cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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array.c (3090B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2014, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
      4 */
      5#include "array.h"
      6#include <errno.h>
      7#include <fcntl.h>
      8#include <poll.h>
      9#include <stdlib.h>
     10#include <unistd.h>
     11#include <string.h>
     12
     13void fdarray__init(struct fdarray *fda, int nr_autogrow)
     14{
     15	fda->entries	 = NULL;
     16	fda->priv	 = NULL;
     17	fda->nr		 = fda->nr_alloc = 0;
     18	fda->nr_autogrow = nr_autogrow;
     19}
     20
     21int fdarray__grow(struct fdarray *fda, int nr)
     22{
     23	struct priv *priv;
     24	int nr_alloc = fda->nr_alloc + nr;
     25	size_t psize = sizeof(fda->priv[0]) * nr_alloc;
     26	size_t size  = sizeof(struct pollfd) * nr_alloc;
     27	struct pollfd *entries = realloc(fda->entries, size);
     28
     29	if (entries == NULL)
     30		return -ENOMEM;
     31
     32	priv = realloc(fda->priv, psize);
     33	if (priv == NULL) {
     34		free(entries);
     35		return -ENOMEM;
     36	}
     37
     38	memset(&entries[fda->nr_alloc], 0, sizeof(struct pollfd) * nr);
     39	memset(&priv[fda->nr_alloc], 0, sizeof(fda->priv[0]) * nr);
     40
     41	fda->nr_alloc = nr_alloc;
     42	fda->entries  = entries;
     43	fda->priv     = priv;
     44	return 0;
     45}
     46
     47struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow)
     48{
     49	struct fdarray *fda = calloc(1, sizeof(*fda));
     50
     51	if (fda != NULL) {
     52		if (fdarray__grow(fda, nr_alloc)) {
     53			free(fda);
     54			fda = NULL;
     55		} else {
     56			fda->nr_autogrow = nr_autogrow;
     57		}
     58	}
     59
     60	return fda;
     61}
     62
     63void fdarray__exit(struct fdarray *fda)
     64{
     65	free(fda->entries);
     66	free(fda->priv);
     67	fdarray__init(fda, 0);
     68}
     69
     70void fdarray__delete(struct fdarray *fda)
     71{
     72	fdarray__exit(fda);
     73	free(fda);
     74}
     75
     76int fdarray__add(struct fdarray *fda, int fd, short revents, enum fdarray_flags flags)
     77{
     78	int pos = fda->nr;
     79
     80	if (fda->nr == fda->nr_alloc &&
     81	    fdarray__grow(fda, fda->nr_autogrow) < 0)
     82		return -ENOMEM;
     83
     84	fda->entries[fda->nr].fd     = fd;
     85	fda->entries[fda->nr].events = revents;
     86	fda->priv[fda->nr].flags = flags;
     87	fda->nr++;
     88	return pos;
     89}
     90
     91int fdarray__dup_entry_from(struct fdarray *fda, int pos, struct fdarray *from)
     92{
     93	struct pollfd *entry;
     94	int npos;
     95
     96	if (pos >= from->nr)
     97		return -EINVAL;
     98
     99	entry = &from->entries[pos];
    100
    101	npos = fdarray__add(fda, entry->fd, entry->events, from->priv[pos].flags);
    102	if (npos >= 0)
    103		fda->priv[npos] = from->priv[pos];
    104
    105	return npos;
    106}
    107
    108int fdarray__filter(struct fdarray *fda, short revents,
    109		    void (*entry_destructor)(struct fdarray *fda, int fd, void *arg),
    110		    void *arg)
    111{
    112	int fd, nr = 0;
    113
    114	if (fda->nr == 0)
    115		return 0;
    116
    117	for (fd = 0; fd < fda->nr; ++fd) {
    118		if (!fda->entries[fd].events)
    119			continue;
    120
    121		if (fda->entries[fd].revents & revents) {
    122			if (entry_destructor)
    123				entry_destructor(fda, fd, arg);
    124
    125			fda->entries[fd].revents = fda->entries[fd].events = 0;
    126			continue;
    127		}
    128
    129		if (!(fda->priv[fd].flags & fdarray_flag__nonfilterable))
    130			++nr;
    131	}
    132
    133	return nr;
    134}
    135
    136int fdarray__poll(struct fdarray *fda, int timeout)
    137{
    138	return poll(fda->entries, fda->nr, timeout);
    139}
    140
    141int fdarray__fprintf(struct fdarray *fda, FILE *fp)
    142{
    143	int fd, printed = fprintf(fp, "%d [ ", fda->nr);
    144
    145	for (fd = 0; fd < fda->nr; ++fd)
    146		printed += fprintf(fp, "%s%d", fd ? ", " : "", fda->entries[fd].fd);
    147
    148	return printed + fprintf(fp, " ]");
    149}