Linux: how to mark a file descriptor as not inheritable on fork? [duplicate]

This question already has answers here: 开发者_如何学JAVA Prevent file descriptors inheritance during Linux fork (3 answers) Closed 3 years ago.

Is it possible to mark a specific file descriptor as not inheritable, or close it, in the child process when fork() is invoked?

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No. All file descriptors are inherited in fork. You can set a fd to be closed on exec, however, by using fcntl(fd, F_SETFD, FD_CLOEXEC).

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No its not possible. By default child processes with inherit file table from parent process.

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If you really want close-on-fork, something like this could work:

static void fd_to_close;
static void closer()
{
    close(fd_to_close);
}

pthread_atfork(0, 0, closer);

Normally close-on-exec is the desired behavior anyway, though.