PROBE::SIGNAL.SEND(3stap) Signal Tapset PROBE::SIGNAL.SEND(3stap)

# [NAME](#NAME)

probe::signal.send.return - Signal being sent to a process completed (deprecated in SystemTap 2.1)

# [SYNOPSIS](#SYNOPSIS)

```
probe signal.send.return {}
```

# [VALUES](#VALUES)

*retstr*

The return value to either \_\_group\_send\_sig\_info, specific\_send\_sig\_info, send\_sigqueue, or posixtimer\_send\_sigqueue

*name*

The name of the function used to send out the signal

*send2queue*

Indicates whether the sent signal was sent to an existing sigqueue

*shared*

Indicates whether the sent signal is shared by the thread group.

# [CONTEXT](#CONTEXT)

The signal's sender. (correct?)

# [DESCRIPTION](#DESCRIPTION)

Possible \_\_group\_send\_sig\_info and specific\_send\_sig\_info return values are as follows;

0 -- The signal is successfully sent to a process, which means that, (1) the signal was ignored by the receiving process, (2) this is a non-RT signal and the system already has one queued, [and (3)](/man/enterprise-packages/systemtap/and.3) the signal was successfully added to the sigqueue of the receiving process.

-EAGAIN -- The sigqueue of the receiving process is overflowing, the signal was RT, and the signal was sent by a user using something other than **kill**.

Possible send\_group\_sigqueue, send\_sigqueue, and posixtimer\_send\_sigqueue return values are as follows;

0 -- The signal was either successfully added into the sigqueue of the receiving process, or a SI\_TIMER entry is already queued (in which case, the overrun count will be simply incremented).

1 -- The signal was ignored by the receiving process.

-1 -- (send\_sigqueue / posixtimer\_send\_sigqueue only) The task was marked exiting, allowing * posix\_timer\_event to redirect it to the group leader.

# [SEE ALSO0](#SEE_ALSO0)

[*tapset::signal*(3stap)](/man/enterprise-packages/systemtap/tapset::signal.3stap)

September 2026 SystemTap Tapset Reference Ver

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Document: probe::signal.send.return(3stap) from systemtap 5.6-r0 (Chainguard OS)
Source: https://sourceware.org/git/systemtap.git