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I am trying to test errors in read operations (io.read - io.line). Does anyone know a reliable/automatic way to generate a read error on Linux? (That is, a situation where fread returns EOF and ferror returns not zero.) -- Roberto
Something like how the fakeroot does the libc call hijacking.
You can write a dynamic library that defines some libc functions:
static size_t original_fread(....) = (size_t (*) dlsym(RTLD_NEXT, fread);
extern size_t fread(....) {
size_t ret = original_fread(....);
/* some logic that injects errors */
return ret;
}
and then run your program like this:
LD_PRELOAD=fakelibc.so ./test-program