fcntl refers to a function that provides control over the open file referenced by a file descriptor
fcntl refers to a function that provides control over the open file referenced by a file descriptor.
Questions tagged [fcntl]
234 questions
0
votes
2 answers
Not able to close the file open using popen
I'm new to C language and today, i am facing a problem while i am trying to close the "Open Stream" created by using the popen function.
1. Is this problem seeing, because of the poll function that i used in this program?
2. Or because of the…
Sougrakpam
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votes
1 answer
How to use "fcntl.lockf" in Python?
I found this question but I do not know how to use the suggestion. I have tried
with open(fullname) as filein:
fcntl.lockf(filein, fcntl.LOCK_EX | fcntl.LOCK_NB)
and
with open(fullname) as filein:
fcntl.lockf(filein.fileno(), fcntl.LOCK_EX…
Alex
- 41,580
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votes
1 answer
read() not working as expected. Returns value 1 on successful read of large block
I am developing a process that, among other things, will copy files. I've run across a problem that the read function does not work as I expected.
My research and my prior experience tell me that the (fcntl) read() function is supposed to return…
Dennis
- 1,071
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votes
1 answer
How can I open directory with open() function in C?
I want to open a directory without using .
I tried this:
#include
int fd = open("dir", O_RDONLY, 0);
But it returns fd = -1. Why? As I know, the directory is a file too, it just stores the location of children files and…
Abdul Axundzade
- 61
- 6
-1
votes
2 answers
Non-blocking pasv sock and blocking connection (active) socket
On my TCP server I would like to have:
non-blocking passive socket to have non-blocking accept();
after accepting connection I would like to perform some authentication like verifying client provided Id and Password. So I have well defined…
Michał Ziobro
- 10,759
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- 143
-1
votes
1 answer
Linux: Conflicts using inotify with fcntl
I'm having a strange linking issue after I included inotify in my program to monitor changes to a filesystem. The project includes in many other source files. However, when I include in the source file which is doing the…
Lars
- 233
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-3
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1 answer
Whether fcntl record lock can work in multithreads
I tried fcntl record lock work in multithreads on linux.
But it seems fcntl record lock doesn't work?
Can fcntl record lock work in multithreads?
yafeng
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- 1
-3
votes
1 answer
C: How to append data to a file without using standard I/O libraries
I was wondering if there is a way to append data to a file without using functions from standard I/O libraries (i.e. stdio.h). I though of doing something like this first:
#include
#include
int main() {
int fd =…
M.Ahmed
- 11
- 4
-4
votes
1 answer
segmentation err in switch case
I wrote a code to implement file locking in c. After resolving a errors and ignoring all the warnings haha, I was able to compile the code but now the thing is, When I try to add content to the file, it is showing segmentation error. code…
