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Add random connect() letencies and disk bit corruption

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cozis
2026-01-24 12:09:28 +01:00
parent 07bc952cb9
commit bf989864a3
1 changed files with 35 additions and 2 deletions
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quakey/src/quakey.c
+35 -2
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@@ -1515,7 +1515,14 @@ static int host_connect(Host *host, int desc_idx,
// TODO: some percent of times connect() should resolve immediately
time_event_connect(host->sim, host->sim->current_time + 100000000, desc);
Nanos latency = 10000000;
#ifdef FAULT_INJECTION
Sim *sim = desc->host->sim;
uint64_t rng = sim_random(sim);
latency = 1000000 + (rng % 99000000); // between 1ms and 100ms
#endif
time_event_connect(host->sim, host->sim->current_time + latency, desc);
desc->connect_addr = addr;
desc->connect_port = port;
@@ -1702,6 +1709,16 @@ static int host_read(Host *host, int desc_idx, char *dst, int len)
int ret = mockfs_read(&desc->file, dst, len);
if (ret < 0)
return mockfs_to_quakey_error(ret);
#ifdef FAULT_INJECTION
if (ret > 0) {
// 1 in 10,000 reads gets a bit flip
if ((sim_random(host->sim) % 10000) == 0) {
int byte_idx = sim_random(host->sim) % ret;
int bit_idx = sim_random(host->sim) % 8;
dst[byte_idx] ^= (1 << bit_idx);
}
}
#endif
num = ret;
} else {
if (desc->type == DESC_DIRECTORY)
@@ -1732,9 +1749,25 @@ static int host_write(Host *host, int desc_idx, char *src, int len)
uint64_t roll = sim_random(host->sim) % 1000;
if (roll == 0) return HOST_ERROR_IO;
if (roll == 1) return HOST_ERROR_NOSPC;
// TODO: inject corruptions
#endif
#ifdef FAULT_INJECTION
int byte_idx = -1;
int bit_idx;
if (len > 0) {
// 1 in 100,000 reads gets a bit flip
if ((sim_random(host->sim) % 100000) == 0) {
byte_idx = sim_random(host->sim) % len;
bit_idx = sim_random(host->sim) % 8;
src[byte_idx] ^= (1 << bit_idx);
}
}
#endif
int ret = mockfs_write(&desc->file, src, len);
#ifdef FAULT_INJECTION
if (byte_idx > -1) {
src[byte_idx] ^= (1 << bit_idx);
}
#endif
if (ret < 0)
return mockfs_to_quakey_error(ret);
num = ret;