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1.8 KiB
1.8 KiB
Name
proc - SerenityOS ProcFS
Description
The kernel can expose process related information in /proc. This functionality is used by various userland programs. All of the output layout (besides symbolic links) in the ProcFS nodes is JSON.
Per process entries
cwd- a symbolic link to current work directory of a process.exe- a symbolic link to the executable binary of the process.fds- this node exports information on all currently open file descriptors.fd- this directory lists all currently open file descriptors.perf_events- this node exports information being gathered during a profile on a process.pledge- this node exports information on all the pledge requests and promises of a process.stacks- this directory lists all stack traces of process threads.unveil- this node exports information on all the unveil requests of a process.vm- this node exports information on virtual memory mappings of a process.children- this directory lists all the child processes of a process.
Consistency and stability of data across multiple read operations
When opening a data node, the kernel generates the required data so it's prepared
for read operation when requested to. However, in order to ensure that multiple reads
will not create a corrupted data from that data node, a read operation alone will
not inquire the kernel to refresh the data.
To keep data output being refreshed, the userland has to re-open the data node with a
new file descriptor, or to perform the lseek syscall on the open file descriptor to
reset the offset to 0.