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A fileWrite request writes given contents to a given file. A fileWrite request is encoded as an lgcio request containing the following bytes:
First comes one byte which identifies the lgcio request as a fileWrite request. The value of that byte happens to be 1.
Then comes the path name p of the file be written. The path can be given as a vector tree. The path is not allowed to contain null characters.
Then comes a null character.
Finally comes the contents to be written to the file with no terminating null character. The contents is allowed to contain null characters.
To ease forging a fileWrite request, the base page defines the following construct:
The reply has form
where p is the empty list.
If the file does not exist, it is created with mode 0666 (read/write access to everybody). For a value of umask such as 0022 this results in mode 0644 (read/write to user, read to everybody).
fileWriteExec is similar but uses mode 0777 instead of mode 0666. Hence, created files become executable.
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