probe: read the kernel's numbers from the system's own table #1
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| name: numbers | |
| # The kernel's own table, read from the system rather than remembered. | |
| # | |
| # src/sys.h states a number for each call this implementation makes. A number | |
| # that is wrong for one architecture is not a compile error and not a failed | |
| # call: the kernel raises a signal whose name is "bad system call" and the | |
| # program stops, which is a diagnostic that names the program rather than the | |
| # number. So the numbers are read from the system's own header, on both | |
| # architectures, and this workflow is where the reading is recorded. | |
| on: | |
| workflow_dispatch: | |
| push: | |
| paths: | |
| - '.github/workflows/numbers.yml' | |
| jobs: | |
| numbers: | |
| name: the kernel's numbers (${{ matrix.os }}) | |
| runs-on: ${{ matrix.os }} | |
| timeout-minutes: 15 | |
| strategy: | |
| fail-fast: false | |
| matrix: | |
| os: [macos-14, macos-13] | |
| steps: | |
| - uses: actions/checkout@v4 | |
| - name: Where the table is | |
| run: | | |
| uname -m | |
| xcrun --show-sdk-path | |
| find "$(xcrun --show-sdk-path)/usr/include/sys" -name 'syscall.h' | |
| - name: Every number this implementation uses | |
| run: | | |
| h="$(xcrun --show-sdk-path)/usr/include/sys/syscall.h" | |
| for n in exit read write close wait4 chdir fchdir fork getpid getuid \ | |
| geteuid kill dup getegid getgid ioctl execve umask munmap \ | |
| mprotect madvise dup2 fsync gettimeofday readv writev \ | |
| ftruncate truncate mmap lseek __getcwd getcwd \ | |
| stat stat64 fstat fstat64 lstat lstat64 \ | |
| fstatat fstatat64 getdirentries getdirentries64 \ | |
| bsdthread_terminate thread_selfid \ | |
| open openat openat_nocancel renameat faccessat unlinkat \ | |
| readlinkat mkdirat rmdir unlink mkdir rename access \ | |
| ulock_wait ulock_wake __ulock_wait __ulock_wake \ | |
| pipe sigaction; do | |
| printf '%-24s' "$n" | |
| grep -E "^#define[[:space:]]+SYS_${n}[[:space:]]" "$h" | head -1 || echo '(absent)' | |
| done | |
| - name: The whole table, for the record | |
| run: | | |
| h="$(xcrun --show-sdk-path)/usr/include/sys/syscall.h" | |
| wc -l "$h" | |
| grep -c '^#define' "$h" | |
| # Uploaded rather than printed in full: it is nine hundred lines. | |
| cp "$h" "syscall-$(uname -m).h" | |
| - uses: actions/upload-artifact@v4 | |
| with: | |
| name: syscall-numbers-${{ matrix.os }} | |
| path: syscall-*.h |