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3.4 KiB
3.4 KiB
Name
proc - SerenityOS ProcFS
Description
The kernel can expose process related information in /proc. This functionality is used by various userland programs. Most of the output layout in the ProcFS nodes is JSON.
Global entries
all- this node exports a list of all processes that currently exist.cmdline- this node exports the kernel boot commandline that was passed to from the bootloader.cpuinfo- this node exports information on the CPU.devices- this node exports information on all devices that might be represented by a device file.df- this node exports information on mounted filesystems and basic statistics on them.dmesg- this node exports information from the kernel log.interrupts- this node exports information on all IRQ handlers and basic statistics on them.kernel_base- this node reveals the loading address of the kernel.keymap- this node exports information on current used keymap.memstat- this node exports statistics on memory allocation in the kernel.pci- this node exports information on all currently-discovered PCI devices in the system.
net directory
adapters- this node exports information on all currently-discovered network adapters.arp- this node exports information on the kernel ARP table.local- this node exports information on local (unix) sockets.tcp- this node exports information on tcp sockets.udp- this node exports information on udp sockets.
sys directory
This subdirectory includes global settings of the kernel.
caps_lock_to_ctrl- this node controls remapping of of caps lock to the Ctrl key.kmalloc_stacks- this node controls whether to send information about kmalloc to debug log.ubsan_is_deadly- this node controls the deadliness of the kernel undefined behavior sanitizer errors.
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.
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 the offset to 0.