1*4882a593Smuzhiyun#!/bin/sh 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun# This script (and the embedded C code) will check that the actual 4*4882a593Smuzhiyun# headers version match the user told us they were: 5*4882a593Smuzhiyun# 6*4882a593Smuzhiyun# - if both versions are the same, all is well. 7*4882a593Smuzhiyun# 8*4882a593Smuzhiyun# - if the actual headers are older than the user told us, this is 9*4882a593Smuzhiyun# an error. 10*4882a593Smuzhiyun# 11*4882a593Smuzhiyun# - if the actual headers are more recent than the user told us, and 12*4882a593Smuzhiyun# we are doing a strict check, then this is an error. 13*4882a593Smuzhiyun# 14*4882a593Smuzhiyun# - if the actual headers are more recent than the user told us, and 15*4882a593Smuzhiyun# we are doing a loose check, then a warning is printed, but this is 16*4882a593Smuzhiyun# not an error. 17*4882a593Smuzhiyun 18*4882a593SmuzhiyunBUILDDIR="${1}" 19*4882a593SmuzhiyunSYSROOT="${2}" 20*4882a593Smuzhiyun# Make sure we have enough version components 21*4882a593SmuzhiyunHDR_VER="${3}.0.0" 22*4882a593SmuzhiyunCHECK="${4}" # 'strict' or 'loose' 23*4882a593Smuzhiyun 24*4882a593SmuzhiyunHDR_M="${HDR_VER%%.*}" 25*4882a593SmuzhiyunHDR_V="${HDR_VER#*.}" 26*4882a593SmuzhiyunHDR_m="${HDR_V%%.*}" 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun# Exit on any error, so we don't try to run an unexisting program if the 29*4882a593Smuzhiyun# compilation fails. 30*4882a593Smuzhiyunset -e 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun# Set the clean-up trap in advance to prevent a race condition in which we 33*4882a593Smuzhiyun# create the file but get a SIGTERM before setting it. Notice that we don't 34*4882a593Smuzhiyun# need to care about EXEC being empty, since 'rm -f ""' does nothing. 35*4882a593Smuzhiyuntrap 'rm -f "${EXEC}"' EXIT 36*4882a593Smuzhiyun 37*4882a593SmuzhiyunEXEC="$(mktemp -p "${BUILDDIR}" -t .check-headers.XXXXXX)" 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun# We do not want to account for the patch-level, since headers are 40*4882a593Smuzhiyun# not supposed to change for different patchlevels, so we mask it out. 41*4882a593Smuzhiyun# This only applies to kernels >= 3.0, but those are the only one 42*4882a593Smuzhiyun# we actually care about; we treat all 2.6.x kernels equally. 43*4882a593Smuzhiyun${HOSTCC} -imacros "${SYSROOT}/usr/include/linux/version.h" \ 44*4882a593Smuzhiyun -x c -o "${EXEC}" - <<_EOF_ 45*4882a593Smuzhiyun#include <stdio.h> 46*4882a593Smuzhiyun#include <stdlib.h> 47*4882a593Smuzhiyun#include <string.h> 48*4882a593Smuzhiyun 49*4882a593Smuzhiyunint main(int argc __attribute__((unused)), 50*4882a593Smuzhiyun char** argv __attribute__((unused))) 51*4882a593Smuzhiyun{ 52*4882a593Smuzhiyun int l = LINUX_VERSION_CODE & ~0xFF; 53*4882a593Smuzhiyun int h = KERNEL_VERSION(${HDR_M},${HDR_m},0); 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun if ((l >= h) && !strcmp("${CHECK}", "loose")) 56*4882a593Smuzhiyun return 0; 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun if (l != h) { 59*4882a593Smuzhiyun printf("Incorrect selection of kernel headers: "); 60*4882a593Smuzhiyun printf("expected %d.%d.x, got %d.%d.x\n", ${HDR_M}, ${HDR_m}, 61*4882a593Smuzhiyun ((LINUX_VERSION_CODE>>16) & 0xFF), 62*4882a593Smuzhiyun ((LINUX_VERSION_CODE>>8) & 0xFF)); 63*4882a593Smuzhiyun return 1; 64*4882a593Smuzhiyun } 65*4882a593Smuzhiyun return 0; 66*4882a593Smuzhiyun} 67*4882a593Smuzhiyun_EOF_ 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun"${EXEC}" 70