#!/bin/sh
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# This script (and the embedded C code) will check that the actual
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# headers version match the user told us they were:
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#
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# - if both versions are the same, all is well.
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#
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# - if the actual headers are older than the user told us, this is
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# an error.
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#
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# - if the actual headers are more recent than the user told us, and
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# we are doing a strict check, then this is an error.
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#
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# - if the actual headers are more recent than the user told us, and
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# we are doing a loose check, then a warning is printed, but this is
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# not an error.
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BUILDDIR="${1}"
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SYSROOT="${2}"
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# Make sure we have enough version components
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HDR_VER="${3}.0.0"
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CHECK="${4}" # 'strict' or 'loose'
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HDR_M="${HDR_VER%%.*}"
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HDR_V="${HDR_VER#*.}"
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HDR_m="${HDR_V%%.*}"
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# Exit on any error, so we don't try to run an unexisting program if the
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# compilation fails.
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set -e
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# Set the clean-up trap in advance to prevent a race condition in which we
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# create the file but get a SIGTERM before setting it. Notice that we don't
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# need to care about EXEC being empty, since 'rm -f ""' does nothing.
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trap 'rm -f "${EXEC}"' EXIT
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EXEC="$(mktemp -p "${BUILDDIR}" -t .check-headers.XXXXXX)"
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# We do not want to account for the patch-level, since headers are
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# not supposed to change for different patchlevels, so we mask it out.
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# This only applies to kernels >= 3.0, but those are the only one
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# we actually care about; we treat all 2.6.x kernels equally.
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${HOSTCC} -imacros "${SYSROOT}/usr/include/linux/version.h" \
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-x c -o "${EXEC}" - <<_EOF_
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int main(int argc __attribute__((unused)),
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char** argv __attribute__((unused)))
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{
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int l = LINUX_VERSION_CODE & ~0xFF;
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int h = KERNEL_VERSION(${HDR_M},${HDR_m},0);
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if ((l >= h) && !strcmp("${CHECK}", "loose"))
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return 0;
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if (l != h) {
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printf("Incorrect selection of kernel headers: ");
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printf("expected %d.%d.x, got %d.%d.x\n", ${HDR_M}, ${HDR_m},
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((LINUX_VERSION_CODE>>16) & 0xFF),
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((LINUX_VERSION_CODE>>8) & 0xFF));
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return 1;
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}
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return 0;
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}
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_EOF_
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"${EXEC}"
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