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From: Florian Weimer <fw@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/fw/syscall-cleanups] Linux: Enhance glibcsyscalls.h to support listing system calls Date: Sun, 09 Feb 2020 16:55:00 -0000 [thread overview] Message-ID: <20200209165539.79509.qmail@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=aff7fcc5ee68faa1334ccfe8066ae3c42d927fe8 commit aff7fcc5ee68faa1334ccfe8066ae3c42d927fe8 Author: Florian Weimer <fweimer@redhat.com> Date: Sun Feb 9 16:53:51 2020 +0100 Linux: Enhance glibcsyscalls.h to support listing system calls The script can now be called to query the definition status of system call numbers across all architectures, like this: $ python3 sysdeps/unix/sysv/linux/glibcsyscalls.py query-syscall sync_file_range sync_file_range2 sync_file_range: defined: aarch64 alpha csky hppa i386 ia64 m68k microblaze mips/mips32 mips/mips64/n32 mips/mips64/n64 nios2 riscv/rv64 s390/s390-32 s390/s390-64 sh sparc/sparc32 sparc/sparc64 x86_64/64 x86_64/x32 undefined: arm powerpc/powerpc32 powerpc/powerpc64 sync_file_range2: defined: arm powerpc/powerpc32 powerpc/powerpc64 undefined: aarch64 alpha csky hppa i386 ia64 m68k microblaze mips/mips32 mips/mips64/n32 mips/mips64/n64 nios2 riscv/rv64 s390/s390-32 s390/s390-64 sh sparc/sparc32 sparc/sparc64 x86_64/64 x86_64/x32 Diff: --- sysdeps/unix/sysv/linux/glibcsyscalls.py | 86 +++++++++++++++++++++++++++++++- 1 file changed, 85 insertions(+), 1 deletion(-) diff --git a/sysdeps/unix/sysv/linux/glibcsyscalls.py b/sysdeps/unix/sysv/linux/glibcsyscalls.py index de4d707..5beac42 100644 --- a/sysdeps/unix/sysv/linux/glibcsyscalls.py +++ b/sysdeps/unix/sysv/linux/glibcsyscalls.py @@ -17,9 +17,12 @@ # License along with the GNU C Library; if not, see # <http://www.gnu.org/licenses/>. +import os import re -import glibcextract +if __name__ != '__main__': + # When called as a main program, this is not needed. + import glibcextract def extract_system_call_name(macro): """Convert the macro name (with __NR_) to a system call name.""" @@ -168,3 +171,84 @@ def linux_kernel_version(cc): val = glibcextract.compute_c_consts(sym_data, cc)['LINUX_VERSION_CODE'] val = int(val) return ((val & 0xff0000) >> 16, (val & 0xff00) >> 8) + +class ArchSyscall: + """Canonical name and location of a syscall header.""" + + def __init__(self, name, path): + self.name = name + self.path = path + + def __repr__(self): + return 'ArchSyscall(name={!r}, patch={!r})'.format( + self.name, self.path) + +def list_arch_syscall_headers(topdir): + """A generator which returns all the ArchSyscall objects in a tree.""" + + sysdeps = os.path.join(topdir, 'sysdeps', 'unix', 'sysv', 'linux') + for root, dirs, files in os.walk(sysdeps): + if root != sysdeps: + for filename in files: + if filename == 'arch-syscall.h': + yield ArchSyscall( + name=os.path.relpath(root, sysdeps), + path=os.path.join(root, filename)) + +def __main(): + """Entry point when called as the main program.""" + + import sys + + # Top-level directory of the source tree. + topdir = os.path.realpath(os.path.join( + os.path.dirname(os.path.realpath(__file__)), *('..',) * 4)) + + def usage(status): + print('usage: glibcsyscalls list-headers') + print(' glibcsyscalls query-syscall SYSCALL...') + sys.exit(status) + + if len(sys.argv) <= 1: + usage(0) + + command = sys.argv[1] + if command == 'list-headers': + # Print the absolute paths of all arch-syscall.h header files. + if len(sys.argv) != 2: + usage(1) + for header in sorted([syscall.path for syscall + in list_arch_syscall_headers(topdir)]): + print(header) + + elif command == 'query-syscall': + # Summarize the implementation status of the specified system calls. + if len(sys.argv) < 3: + usage(1) + + # List of system call tables. + tables = sorted(list_arch_syscall_headers(topdir), + key=lambda syscall: syscall.name) + for table in tables: + table.numbers = load_arch_syscall_header(table.path) + + for nr in sys.argv[2:]: + defined = [table.name for table in tables + if nr in table.numbers] + undefined = [table.name for table in tables + if nr not in table.numbers] + if not defined: + print('{}: not defined on any architecture'.format(nr)) + elif not undefined: + print('{}: defined on all architectures'.format(nr)) + else: + print('{}:'.format(nr)) + print(' defined: {}'.format(' '.join(defined))) + print(' undefined: {}'.format(' '.join(undefined))) + + else: + # Unrecognized command. + usage(1) + +if __name__ == '__main__': + __main()
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