diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
---|---|---|
committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /tools/lib/api/fd/array.c |
Initial import
Diffstat (limited to 'tools/lib/api/fd/array.c')
-rw-r--r-- | tools/lib/api/fd/array.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/tools/lib/api/fd/array.c b/tools/lib/api/fd/array.c new file mode 100644 index 000000000..0e636c433 --- /dev/null +++ b/tools/lib/api/fd/array.c @@ -0,0 +1,127 @@ +/* + * 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->priv = NULL; + fda->nr = fda->nr_alloc = 0; + fda->nr_autogrow = nr_autogrow; +} + +int fdarray__grow(struct fdarray *fda, int nr) +{ + void *priv; + int nr_alloc = fda->nr_alloc + nr; + size_t psize = sizeof(fda->priv[0]) * nr_alloc; + size_t size = sizeof(struct pollfd) * nr_alloc; + struct pollfd *entries = realloc(fda->entries, size); + + if (entries == NULL) + return -ENOMEM; + + priv = realloc(fda->priv, psize); + if (priv == NULL) { + free(entries); + return -ENOMEM; + } + + fda->nr_alloc = nr_alloc; + fda->entries = entries; + fda->priv = priv; + 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); + free(fda->priv); + 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) +{ + int pos = fda->nr; + + 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 pos; +} + +int fdarray__filter(struct fdarray *fda, short revents, + void (*entry_destructor)(struct fdarray *fda, int fd)) +{ + int fd, nr = 0; + + if (fda->nr == 0) + return 0; + + for (fd = 0; fd < fda->nr; ++fd) { + if (fda->entries[fd].revents & revents) { + if (entry_destructor) + entry_destructor(fda, fd); + + continue; + } + + if (fd != nr) { + fda->entries[nr] = fda->entries[fd]; + fda->priv[nr] = fda->priv[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, " ]"); +} |