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Fix division by zero when calculating IO rates 

Fixes #935
This commit is contained in:
Benny Baumann 2022-02-03 17:48:18 +01:00
parent 3e1a27a981
commit 265a7b8a50
1 changed files with 4 additions and 2 deletions
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6
linux/LinuxProcessList.c
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@ -493,6 +493,8 @@ static void LinuxProcessList_readIoFile(LinuxProcess* process, openat_arg_t proc
unsigned long long last_read = process->io_read_bytes;
unsigned long long last_write = process->io_write_bytes;
unsigned long long time_delta = realtimeMs > process->io_last_scan_time_ms ? realtimeMs - process->io_last_scan_time_ms : 0;
char* buf = buffer;
const char* line;
while ((line = strsep(&buf, "\n")) != NULL) {
@ -502,7 +504,7 @@ static void LinuxProcessList_readIoFile(LinuxProcess* process, openat_arg_t proc
process->io_rchar = strtoull(line + 7, NULL, 10);
} else if (String_startsWith(line + 1, "ead_bytes: ")) {
process->io_read_bytes = strtoull(line + 12, NULL, 10);
process->io_rate_read_bps = (process->io_read_bytes - last_read) * /*ms to s*/1000 / (realtimeMs - process->io_last_scan_time_ms);
process->io_rate_read_bps = time_delta ? (process->io_read_bytes - last_read) * /*ms to s*/1000. / time_delta : NAN;
}
break;
case 'w':
@ -510,7 +512,7 @@ static void LinuxProcessList_readIoFile(LinuxProcess* process, openat_arg_t proc
process->io_wchar = strtoull(line + 7, NULL, 10);
} else if (String_startsWith(line + 1, "rite_bytes: ")) {
process->io_write_bytes = strtoull(line + 13, NULL, 10);
process->io_rate_write_bps = (process->io_write_bytes - last_write) * /*ms to s*/1000 / (realtimeMs - process->io_last_scan_time_ms);
process->io_rate_write_bps = time_delta ? (process->io_write_bytes - last_write) * /*ms to s*/1000. / time_delta : NAN;
}
break;
case 's':