tools/include/nolibc/sys/mman.h

Source file repositories/reference/linux-study-clean/tools/include/nolibc/sys/mman.h

File Facts

System
Linux kernel
Corpus path
tools/include/nolibc/sys/mman.h
Extension
.h
Size
1774 bytes
Lines
78
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 "../nolibc.h"

#ifndef _NOLIBC_SYS_MMAN_H
#define _NOLIBC_SYS_MMAN_H

#include "../arch.h"
#include "../sys.h"

#ifndef _sys_mmap
static __attribute__((unused))
void *_sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
		off_t offset)
{
	int n;

#if defined(__NR_mmap2)
	n = __NR_mmap2;
	offset >>= 12;
#else
	n = __NR_mmap;
#endif

	return (void *)(unsigned long)__nolibc_syscall6(n, addr, length, prot, flags, fd, offset);
}
#endif

static __attribute__((unused))
void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
{
	void *ret = _sys_mmap(addr, length, prot, flags, fd, offset);

	if ((unsigned long)ret >= -4095UL) {
		SET_ERRNO(-(long)ret);
		ret = MAP_FAILED;
	}
	return ret;
}

static __attribute__((unused))
void *_sys_mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
{
	return (void *)(unsigned long)__nolibc_syscall5(__NR_mremap, old_address, old_size,
							new_size, flags, new_address);
}

static __attribute__((unused))
void *mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
{
	void *ret = _sys_mremap(old_address, old_size, new_size, flags, new_address);

	if ((unsigned long)ret >= -4095UL) {
		SET_ERRNO(-(long)ret);
		ret = MAP_FAILED;
	}
	return ret;
}

static __attribute__((unused))
int _sys_munmap(void *addr, size_t length)
{
	return __nolibc_syscall2(__NR_munmap, addr, length);
}

static __attribute__((unused))
int munmap(void *addr, size_t length)
{
	return __sysret(_sys_munmap(addr, length));
}

#endif /* _NOLIBC_SYS_MMAN_H */

Annotation

Implementation Notes