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Swap (Linux): use /proc/swaps

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Preparing for detailed swap usage
This commit is contained in:
Carter Li
2025-06-04 10:37:07 +08:00
parent d7a8c92b46
commit 4c34f99c12
1 changed files with 17 additions and 11 deletions
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src/detection/swap/swap_linux.c
+17 -11
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@@ -9,22 +9,28 @@ const char* ffDetectSwap(FFSwapResult* swap)
{
// Ref: #620
char buf[PROC_FILE_BUFFSIZ];
ssize_t nRead = ffReadFileData("/proc/meminfo", ARRAY_SIZE(buf) - 1, buf);
if(nRead < 0)
return "ffReadFileData(\"/proc/meminfo\", ARRAY_SIZE(buf)-1, buf)";
ssize_t nRead = ffReadFileData("/proc/swaps", ARRAY_SIZE(buf) - 1, buf);
if(nRead <= 0)
return "ffReadFileData(\"/proc/swaps\", ARRAY_SIZE(buf)-1, buf) failed";
buf[nRead] = '\0';
uint64_t swapTotal = 0, swapFree = 0;
// Skip header
char* line = memchr(buf, '\n', (size_t) nRead);
char *token = NULL;
if ((token = strstr(buf, "SwapTotal:")) != NULL)
swapTotal = strtoul(token + strlen("SwapTotal:"), NULL, 10);
while(line && *++line)
{
uint64_t total, used;
if(sscanf(line, "%*[^\t]%" SCNu64 "%" SCNu64, &total, &used) != 2)
return "Invalid /proc/swaps format found";
if ((token = strstr(buf, "SwapFree:")) != NULL)
swapFree = strtoul(token + strlen("SwapFree:"), NULL, 10);
swap->bytesTotal += total;
swap->bytesUsed += used;
swap->bytesTotal = swapTotal * 1024lu;
swap->bytesUsed = (swapTotal - swapFree) * 1024lu;
line = memchr(line, '\n', (size_t) (nRead - (line - buf)));
}
swap->bytesTotal *= 1024u;
swap->bytesUsed *= 1024u;
return NULL;
}