2171a92568
We will use this in perf's evlist class so that it can, at
fdarray__filter() time, to unmap the associated ring buffer.
We may need to have further info associated with each fdarray entry, in
that case we'll make that int array a 'union fdarray_priv' one and put a
pointer there so that users can stash whatever they want there. For now,
an int is enough tho.
v2: Add clarification to the per array entry priv area, as well as make
it a union, which makes usage a bit longer, but if/when we make it
use more space by allowing per entry pointers existing users source
code will not have to be changed, just rebuilt.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lkml.kernel.org/n/tip-0p00bn83quck3fio3kcs9vca@git.kernel.org
127 lines
2.4 KiB
C
127 lines
2.4 KiB
C
/*
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* Copyright (C) 2014, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
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*
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* Released under the GPL v2. (and only v2, not any later version)
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*/
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#include "array.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <stdlib.h>
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#include <unistd.h>
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void fdarray__init(struct fdarray *fda, int nr_autogrow)
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{
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fda->entries = NULL;
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fda->priv = NULL;
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fda->nr = fda->nr_alloc = 0;
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fda->nr_autogrow = nr_autogrow;
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}
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int fdarray__grow(struct fdarray *fda, int nr)
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{
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void *priv;
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int nr_alloc = fda->nr_alloc + nr;
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size_t psize = sizeof(fda->priv[0]) * nr_alloc;
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size_t size = sizeof(struct pollfd) * nr_alloc;
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struct pollfd *entries = realloc(fda->entries, size);
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if (entries == NULL)
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return -ENOMEM;
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priv = realloc(fda->priv, psize);
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if (priv == NULL) {
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free(entries);
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return -ENOMEM;
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}
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fda->nr_alloc = nr_alloc;
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fda->entries = entries;
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fda->priv = priv;
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return 0;
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}
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struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow)
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{
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struct fdarray *fda = calloc(1, sizeof(*fda));
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if (fda != NULL) {
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if (fdarray__grow(fda, nr_alloc)) {
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free(fda);
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fda = NULL;
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} else {
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fda->nr_autogrow = nr_autogrow;
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}
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}
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return fda;
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}
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void fdarray__exit(struct fdarray *fda)
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{
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free(fda->entries);
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free(fda->priv);
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fdarray__init(fda, 0);
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}
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void fdarray__delete(struct fdarray *fda)
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{
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fdarray__exit(fda);
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free(fda);
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}
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int fdarray__add(struct fdarray *fda, int fd, short revents)
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{
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int pos = fda->nr;
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if (fda->nr == fda->nr_alloc &&
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fdarray__grow(fda, fda->nr_autogrow) < 0)
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return -ENOMEM;
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fda->entries[fda->nr].fd = fd;
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fda->entries[fda->nr].events = revents;
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fda->nr++;
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return pos;
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}
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int fdarray__filter(struct fdarray *fda, short revents,
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void (*entry_destructor)(struct fdarray *fda, int fd))
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{
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int fd, nr = 0;
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if (fda->nr == 0)
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return 0;
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for (fd = 0; fd < fda->nr; ++fd) {
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if (fda->entries[fd].revents & revents) {
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if (entry_destructor)
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entry_destructor(fda, fd);
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continue;
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}
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if (fd != nr) {
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fda->entries[nr] = fda->entries[fd];
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fda->priv[nr] = fda->priv[fd];
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}
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++nr;
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}
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return fda->nr = nr;
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}
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int fdarray__poll(struct fdarray *fda, int timeout)
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{
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return poll(fda->entries, fda->nr, timeout);
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}
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int fdarray__fprintf(struct fdarray *fda, FILE *fp)
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{
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int fd, printed = fprintf(fp, "%d [ ", fda->nr);
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for (fd = 0; fd < fda->nr; ++fd)
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printed += fprintf(fp, "%s%d", fd ? ", " : "", fda->entries[fd].fd);
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return printed + fprintf(fp, " ]");
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}
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