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check for MAP_FAILED result
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@ -166,7 +166,7 @@ main(int argc, const char *argv[])
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*/
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addr = mmap(NULL, file_size, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_SHARED, fd, 0);
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if (addr == NULL) {
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if (addr == NULL || addr == MAP_FAILED) {
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(void)fprintf(stderr, "%s: could not mmap %s: %s\n",
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progname, filename, strerror(errno));
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exit(1);
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