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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char* argv[]) {
if (argc < 3) {
printf("Usage: %s [-p LD_PRELOAD] [-l LD_LIBRARY_PATH] <cmd> [cmd args]\n");
printf("\tset LD_PRELOAD to ld_preload and call execvp <cmd> [cmd args]\n");
return 1;
}
int i = 1;
for (; i < argc; i++) {
// Overwrite LD_PRELOAD.
if (strncmp(argv[i], "-p", 2) == 0) {
setenv("LD_PRELOAD", argv[i+1], 1);
i++;
// Overwrite LD_LIBRARY_PATH.
} else if (strncmp(argv[i], "-l", 2) == 0) {
setenv("LD_LIBRARY_PATH", argv[i+1], 1);
i++;
} else {
break;
}
}
// Run cmd.
execvp(argv[i], &argv[i]);
}
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