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Bootstrap: gethostname() VM path — libc gethostname(2) without host PHP (phpc_gethostname.c) #5022
Description
Category
bootstrap · stdlib
Problem
gethostname() VM path calls VmHost::gethostname() which delegates to host Zend PHP \gethostname(). For self-host / AOT (#1492), the VM must not depend on Zend for this syscall.
JIT/AOT already use __compiler_gethostname from lib/AOT/runtime/phpc_gethostname.c (#3465); VM execute path is the gap.
php-src reference
- php/php-src
ext/standard/basic_functions.c—PHP_FUNCTION(gethostname) - Existing native runtime:
lib/AOT/runtime/phpc_gethostname.c(gethostname(2))
Repro
On a host without PHP gethostname() (or under bootstrap policy that forbids host calls):
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php -r "var_dump(gethostname());"'Today VM always routes through VmHost → \gethostname(). Bootstrap inventory includes ext/standard/gethostname.php — native VM should call the same C helper as JIT.
Compare JIT path (already native):
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && ./vendor/bin/phpunit test/compliance/GethostnameJITTest.php -v'Scope (this repo)
| Area | Path |
|---|---|
| VM | ext/standard/gethostname.php, ext/standard/VmHost.php — call __compiler_gethostname or shared wrapper |
| Runtime link | Reuse phpc_gethostname.c in VM native bridge (same as #3465) |
| Tests | Extend test/unit/GethostnameBuiltinTest.php — no host gethostname mock |
Done when
bin/vm.php -r "echo gethostname();"returns a non-empty string using libc only (no\gethostname()in VM execute path).- JIT/AOT behavior unchanged;
make bootstrap-inventory.php --checkstill green forgethostname.php.
Activity
PurHur commentedon Jun 8, 2026
claim: PHP Runtime → PHP — starting this run (#5022: VmHost gethostname via libc FFI, no host \gethostname() delegation).
gethostname() VM path: libc FFI instead of host PHP (#5022) (#7716)
PurHur commentedon Jun 8, 2026
Merged via #7716.
Change:
VmHost::gethostname()routes through libcgethostname(2)via FFI (256-byte buffer, same failure semantics asJitGethostname). Removed host Zend@\gethostname()delegation on the VM execute path.C runtime: no new C;
phpc_gethostname.calready absent — VM now aligns with existing JIT/AOT libc path.Verification (green):
php bin/vm.php -r "var_dump(gethostname());"→ non-empty hostname stringvendor/bin/phpunit --filter "GethostnameBuiltinTest|VmHostTest|GethostnameVMTest|GethostnameJITTest"→ OK (6 tests)