drivers/net/ppp/ppp_synctty.c

File Facts

System

Linux kernel

Corpus path

drivers/net/ppp/ppp_synctty.c

Extension

.c

Size

16800 bytes

Lines

735

Domain

Driver Families

Bucket

drivers/net

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/module.h
• linux/kernel.h
• linux/skbuff.h
• linux/tty.h
• linux/netdevice.h
• linux/poll.h
• linux/ppp_defs.h
• linux/ppp-ioctl.h
• linux/ppp_channel.h
• linux/spinlock.h
• linux/completion.h
• linux/init.h
• linux/interrupt.h
• linux/slab.h
• linux/refcount.h
• linux/unaligned.h
• linux/uaccess.h

Detected Declarations

• struct syncppp
• function ppp_print_buffer
• function sp_put
• function ppp_sync_open
• function ppp_sync_close
• function ppp_sync_hangup
• function ppp_sync_read
• function ppp_sync_write
• function ppp_synctty_ioctl
• function ppp_sync_receive
• function ppp_sync_wakeup
• function ppp_sync_init
• function ppp_sync_ioctl
• function ppp_sync_process
• function ppp_sync_txmunge
• function ppp_sync_send
• function ppp_sync_push
• function ppp_sync_flush_output
• function ppp_sync_input
• function ppp_sync_cleanup
• module init ppp_sync_init

Annotated Snippet

module_init(ppp_sync_init);
module_exit(ppp_sync_cleanup);
MODULE_DESCRIPTION("PPP synchronous TTY channel module");
MODULE_LICENSE("GPL");
MODULE_ALIAS_LDISC(N_SYNC_PPP);

Annotation

• Immediate include surface: `linux/module.h`, `linux/kernel.h`, `linux/skbuff.h`, `linux/tty.h`, `linux/netdevice.h`, `linux/poll.h`, `linux/ppp_defs.h`, `linux/ppp-ioctl.h`.
• Detected declarations: `struct syncppp`, `function ppp_print_buffer`, `function sp_put`, `function ppp_sync_open`, `function ppp_sync_close`, `function ppp_sync_hangup`, `function ppp_sync_read`, `function ppp_sync_write`, `function ppp_synctty_ioctl`, `function ppp_sync_receive`.
• Atlas domain: Driver Families / drivers/net.
• Implementation status: integration implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.