I think you have pretty much figured this out. Although I guess, you want authoritative answer. It is true that the documentation does not mention “rw+”. Yet, there is something better: PHP source code! The Rabbit Hole I had a hard time trying to navigate the source code until I found the article series PHP’s … Read more
I would recommend looking at David Beazley’s Generator Tricks for Python, especially Part 5: Processing Infinite Data. It will handle the Python equivalent of a tail -f logfile command in real-time. # follow.py # # Follow a file like tail -f. import time def follow(thefile): thefile.seek(0,2) while True: line = thefile.readline() if not line: time.sleep(0.1) … Read more
It looks like Microsoft has deprecated lots of calls which use buffers to improve code security. However, the solutions they’re providing aren’t portable. Anyway, if you aren’t interested in using the secure version of their calls (like fopen_s), you need to place a definition of _CRT_SECURE_NO_DEPRECATE before your included header files. For example: #define _CRT_SECURE_NO_DEPRECATE … Read more
As long as your program is running, if you keep opening files without closing them, the most likely result is that you will run out of file descriptors/handles available for your process, and attempting to open more files will fail eventually. On Windows, this can also prevent other processes from opening or deleting the files … Read more
Both r+ and w+ can read and write to a file. However, r+ doesn’t delete the content of the file and doesn’t create a new file if such file doesn’t exist, whereas w+ deletes the content of the file and creates it if it doesn’t exist.
Replace ‘\n’ with “\n”. The escape sequence is not recognized when you use ‘. See the manual. For the question of how to write line endings, see the note here. Basically, different operating systems have different conventions for line endings. Windows uses “\r\n”, unix based operating systems use “\n”. You should stick to one convention … Read more
There are many reasons why one might run into this error and thus a good checklist of what to check first helps considerably. Let’s consider that we are troubleshooting the following line: require “/path/to/file” Checklist 1. Check the file path for typos either check manually (by visually checking the path) or move whatever is called … Read more
First, there is no particularly good reason to use fdopen if fopen is an option and open is the other possible choice. You shouldn’t have used open to open the file in the first place if you want a FILE *. So including fdopen in that list is incorrect and confusing because it isn’t very … Read more