diff options
Diffstat (limited to 'devel/sysdefs-list')
| -rwxr-xr-x | devel/sysdefs-list | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/devel/sysdefs-list b/devel/sysdefs-list new file mode 100755 index 00000000..ba51de6c --- /dev/null +++ b/devel/sysdefs-list @@ -0,0 +1,188 @@ +# Copyright all contributors <meta@public-inbox.org> +# License: AGPL-3.0+ <http://www.gnu.org/licenses/agpl-3.0.txt> +# Dump system-specific constant numbers this is to maintain +# PublicInbox::Syscall and any other system-specific pieces. +# However, sysconf(3) constants are stable ABI on all safe to dump. +eval 'exec perl -S $0 ${1+"$@"}' # no shebang + if 0; # running under some shell +use v5.12; +use File::Temp 0.19; +use POSIX qw(uname); +use Config; +print STDERR '# $machine='.(POSIX::uname())[-1]."\n"; +my $cc = $ENV{CC} // $Config{cc} // 'cc'; +my @cflags = split(/\s+/, $ENV{CFLAGS} // $Config{ccflags} // '-Wall'); +my $str = do { local $/; <DATA> }; +$str =~ s/^\s*MAYBE\s*([DX])\((\w+)\)/ +#ifdef $2 + $1($2); +#endif +/sgxm; +my $tmp = File::Temp->newdir('sysdefs-list-XXXX', TMPDIR => 1); +my $f = "$tmp/sysdefs.c"; +my $x = "$tmp/sysdefs"; +open my $fh, '>', $f or die "open $f $!"; +print $fh $str or die "print $f $!"; +close $fh or die "close $f $!"; +system($cc, '-o', $x, $f, @cflags) == 0 or die "$cc failed \$?=$?"; +print STDERR '# %Config', + (map { " $_=$Config{$_}" } qw(ptrsize sizesize lseeksize)), "\n"; +exit(system($x)); # exit is to ensure File::Temp::Dir->DESTROY fires +__DATA__ +#ifndef _GNU_SOURCE +# define _GNU_SOURCE +#endif +#include <assert.h> +#include <signal.h> +#include <stddef.h> +#include <sys/socket.h> +#include <sys/syscall.h> +#include <sys/ioctl.h> +#ifdef __linux__ +# include <linux/fs.h> +# include <sys/epoll.h> +# include <sys/inotify.h> +# include <sys/vfs.h> +#endif +#include <sys/types.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdio.h> + +#define STRUCT_BEGIN(t) do { t x; printf("'"#t"' => '%zu bytes\n", sizeof(x)) +#define STRUCT_END puts("',"); } while (0) + +// prints the struct field name, @offset, and signed/unsigned bit size +#define PR_NUM(f) do { \ + x.f = ~0; \ + printf("\t.%s @%zu %c%zu\n", #f, \ + offsetof(typeof(x),f), \ + x.f > 0 ? 'u' : 's', \ + sizeof(x.f) * 8); \ +} while (0) + +#define PR_PTR(f) do { \ + assert(sizeof(x.f) == sizeof(void *)); \ + printf("\t.%s @%zu ptr\n", #f, offsetof(typeof(x),f)); \ +} while (0) + +#define PR_OFF(f) do { \ + printf("\t.%s @%zu\n", #f, offsetof(typeof(x),f)); \ +} while (0) + +#define D(x) printf(#x " => %ld,\n", (long)x) +#define X(x) printf(#x " => 0x%lx,\n", (unsigned long)x) + +int main(void) +{ + // verify Config{(ptr|size|lseek)size} entries match: + printf("'sizeof(ptr)' => %zu,\n", sizeof(void *)); + printf("'sizeof(size_t)' => %zu,\n", sizeof(size_t)); + printf("'sizeof(off_t)' => %zu,\n", sizeof(off_t)); + +#ifdef __linux__ + D(SYS_epoll_create1); + D(SYS_epoll_ctl); + MAYBE D(SYS_epoll_wait); + D(SYS_epoll_pwait); + D(SYS_signalfd4); + + X(IN_CLOEXEC); + X(IN_ACCESS); + X(IN_ALL_EVENTS); + X(IN_ATTRIB); + X(IN_CLOSE); + X(IN_CLOSE_NOWRITE); + X(IN_CLOSE_WRITE); + X(IN_CREATE); + X(IN_DELETE); + X(IN_DELETE_SELF); + X(IN_DONT_FOLLOW); + X(IN_EXCL_UNLINK); + X(IN_IGNORED); + X(IN_ISDIR); + X(IN_MASK_ADD); + X(IN_MODIFY); + X(IN_MOVE); + X(IN_MOVED_FROM); + X(IN_MOVED_TO); + X(IN_MOVE_SELF); + X(IN_ONESHOT); + X(IN_ONLYDIR); + X(IN_OPEN); + X(IN_Q_OVERFLOW); + X(IN_UNMOUNT); + + D(SYS_inotify_init1); + D(SYS_inotify_add_watch); + D(SYS_inotify_rm_watch); + + D(SYS_prctl); + D(SYS_fstatfs); + + MAYBE X(FS_IOC_GETFLAGS); + MAYBE X(FS_IOC_SETFLAGS); + + MAYBE D(SYS_renameat2); + + STRUCT_BEGIN(struct epoll_event); + PR_NUM(events); + PR_NUM(data.u64); + STRUCT_END; + + STRUCT_BEGIN(struct inotify_event); + PR_NUM(wd); + PR_NUM(mask); + PR_NUM(cookie); + PR_NUM(len); + PR_OFF(name); + STRUCT_END; + + STRUCT_BEGIN(struct statfs); + PR_NUM(f_type); + STRUCT_END; +#endif /* Linux, any other OSes with stable syscalls? */ + + D(SIGWINCH); + MAYBE D(SO_ACCEPTFILTER); + MAYBE D(_SC_NPROCESSORS_ONLN); + MAYBE D(_SC_AVPHYS_PAGES); + MAYBE D(_SC_PAGE_SIZE); + MAYBE D(_SC_PAGESIZE); + + D(SYS_sendmsg); + D(SYS_recvmsg); + + STRUCT_BEGIN(struct flock); + PR_NUM(l_start); + PR_NUM(l_len); + PR_NUM(l_pid); + PR_NUM(l_type); + PR_NUM(l_whence); + STRUCT_END; + + STRUCT_BEGIN(struct msghdr); + PR_PTR(msg_name); + PR_NUM(msg_namelen); + PR_PTR(msg_iov); + PR_NUM(msg_iovlen); + PR_PTR(msg_control); + PR_NUM(msg_controllen); + PR_NUM(msg_flags); + STRUCT_END; + + STRUCT_BEGIN(struct cmsghdr); + PR_NUM(cmsg_len); + PR_NUM(cmsg_level); + PR_NUM(cmsg_type); + STRUCT_END; + + { + struct cmsghdr cmsg; + uintptr_t cmsg_data_off; + cmsg_data_off = (uintptr_t)CMSG_DATA(&cmsg) - (uintptr_t)&cmsg; + D(cmsg_data_off); + } + + return 0; +} |