tools/testing/selftests/net/packetdrill/tcp_syscall_bad_arg_sendmsg-empty-iov.pkt

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/net/packetdrill/tcp_syscall_bad_arg_sendmsg-empty-iov.pkt

Extension

.pkt

Size

1184 bytes

Lines

35

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: syscall or user/kernel boundary

Status

core implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or participates in a user/kernel boundary; inspect argument validation, copy_from_user/copy_to_user, credentials, and dispatch target.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
// Test that we correctly skip zero-length IOVs.

--send_omit_free	// do not reuse send buffers with zerocopy

`./defaults.sh`

    0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
   +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
   +0 bind(3, ..., ...) = 0
   +0 listen(3, 1) = 0

   +0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7>
   +0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 8>
 +.01 < . 1:1(0) ack 1 win 257
   +0 accept(3, ..., ...) = 4
   +0 setsockopt(4, SOL_TCP, TCP_NODELAY, [1], 4) = 0

   +0 sendmsg(4, {msg_name(...)=...,
                  msg_iov(4)=[{..., 0}, {..., 40}, {..., 0}, {..., 20}],
                  msg_flags=0}, 0) = 60
   +0 > P. 1:61(60) ack 1
 +.01 < . 1:1(0) ack 61 win 257

   +0 sendmsg(4, {msg_name(...)=...,
                  msg_iov(4)=[{..., 0}, {..., 0}, {..., 0}, {..., 0}],
                  msg_flags=0}, MSG_ZEROCOPY) = 0

   +0 sendmsg(4, {msg_name(...)=...,
                  msg_iov(4)=[{..., 0}, {..., 10}, {..., 0}, {..., 50}],
                  msg_flags=0}, MSG_ZEROCOPY) = 60
   +0 > P. 61:121(60) ack 1
 +.01 < . 1:1(0) ack 121 win 257

Annotation

• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: core implementation candidate.

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.