[lttng-modules.git] / src / wrapper / fdtable.c

/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
 * wrapper/fdtable.c
 *
 * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include <linux/version.h>
#include <linux/spinlock.h>
#include <wrapper/fdtable.h>

#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0))

/*
 * Reimplementation of iterate_fd() for kernels between 2.6.32 and 3.6
 * (inclusive).
 */
int lttng_iterate_fd(struct files_struct *files,
		unsigned int first,
		int (*cb)(const void *, struct file *, unsigned int),
		const void *ctx)
{
	struct fdtable *fdt;
	struct file *filp;
	unsigned int i;
	int res = 0;

	if (!files)
		return 0;
	spin_lock(&files->file_lock);
	fdt = files_fdtable(files);
	for (i = 0; i < fdt->max_fds; i++) {
		filp = fcheck_files(files, i);
		if (!filp)
			continue;
		res = cb(ctx, filp, i);
		if (res)
			break;
	}
	spin_unlock(&files->file_lock);
	return res;
}

#endif
Commit	Line	Data
	1	/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
	2	* wrapper/fdtable.c
	3	*
	4	* Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	5	*/
	6
	7	#include <linux/version.h>
	8	#include <linux/spinlock.h>
	9	#include <wrapper/fdtable.h>
	10
	11	#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0))
	12
	13	/*
	14	* Reimplementation of iterate_fd() for kernels between 2.6.32 and 3.6
	15	* (inclusive).
	16	*/
	17	int lttng_iterate_fd(struct files_struct *files,
	18	unsigned int first,
	19	int (cb)(const void , struct file *, unsigned int),
	20	const void *ctx)
	21	{
	22	struct fdtable *fdt;
	23	struct file *filp;
	24	unsigned int i;
	25	int res = 0;
	26
	27	if (!files)
	28	return 0;
	29	spin_lock(&files->file_lock);
	30	fdt = files_fdtable(files);
	31	for (i = 0; i < fdt->max_fds; i++) {
	32	filp = fcheck_files(files, i);
	33	if (!filp)
	34	continue;
	35	res = cb(ctx, filp, i);
	36	if (res)
	37	break;
	38	}
	39	spin_unlock(&files->file_lock);
	40	return res;
	41	}
	42
	43	#endif