tools/testing/selftests/proc/fd-002-posix-eq.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/proc/fd-002-posix-eq.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/proc/fd-002-posix-eq.c
Extension
.c
Size
1629 bytes
Lines
58
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// Test that open(/proc/*/fd/*) opens the same file.
#undef NDEBUG
#include <assert.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

int main(void)
{
	int fd0, fd1, fd2;
	struct stat st0, st1, st2;
	char buf[64];
	int rv;

	fd0 = open("/", O_DIRECTORY|O_RDONLY);
	assert(fd0 >= 0);

	snprintf(buf, sizeof(buf), "/proc/self/fd/%u", fd0);
	fd1 = open(buf, O_RDONLY);
	assert(fd1 >= 0);

	snprintf(buf, sizeof(buf), "/proc/thread-self/fd/%u", fd0);
	fd2 = open(buf, O_RDONLY);
	assert(fd2 >= 0);

	rv = fstat(fd0, &st0);
	assert(rv == 0);
	rv = fstat(fd1, &st1);
	assert(rv == 0);
	rv = fstat(fd2, &st2);
	assert(rv == 0);

	assert(st0.st_dev == st1.st_dev);
	assert(st0.st_ino == st1.st_ino);

	assert(st0.st_dev == st2.st_dev);
	assert(st0.st_ino == st2.st_ino);

	return 0;
}

Annotation

Implementation Notes