) Source (Stackoverflow) http://stackoverflow.com/questions/6286592/python-mmap-permission-denied-on-linux Comments Please enable JavaScript to view the comments powered by Disqus. × Email codedump link for Python mmap 'Permission denied' on Linux Email has been send. To emailaddress: To name: From name: Extra information in the email body (optional): Email: I am sending you the codedump of Python mmap 'Permission denied' on Linux that you can see here: https://codedump.io/share/W65GQafA3aTq/1 Close Send email Share Sign up Sign up with GitHub Email: Displayname Password: Repeat password: Tags python mmap permission-denied Latest added Twig display current year ReCAPTCHA In Laravel 5.2 Forms For Validation frame Popup-2 Popup © 2016 CodeDump |Terms Privacy Rss Api doc Sign in -Sign up For programmers by programmers Tag v2.0.1