iself.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
static void check_elf(const char *fname)
{
static const unsigned char magic[4] = { 0x7F, 0x45, 0x4C, 0x46 };
size_t br = 0;
unsigned char buf[4];
FILE *f = fopen(fname, "rb");
if (f == NULL)
{
fprintf(stderr, "Can't open %s: %s\n", fname, strerror(errno));
return;
}
br = fread(buf, 4, 1, f);
fclose(f);
if (br != 1)
{
if (ferror(f))
fprintf(stderr, "Can't read %s: %s\n", fname, strerror(errno));
return;
}
if (memcmp(buf, magic, 4) == 0)
printf("%s\n", fname);
}
int main(int argc, const char **argv)
{
int i;
for (i = 1; i < argc; i++)
check_elf(argv[i]);
return 0;
}
// end of iself.c ...