1 files changed, 82 insertions, 0 deletions
diff --git a/src/detection/swap/swap_linux.c b/src/detection/swap/swap_linux.c
new file mode 100644
index 0000000..b31f268
--- /dev/null
+++ b/src/detection/swap/swap_linux.c
@@ -0,0 +1,82 @@
+#include "swap.h"
+
+#include "common/io.h"
+#include "common/mallocHelper.h"
+
+#include <inttypes.h>
+
+static const char* detectByProcMeminfo(FFlist* result) {
+    // For Android
+    // 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)";
+    }
+    buf[nRead] = '\0';
+
+    uint64_t swapTotal = 0, swapFree = 0;
+
+    char* token = NULL;
+    if ((token = strstr(buf, "SwapTotal:")) != NULL) {
+        swapTotal = strtoul(token + strlen("SwapTotal:"), NULL, 10);
+    }
+
+    if ((token = strstr(buf, "SwapFree:")) != NULL) {
+        swapFree = strtoul(token + strlen("SwapFree:"), NULL, 10);
+    }
+
+    FFSwapResult* swap = FF_LIST_ADD(FFSwapResult, *result);
+    ffStrbufInitStatic(&swap->name, "Total");
+    swap->bytesTotal = swapTotal * 1024lu;
+    swap->bytesUsed = (swapTotal - swapFree) * 1024lu;
+
+    return NULL;
+}
+
+static const char* detectByProcSwaps(FFlist* result) {
+    // Ref: #620
+    char buf[PROC_FILE_BUFFSIZ];
+    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';
+
+    // Skip header
+    char* line = memchr(buf, '\n', (size_t) nRead);
+
+    while (line && *++line) {
+        uint64_t total, used;
+        char name[256];
+        if (sscanf(line, "%255s %*[^\t]%" SCNu64 "%" SCNu64, name, &total, &used) != 3) {
+            return "Invalid /proc/swaps format found";
+        }
+
+        uint32_t nameLen = (uint32_t) strnlen(name, sizeof(name));
+        FFSwapResult* swap = FF_LIST_ADD(FFSwapResult, *result);
+        ffStrbufInitA(&swap->name, nameLen);
+        for (size_t i = 0; i < nameLen; ++i) {
+            if (name[i] == '\\') {
+                char octal[4] = { name[i + 1], name[i + 2], name[i + 3], '\0' };
+                ffStrbufAppendC(&swap->name, (char) strtol(octal, NULL, 8));
+                i += 3;
+            } else {
+                ffStrbufAppendC(&swap->name, name[i]);
+            }
+        }
+        swap->bytesTotal = total * 1024u;
+        swap->bytesUsed = used * 1024u;
+
+        line = memchr(line, '\n', (size_t) (nRead - (line - buf)));
+    }
+
+    return NULL;
+}
+
+const char* ffDetectSwap(FFlist* result) {
+    if (detectByProcSwaps(result) == NULL) {
+        return NULL;
+    }
+    return detectByProcMeminfo(result);
+}