tools/testing/selftests/pidfd/pidfd_xattr_test.c
Source file repositories/reference/linux-study-clean/tools/testing/selftests/pidfd/pidfd_xattr_test.c
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/pidfd/pidfd_xattr_test.c- Extension
.c- Size
- 3439 bytes
- Lines
- 133
- Domain
- Support Tooling And Documentation
- Bucket
- tools
- Inferred role
- Support Tooling And Documentation: implementation source
- Status
- source implementation candidate
Why This File Exists
Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Dependency Surface
errno.hfcntl.hlimits.hlinux/types.hpoll.hpthread.hsched.hsignal.hstdio.hstdlib.hstring.hsyscall.hsys/prctl.hsys/wait.hunistd.hsys/socket.hlinux/kcmp.hsys/stat.hsys/xattr.hpidfd.hkselftest_harness.h
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <linux/types.h>
#include <poll.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syscall.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/socket.h>
#include <linux/kcmp.h>
#include <sys/stat.h>
#include <sys/xattr.h>
#include "pidfd.h"
#include "kselftest_harness.h"
FIXTURE(pidfs_xattr)
{
pid_t child_pid;
int child_pidfd;
};
FIXTURE_SETUP(pidfs_xattr)
{
self->child_pid = create_child(&self->child_pidfd, CLONE_NEWUSER | CLONE_NEWPID);
EXPECT_GE(self->child_pid, 0);
if (self->child_pid == 0)
_exit(EXIT_SUCCESS);
}
FIXTURE_TEARDOWN(pidfs_xattr)
{
sys_waitid(P_PID, self->child_pid, NULL, WEXITED);
}
TEST_F(pidfs_xattr, set_get_list_xattr_multiple)
{
int ret, i;
char xattr_name[32];
char xattr_value[32];
char buf[32];
const int num_xattrs = 10;
char list[PATH_MAX] = {};
for (i = 0; i < num_xattrs; i++) {
snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
snprintf(xattr_value, sizeof(xattr_value), "testvalue%d", i);
ret = fsetxattr(self->child_pidfd, xattr_name, xattr_value, strlen(xattr_value), 0);
ASSERT_EQ(ret, 0);
}
for (i = 0; i < num_xattrs; i++) {
snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
snprintf(xattr_value, sizeof(xattr_value), "testvalue%d", i);
memset(buf, 0, sizeof(buf));
ret = fgetxattr(self->child_pidfd, xattr_name, buf, sizeof(buf));
ASSERT_EQ(ret, strlen(xattr_value));
ASSERT_EQ(strcmp(buf, xattr_value), 0);
}
ret = flistxattr(self->child_pidfd, list, sizeof(list));
ASSERT_GT(ret, 0);
for (i = 0; i < num_xattrs; i++) {
snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
bool found = false;
for (char *it = list; it < list + ret; it += strlen(it) + 1) {
if (strcmp(it, xattr_name))
continue;
found = true;
break;
}
ASSERT_TRUE(found);
}
for (i = 0; i < num_xattrs; i++) {
snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
ret = fremovexattr(self->child_pidfd, xattr_name);
ASSERT_EQ(ret, 0);
Annotation
- Immediate include surface: `errno.h`, `fcntl.h`, `limits.h`, `linux/types.h`, `poll.h`, `pthread.h`, `sched.h`, `signal.h`.
- Atlas domain: Support Tooling And Documentation / tools.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.