1 files changed, 107 insertions, 0 deletions

diff --git a/tools/lib/api/fd/array.c b/tools/lib/api/fd/array.c
new file mode 100644
index 000000000000..4889c7d42961
--- /dev/null
+++ b/tools/lib/api/fd/array.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2014, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
+ *
+ * Released under the GPL v2. (and only v2, not any later version)
+ */
+#include "array.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void fdarray__init(struct fdarray *fda, int nr_autogrow)
+{
+        fda->entries     = NULL;
+        fda->nr          = fda->nr_alloc = 0;
+        fda->nr_autogrow = nr_autogrow;
+}
+
+int fdarray__grow(struct fdarray *fda, int nr)
+{
+        int nr_alloc = fda->nr_alloc + nr;
+        size_t size  = sizeof(struct pollfd) * nr_alloc;
+        struct pollfd *entries = realloc(fda->entries, size);
+
+        if (entries == NULL)
+                return -ENOMEM;
+
+        fda->nr_alloc = nr_alloc;
+        fda->entries  = entries;
+        return 0;
+}
+
+struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow)
+{
+        struct fdarray *fda = calloc(1, sizeof(*fda));
+
+        if (fda != NULL) {
+                if (fdarray__grow(fda, nr_alloc)) {
+                        free(fda);
+                        fda = NULL;
+                } else {
+                        fda->nr_autogrow = nr_autogrow;
+                }
+        }
+
+        return fda;
+}
+
+void fdarray__exit(struct fdarray *fda)
+{
+        free(fda->entries);
+        fdarray__init(fda, 0);
+}
+
+void fdarray__delete(struct fdarray *fda)
+{
+        fdarray__exit(fda);
+        free(fda);
+}
+
+int fdarray__add(struct fdarray *fda, int fd, short revents)
+{
+        if (fda->nr == fda->nr_alloc &&
+            fdarray__grow(fda, fda->nr_autogrow) < 0)
+                return -ENOMEM;
+
+        fda->entries[fda->nr].fd     = fd;
+        fda->entries[fda->nr].events = revents;
+        fda->nr++;
+        return 0;
+}
+
+int fdarray__filter(struct fdarray *fda, short revents)
+{
+        int fd, nr = 0;
+
+        if (fda->nr == 0)
+                return 0;
+
+        for (fd = 0; fd < fda->nr; ++fd) {
+                if (fda->entries[fd].revents & revents)
+                        continue;
+
+                if (fd != nr)
+                        fda->entries[nr] = fda->entries[fd];
+
+                ++nr;
+        }
+
+        return fda->nr = nr;
+}
+
+int fdarray__poll(struct fdarray *fda, int timeout)
+{
+        return poll(fda->entries, fda->nr, timeout);
+}
+
+int fdarray__fprintf(struct fdarray *fda, FILE *fp)
+{
+        int fd, printed = fprintf(fp, "%d [ ", fda->nr);
+
+        for (fd = 0; fd < fda->nr; ++fd)
+                printed += fprintf(fp, "%s%d", fd ? ", " : "", fda->entries[fd].fd);
+
+        return printed + fprintf(fp, " ]");
+}