swap plugin: Drop support for Linux 2.4.

Related: #2955

diff --git a/src/swap.c b/src/swap.c
index db0b987..929df6d 100644 (file)
--- a/src/swap.c
+++ b/src/swap.c
@@ -332,52 +332,31 @@ static int swap_read_combined(void) /* {{{ */
 
 static int swap_read_io(void) /* {{{ */
 {
-  FILE *fh;
   char buffer[1024];
 
-  bool old_kernel = false;
-
   uint8_t have_data = 0;
   derive_t swap_in = 0;
   derive_t swap_out = 0;
 
-  fh = fopen("/proc/vmstat", "r");
+  FILE *fh = fopen("/proc/vmstat", "r");
   if (fh == NULL) {
-    /* /proc/vmstat does not exist in kernels <2.6 */
-    fh = fopen("/proc/stat", "r");
-    if (fh == NULL) {
-      WARNING("swap: fopen: %s", STRERRNO);
-      return -1;
-    } else
-      old_kernel = true;
+    WARNING("swap: fopen(/proc/vmstat): %s", STRERRNO);
+    return -1;
   }
 
   while (fgets(buffer, sizeof(buffer), fh) != NULL) {
     char *fields[8];
-    int numfields;
+    int numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
 
-    numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
+    if (numfields != 2)
+      continue;
 
-    if (!old_kernel) {
-      if (numfields != 2)
-        continue;
-
-      if (strcasecmp("pswpin", fields[0]) == 0) {
-        strtoderive(fields[1], &swap_in);
-        have_data |= 0x01;
-      } else if (strcasecmp("pswpout", fields[0]) == 0) {
-        strtoderive(fields[1], &swap_out);
-        have_data |= 0x02;
-      }
-    } else /* if (old_kernel) */
-    {
-      if (numfields != 3)
-        continue;
-
-      if (strcasecmp("page", fields[0]) == 0) {
-        strtoderive(fields[1], &swap_in);
-        strtoderive(fields[2], &swap_out);
-      }
+    if (strcasecmp("pswpin", fields[0]) == 0) {
+      strtoderive(fields[1], &swap_in);
+      have_data |= 0x01;
+    } else if (strcasecmp("pswpout", fields[0]) == 0) {
+      strtoderive(fields[1], &swap_out);
+      have_data |= 0x02;
     }
   } /* while (fgets) */