tools/testing/selftests/proc/proc-multiple-procfs.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/proc/proc-multiple-procfs.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/proc/proc-multiple-procfs.c
Extension
.c
Size
1595 bytes
Lines
49
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

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>

int main(void)
{
	struct stat proc_st1, proc_st2;
	char procbuff[] = "/tmp/proc.XXXXXX/meminfo";
	char procdir1[] = "/tmp/proc.XXXXXX";
	char procdir2[] = "/tmp/proc.XXXXXX";

	assert(mkdtemp(procdir1) != NULL);
	assert(mkdtemp(procdir2) != NULL);

	assert(!mount("proc", procdir1, "proc", 0, "hidepid=1"));
	assert(!mount("proc", procdir2, "proc", 0, "hidepid=2"));

	snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir1);
	assert(!stat(procbuff, &proc_st1));

	snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir2);
	assert(!stat(procbuff, &proc_st2));

	umount(procdir1);
	umount(procdir2);

	assert(proc_st1.st_dev != proc_st2.st_dev);

	return 0;
}

Annotation

Implementation Notes