Error handler support #93
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## dev/gfdl #93 +/- ##
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- Coverage 29.02% 28.99% -0.03%
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Files 245 246 +1
Lines 72223 72296 +73
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+ Hits 20962 20963 +1
- Misses 51261 51333 +72
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This patch introduces some limited support for error handling in a POSIX environment. A partial interface to the POSIX system calls is included as part of the implementation of this feature. An internal global logical flag, `ignore_fatal` is added to the `MOM_error_handler` module which controls the behavior of `FATAL` errors. If true, then `FATAL` errors trigger a signal (here `SIGUSR1`) which call a handler which restores the program to the earlier state. This change allows us to test `FATAL` errors at runtime without stopping program execution, so that we can cycle through multiple errors. This feature is toggled with two new functions, `disable_fatal_errors()` and `enable_fatal_errors()`. This is implemented in part using POSIX system calls from the C standard library (libc), using the C interoperability layer. Details which are unspecified by the POSIX standard, such as the definitions of signals or the datatype size, are defined in a header (`posix.h`) which can be optionally configured at compile-time. The header defaults to use typical Linux POSIX values, and may be configured by autoconf for more exotic platforms in a later patch. The previous state is set and restored by the `setjmp`/`longjmp` (or `sigsetjmp`/`siglongjmp`) functions. Although these functions behave as expected on all tested platforms, a code which uses these functions is not standards-conforming. If issues arise in the future, error handling may not be available on those platforms, and compile-time configuration may be required to disable these features. No existing code is using these features, but are expected to be part of a future patch. Error handler API: * `disable_fatal_errors` * `enable_fatal_errors` New POSIX API: * `chmod` * `signal` * `kill` * `getpid` * `getppid` * `sleep` * `setjmp` * `sigsetjmp` * `longjmp` * `siglongjmp` New derived types: * `jmp_buf` * `sigjmp_buf` New interface (for signal handlers): * `handler_interface` New compile-time macros: * `JMP_BUF_SIZE` * `SIGJMP_BUF_SIZE` * `SIGSETJMP_NAME` * `POSIX_SIGUSR1`
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While not necessarily the most appropriate place for it, it is the simplest place to park it for now. We can move it around when we have a more robust method of autogenerating the filepaths. |
adcroft
approved these changes
Mar 28, 2022
This was referenced May 16, 2022
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This patch introduces some limited support for error handling in a POSIX
environment. A partial interface to the POSIX system calls is included
as part of the implementation of this feature.
An internal global logical flag,
ignore_fatalis added to theMOM_error_handlermodule which controls the behavior ofFATALerrors. If true, then
FATALerrors trigger a signal (hereSIGUSR1)which call a handler which restores the program to the earlier state.
This change allows us to test
FATALerrors at runtime without stoppingprogram execution, so that we can cycle through multiple errors.
This feature is toggled with two new functions,
disable_fatal_errors()and
enable_fatal_errors().This is implemented in part using POSIX system calls from the C standard
library (libc), using the C interoperability layer. Details which are
unspecified by the POSIX standard, such as the definitions of signals or
the datatype size, are defined in a header (
posix.h) which can beoptionally configured at compile-time.
The header defaults to use typical Linux POSIX values, and may be
configured by autoconf for more exotic platforms in a later patch.
The previous state is set and restored by the
setjmp/longjmp(orsigsetjmp/siglongjmp) functions. Although these functions behave asexpected on all tested platforms, a code which uses these functions is
not standards-conforming. If issues arise in the future, error handling
may not be available on those platforms, and compile-time configuration
may be required to disable these features.
No existing code is using these features, but are expected to be part of
a future patch.
Error handler API:
disable_fatal_errorsenable_fatal_errorsNew POSIX API:
chmodsignalkillgetpidgetppidsleepsetjmpsigsetjmplongjmpsiglongjmpNew derived types:
jmp_bufsigjmp_bufNew interface (for signal handlers):
handler_interfaceNew compile-time macros:
JMP_BUF_SIZESIGJMP_BUF_SIZESIGSETJMP_NAMEPOSIX_SIGUSR1