34 lines
713 B
C
34 lines
713 B
C
#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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typedef int (*real_msync_t)(void *addr, size_t length, int flags);
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int real_msync(void *addr, size_t length, int flags) {
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return ((real_msync_t)dlsym(RTLD_NEXT, "msync"))(addr, length, flags);
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}
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/*
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* Noddy LD_PRELOAD wrapper to catch msync calls, and log them to a file.
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*/
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int msync(void *addr, size_t length, int flags) {
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FILE *fd;
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char *fn;
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int retval;
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retval = real_msync(addr, length, flags);
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fn = getenv("OUTPUT_msync_logger");
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if ( fn != NULL ) {
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fd = fopen(fn,"a");
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fprintf(fd,"msync:%d:%i:%i:%i\n", addr, length, flags, retval);
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fclose(fd);
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}
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return retval;
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}
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