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ext/pcntl: Bump num_signals to uint16_t - #21347
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On AIX, NSIG is def'd as SIGMAX64+1, and SIGMAX64 itself is def'd as 255: ``` $ grep -Rw SIGMAX64 /QOpenSys/usr/include/ /QOpenSys/usr/include/sys/signal.h:#define SIGMAX64 255 /QOpenSys/usr/include/sys/signal.h:#define SIGMAX SIGMAX64 /QOpenSys/usr/include/sys/signal.h:#define NSIG64 (SIGMAX64+1) ``` ...this causes an overflow when we set num_signals from the value of NSIG, per GCC: ``` /rpmbuild/BUILD/php-8.5.3/ext/pcntl/pcntl.c:216:25: warning: large integer implicitly truncated to unsigned type [-Woverflow] PCNTL_G(num_signals) = NSIG; ^~~~ ``` ...when we try to use pcntl to i.e. install a signal handler, we get an error from pcntl: ``` Fatal error: Uncaught ValueError: pcntl_signal(): Argument #1 ($signal) must be less than 0 in phar:///QOpenSys/pkgs/bin/composer/vendor/seld/signal-handler/src/SignalHandler.php:491 ``` The easiest way to deal with this silly AIX behaviour is to just promote the storage size.
devnexen
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Mar 5, 2026
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looks safe change, did you have a quick look with pahole or similar ? |
NattyNarwhal
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Mar 5, 2026
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I haven't used pahole, no. I'm guessing this does slightly blow up the size of the structure, as the bools and previous uint8 would have been packed into 32 bits. |
devnexen
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Mar 5, 2026
| bool async_signals; | ||
| uint8_t num_signals; | ||
| /* some OSes define NSIG to be > UINT8_MAX */ | ||
| uint16_t num_signals; |
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This adds padding before num_signals. Just to confirm: This is a private header, right?
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I believe the only thing that references it is pcntl.c, yes. It shouldn't be installed either.
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NattyNarwhal added a commit
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Mar 9, 2026
* PHP-8.5: Update NEWS for pcntl fix [skip ci] ext/pcntl: Bump num_signals to uint16_t (#21347)
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On AIX, NSIG is def'd as SIGMAX64+1, and SIGMAX64 itself is def'd as 255:
...this causes an overflow when we set num_signals from the value of NSIG, per GCC:
...when we try to use pcntl to i.e. install a signal handler, we get an error from pcntl:
The easiest way to deal with this silly AIX behaviour is to just promote the storage size.