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Add short write to pwrite in faulty_libc.

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FHaggs
2025-10-02 16:11:15 +02:00
parent 1b991156f3
commit 095e72eac9
1 changed files with 9 additions and 0 deletions
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9
testing/unreliable-libc/file.c
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@@ -13,6 +13,8 @@ static double probabilities[] = {
[EIO] = 0.01,
};
static double short_write_probability = 0.05; // 5% chance of a short write
static bool chance(double probability)
{
double event = drand48();
@@ -37,6 +39,13 @@ ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset)
if (libc_pwrite == NULL) {
libc_pwrite = dlsym(RTLD_NEXT, "pwrite");
}
if (count > 1 && chance(short_write_probability)) {
size_t short_count = 1 + (lrand48() % (count - 1));
printf("%s: injecting fault SHORT WRITE (requesting %zu instead of %zu)\n", __func__, short_count, count);
return libc_pwrite(fd, buf, short_count, offset);
}
if (inject_fault(ENOSPC)) {
printf("%s: injecting fault NOSPC\n", __func__);
return -1;