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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) International Business Machines Corp., 2002
* Ported by Paul Larson
* Copyright (c) 2013 Cyril Hrubis <chrubis@suse.cz>
* Copyright (c) 2023 SUSE LLC Avinesh Kumar <avinesh.kumar@suse.com>
*/
/*\
* [Description]
*
* Verify that, pipe(2) syscall can open the maximum number of
* file descriptors permitted.
*/
#include "tst_test.h"
#include <stdlib.h>
static int *opened_fds, *pipe_fds;
static int num_pipe_fds, exp_num_pipes;
static int record_open_fds(void)
{
DIR *dir;
struct dirent *ent;
int fd;
int num_opened_fds = 0;
int arr_size = 0;
dir = SAFE_OPENDIR("/proc/self/fd");
while ((ent = SAFE_READDIR(dir))) {
if (!strcmp(ent->d_name, ".") ||
!strcmp(ent->d_name, ".."))
continue;
fd = atoi(ent->d_name);
if (fd == dirfd(dir))
continue;
if (num_opened_fds >= arr_size) {
arr_size = MAX(1, arr_size * 2);
opened_fds = SAFE_REALLOC(opened_fds, arr_size * sizeof(int));
}
opened_fds[num_opened_fds++] = fd;
}
SAFE_CLOSEDIR(dir);
return num_opened_fds;
}
static void setup(void)
{
int max_fds;
max_fds = getdtablesize();
tst_res(TINFO, "getdtablesize() = %d", max_fds);
pipe_fds = SAFE_MALLOC(max_fds * sizeof(int));
exp_num_pipes = (max_fds - record_open_fds()) / 2 * 2;
tst_res(TINFO, "expected max fds to be opened by pipe(): %d", exp_num_pipes);
}
static void run(void)
{
int fds[2];
do {
TEST(pipe(fds));
if (!TST_RET) {
pipe_fds[num_pipe_fds++] = fds[0];
pipe_fds[num_pipe_fds++] = fds[1];
}
} while (!TST_RET);
TST_EXP_EQ_LI(errno, EMFILE);
TST_EXP_EQ_LI(exp_num_pipes, num_pipe_fds);
for (int i = 0; i < num_pipe_fds; i++)
SAFE_CLOSE(pipe_fds[i]);
num_pipe_fds = 0;
}
static void cleanup(void)
{
for (int i = 0; i < num_pipe_fds; i++)
if (pipe_fds[i] > 0)
SAFE_CLOSE(pipe_fds[i]);
if (pipe_fds)
free(pipe_fds);
if (opened_fds)
free(opened_fds);
}
static struct tst_test test = {
.setup = setup,
.cleanup = cleanup,
.test_all = run
};
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