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# Generate SYS_* macros from a list in a text file.
# Copyright (C) 2017-2021 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
#
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.
# Emit a conditional definition for SYS_NAME.
function emit(name) {
print "#ifdef __NR_" name;
print "# define SYS_" name " __NR_" name;
print "#endif";
print "";
}
# Bail out with an error.
function fatal(message) {
print FILENAME ":" FNR ": " message > "/dev/stderr";
exit 1;
}
BEGIN {
name = "";
kernel = "";
}
# Skip empty lines and comments.
/^\s*(|#.*)$/ {
next;
}
# Kernel version. Used for documentation purposes only.
/^kernel [0-9.]+$/ {
if (kernel != "") {
fatal("duplicate kernel directive");
}
kernel = $2;
print "/* Generated at libc build time from syscall list. */";
print "/* The system call list corresponds to kernel " kernel ". */";
print "";
print "#ifndef _SYSCALL_H"
print "# error \"Never use <bits/syscall.h> directly; include <sys/syscall.h> instead.\"";
print "#endif";
print "";
split($2, kernel_version, ".");
kernel_major = kernel_version[1];
kernel_minor = kernel_version[2];
kernel_version_code = kernel_major * 65536 + kernel_minor * 256;
print "#define __GLIBC_LINUX_VERSION_CODE " kernel_version_code;
print "";
next;
}
# If there is just one word, it is a system call.
/^[a-zA-Z_][a-zA-Z0-9_]+$/ {
if (kernel == "") {
fatal("expected kernel directive before this line");
}
if ($1 <= name) {
fatal("name " name " violates ordering");
}
emit($1);
name = $1;
next;
}
# The rest has to be syntax errors.
// {
fatal("unrecognized syntax");
}
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