include/uapi/linux/posix_types.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/posix_types.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/posix_types.h
Extension
.h
Size
1098 bytes
Lines
39
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _LINUX_POSIX_TYPES_H
#define _LINUX_POSIX_TYPES_H

#include <linux/stddef.h>

/*
 * This allows for 1024 file descriptors: if NR_OPEN is ever grown
 * beyond that you'll have to change this too. But 1024 fd's seem to be
 * enough even for such "real" unices like OSF/1, so hopefully this is
 * one limit that doesn't have to be changed [again].
 *
 * Note that POSIX wants the FD_CLEAR(fd,fdsetp) defines to be in
 * <sys/time.h> (and thus <linux/time.h>) - but this is a more logical
 * place for them. Solved by having dummy defines in <sys/time.h>.
 */

/*
 * This macro may have been defined in <gnu/types.h>. But we always
 * use the one here.
 */
#undef __FD_SETSIZE
#define __FD_SETSIZE	1024

typedef struct {
	unsigned long fds_bits[__FD_SETSIZE / (8 * sizeof(long))];
} __kernel_fd_set;

/* Type of a signal handler.  */
typedef void (*__kernel_sighandler_t)(int);

/* Type of a SYSV IPC key.  */
typedef int __kernel_key_t;
typedef int __kernel_mqd_t;

#include <asm/posix_types.h>

#endif /* _LINUX_POSIX_TYPES_H */

Annotation

Implementation Notes