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Add instruction to suppress SIGUSR1 in Posix with LLDB debugger #1245

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Feb 12, 2025
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Add instruction to suppress SIGUSR1 in Posix with LLDB debugger #1245

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5 changes: 5 additions & 0 deletions portable/ThirdParty/GCC/Posix/port.c
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,11 @@
* stdio (printf() and friends) should be called from a single task
* only or serialized with a FreeRTOS primitive such as a binary
* semaphore or mutex.
*
* Note: When using LLDB (the default debugger on macOS) with this port,
* suppress SIGUSR1 to prevent debugger interference. This can be
* done by adding the following line to ~/.lldbinit:
* `process handle SIGUSR1 -n true -p true -s false`
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This still does not work for me. I had to set both PASS and STOP to false. NOTIFY had no effect for me

process handle SIGUSR1 -p false -s false

> echo 'process handle SIGUSR1 -n true -p true -s false' > ~/.lldbinit
> lldb build/freertos_posix_example
NAME         PASS     STOP     NOTIFY
===========  =======  =======  =======
SIGUSR1      true     false    true
(lldb) target create "build/freertos_posix_example"
Current executable set to '/Users/johnboiles/Developer/repos/FreeRTOS/freertos-pr1224/build/freertos_posix_example' (arm64).
(lldb) pro la
Process 92245 launched: '/Users/johnboiles/Developer/repos/FreeRTOS/freertos-pr1224/build/freertos_posix_example' (arm64)
Starting FreeRTOS scheduler
FreeRTOS scheduler started
Task Done, ending scheduler
Process 92245 stopped and restarted: thread 1 received signal: SIGUSR1
Process 92245 exited with status = 30 (0x0000001e) Terminated due to signal 30
(lldb) ^D
> echo 'process handle SIGUSR1 -p false -s false' > ~/.lldbinit
> lldb build/freertos_posix_example
NAME         PASS     STOP     NOTIFY
===========  =======  =======  =======
SIGUSR1      false    false    not set
(lldb) target create "build/freertos_posix_example"
Current executable set to '/Users/johnboiles/Developer/repos/FreeRTOS/freertos-pr1224/build/freertos_posix_example' (arm64).
(lldb) pro la
Process 24334 launched: '/Users/johnboiles/Developer/repos/FreeRTOS/freertos-pr1224/build/freertos_posix_example' (arm64)
Starting FreeRTOS scheduler
FreeRTOS scheduler started
Task Done, ending scheduler
Process 24334 stopped and restarted: thread 1 received signal: SIGUSR1
FreeRTOS scheduler exited
Process 24334 exited with status = 0 (0x00000000)

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Well, yes. That seems right! Will update that, thank you.

*----------------------------------------------------------*/
#ifdef __linux__
#define _GNU_SOURCE
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