Linux Manuals session 2

ioctl_list – list of ioctl calls in Linux/i386 kernel DescriptionThis is Ioctl List 1.3.27, a list of ioctl calls in Linux/i386 kernel 1.3.27. It contains 421 ioctls from </usr/include/{asm,linux}/*.h>. For each ioctl, its numerical value, its name, and its argument type are given. An argument type of const struct foo * means the argument is input…

ioctl_iflags – ioctl() operations for inode flags DescriptionVarious Linux filesystems support the notion of inode flags—attributes that modify the semantics of files and directories. These flags can be retrieved and modified using two ioctl(2) operations: int attr; fd = open("pathname", …); ioctl(fd, FS_IOC_GETFLAGS, &attr); /* Place current flags                                        in ‘attr’ */ attr |= FS_NOATIME_FL; /* Tweak returned…

ioctl_getfsmap – retrieve the physical layout of the filesystem Synopsis#include <sys/ioctl.h> #include <linux/fs.h> #include <linux/fsmap.h> int ioctl(int fd, FS_IOC_GETFSMAP, struct fsmap_head * arg); DescriptionThis ioctl(2) operation retrieves physical extent mappings for a filesystem. This information can be used to discover which files are mapped to a physical block, examine free space, or find known bad…

ioctl_fslabel – get or set a filesystem label Synopsis#include <sys/ioctl.h> #include <linux/fs.h> int ioctl(int fd, FS_IOC_GETFSLABEL, char label[FSLABEL_MAX]); int ioctl(int fd, FS_IOC_SETFSLABEL, char label[FSLABEL_MAX]); DescriptionIf a filesystem supports online label manipulation, these ioctl(2) operations can be used to get or set the filesystem label for the filesystem on which fd resides. The FS_IOC_SETFSLABEL operation requires…

ioctl_fideduperange – share some the data of one file with another file Synopsis#include <sys/ioctl.h> #include <linux/fs.h> int ioctl(int src_fd, FIDEDUPERANGE, struct file_dedupe_range *arg); DescriptionIf a filesystem supports files sharing physical storage between multiple files, this ioctl(2) operation can be used to make some of the data in the src_fd file appear in the dest_fd file…

ioctl_ficlonerange, ioctl_ficlone – share some the data of one file with another file Synopsis#include <sys/ioctl.h> #include <linux/fs.h> int ioctl(int dest_fd, FICLONERANGE, struct file_clone_range *arg); int ioctl(int dest_fd, FICLONE, int src_fd); DescriptionIf a filesystem supports files sharing physical storage between multiple files ("reflink"), this ioctl(2) operation can be used to make some of the data in…

ioctl_ficlonerange, ioctl_ficlone – share some the data of one file with another file Synopsis#include <sys/ioctl.h> #include <linux/fs.h> int ioctl(int dest_fd, FICLONERANGE, struct file_clone_range *arg); int ioctl(int dest_fd, FICLONE, int src_fd); DescriptionIf a filesystem supports files sharing physical storage between multiple files ("reflink"), this ioctl(2) operation can be used to make some of the data in…

ioctl_fat – manipulating the FAT filesystem Synopsis#include <linux/msdos_fs.h> #include <sys/ioctl.h> int ioctl(int fd, FAT_IOCTL_GET_ATTRIBUTES, uint32_t *attr); int ioctl(int fd, FAT_IOCTL_SET_ATTRIBUTES, uint32_t *attr); int ioctl(int fd, FAT_IOCTL_GET_VOLUME_ID, uint32_t *id); int ioctl(int fd, VFAT_IOCTL_READDIR_BOTH, struct __fat_dirent[2] entry); int ioctl(int fd, VFAT_IOCTL_READDIR_SHORT, struct __fat_dirent[2] entry);DescriptionThe ioctl(2) system call can be used to read and write metadata of FAT…

ioctl_console – ioctls for console terminal and virtual consoles DescriptionThe following Linux-specific ioctl(2) requests are supported for console terminals and virtual consoles. Each requires a third argument, assumed here to be argp. KDGETLED Get state of LEDs. argp points to a char. The lower three bits of *argp are set to the state of the…

ioctl – control device Synopsis#include <sys/ioctl.h> int ioctl(int fd, unsigned long request, …); DescriptionThe ioctl() system call manipulates the underlying device parameters of special files. In particular, many operating characteristics of character special files (e.g., terminals) may be controlled with ioctl() requests. The argument fd must be an open file descriptor. The second argument is…

io_submit – submit asynchronous I/O blocks for processing Synopsis#include <linux/aio_abi.h> /* Defines needed types */ int io_submit(aio_context_t ctx_id, long nr, struct iocb **iocbpp);Note: There is no glibc wrapper for this system call; see NOTES. DescriptionNote: this page describes the raw Linux system call interface. The wrapper function provided by libaio uses a different type for…

io_setup – create an asynchronous I/O context Synopsis#include <linux/aio_abi.h> /* Defines needed types */ long io_setup(unsigned nr_events, aio_context_t *ctx_idp);Note: There is no glibc wrapper for this system call; see NOTES. DescriptionNote: this page describes the raw Linux system call interface. The wrapper function provided by libaio uses a different type for the ctx_idp argument. See…

io_getevents – read asynchronous I/O events from the completion queue Synopsis#include <linux/aio_abi.h> /* Defines needed types */ #include <linux/time.h> /* Defines ‘struct timespec’ */ int io_getevents(aio_context_t ctx_id, long min_nr, long nr, struct io_event *events, struct timespec *timeout);Note: There is no glibc wrapper for this system call; see NOTES. DescriptionNote: this page describes the raw Linux…

io_destroy – destroy an asynchronous I/O context Synopsis#include <linux/aio_abi.h> /* Defines needed types */ int io_destroy(aio_context_t ctx_id);Note: There is no glibc wrapper for this system call; see NOTES. DescriptionNote: this page describes the raw Linux system call interface. The wrapper function provided by libaio uses a different type for the ctx_id argument. See NOTES. The…

io_cancel – cancel an outstanding asynchronous I/O operation Synopsis#include <linux/aio_abi.h> /* Defines needed types */ int io_cancel(aio_context_t ctx_id, struct iocb *iocb, struct io_event *result);Note: There is no glibc wrapper for this system call; see NOTES. DescriptionNote: this page describes the raw Linux system call interface. The wrapper function provided by libaio uses a different type…

outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…

outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…

intro – introduction to system calls DescriptionSection 2 of the manual describes the Linux system calls. A system call is an entry point into the Linux kernel. Usually, system calls are not invoked directly: instead, most system calls have corresponding C library wrapper functions which perform the steps required (e.g., trapping to kernel mode) in…

outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…

outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…