native: Ignore stdio fds with /dev/null #14477
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When spawning a process, stdio file descriptors can be configured to be ignored, which basically means that they'll be closed. Currently this is done by literally closing the file descriptors in the child, but this can have adverse side effects if the child process then opens a new file descriptor, assigning it to a stdio number. To work around the problems of the child, this commit alters the process spawning code to map stdio fds to /dev/null on unix (and a similar equivalent on windows) when they are specified as being ignored. This should allow spawned programs to have more expected behavior when opening new files. Closes rust-lang#14456
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When spawning a process, stdio file descriptors can be configured to be ignored, which basically means that they'll be closed. Currently this is done by literally closing the file descriptors in the child, but this can have adverse side effects if the child process then opens a new file descriptor, assigning it to a stdio number. To work around the problems of the child, this commit alters the process spawning code to map stdio fds to /dev/null on unix (and a similar equivalent on windows) when they are specified as being ignored. This should allow spawned programs to have more expected behavior when opening new files. Closes #14456
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Damn, nice catch. |
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Props to @glandium for finding this! |
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When spawning a process, stdio file descriptors can be configured to be ignored,
which basically means that they'll be closed. Currently this is done by
literally closing the file descriptors in the child, but this can have adverse
side effects if the child process then opens a new file descriptor, assigning it
to a stdio number.
To work around the problems of the child, this commit alters the process
spawning code to map stdio fds to /dev/null on unix (and a similar equivalent on
windows) when they are specified as being ignored. This should allow spawned
programs to have more expected behavior when opening new files.
Closes #14456