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I saw a code snippet using fopen(file_name, "r+e"). What does the e flag mean in fopen? I couldn't find any information from the linux man page.
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The key difference between the fopen() and the open() function in the Linux operating system is that the open() function is a low-level call, where the fopen() when called simply calls the open() function in the background and it returns a Filepointer directly.
The open function is the underlying primitive for the fopen and freopen functions, that create streams. Preliminary: | MT-Safe | AS-Safe | AC-Safe fd | See POSIX Safety Concepts. This function is similar to open . It returns a file descriptor which can be used to access the file named by filename .
On a GNU webpage I found that the e means that the "file descriptor will be closed if you use any of the exec… functions".
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It's documented in the man page on my system (release 3.54 of the Linux man-pages project).
e (since glibc 2.7)
Open the file with theO_CLOEXECflag. Seeopen(2)for more information. This flag is ignored forfdopen().
Scroll down; it's under "Glibc notes". This is a non-standard extension.
An online copy of the man page is here.
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