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82 lines
2.3 KiB
Awk
82 lines
2.3 KiB
Awk
# Generate SYS_* macros from a list in a text file.
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# Copyright (C) 2017-2020 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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# Emit a conditional definition for SYS_NAME.
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function emit(name) {
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print "#ifdef __NR_" name;
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print "# define SYS_" name " __NR_" name;
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print "#endif";
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print "";
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}
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# Bail out with an error.
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function fatal(message) {
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print FILENAME ":" FNR ": " message > "/dev/stderr";
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exit 1;
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}
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BEGIN {
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name = "";
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kernel = "";
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}
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# Skip empty lines and comments.
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/^\s*(|#.*)$/ {
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next;
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}
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# Kernel version. Used for documentation purposes only.
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/^kernel [0-9.]+$/ {
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if (kernel != "") {
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fatal("duplicate kernel directive");
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}
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kernel = $2;
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print "/* Generated at libc build time from syscall list. */";
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print "/* The system call list corresponds to kernel " kernel ". */";
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print "";
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print "#ifndef _SYSCALL_H"
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print "# error \"Never use <bits/syscall.h> directly; include <sys/syscall.h> instead.\"";
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print "#endif";
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print "";
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split($2, kernel_version, ".");
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kernel_major = kernel_version[1];
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kernel_minor = kernel_version[2];
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kernel_version_code = kernel_major * 65536 + kernel_minor * 256;
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print "#define __GLIBC_LINUX_VERSION_CODE " kernel_version_code;
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print "";
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next;
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}
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# If there is just one word, it is a system call.
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/^[a-zA-Z_][a-zA-Z0-9_]+$/ {
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if (kernel == "") {
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fatal("expected kernel directive before this line");
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}
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if ($1 <= name) {
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fatal("name " name " violates ordering");
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}
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emit($1);
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name = $1;
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next;
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}
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# The rest has to be syntax errors.
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// {
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fatal("unrecognized syntax");
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}
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