The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
NAME kcmp – compare two processes to determine if they share a kernel resource SYNOPSIS #include <linux/kcmp.h> int kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2); Note: There is no glibc wrapper for this system call; see NOTES. DESCRIPTION The kcmp() system call can be used to check whether the two…
NAME afs_syscall, break, fattach, fdetach, ftime, getmsg, getpmsg, gtty, isastream, lock, madvise1, mpx, prof, profil, putmsg, putpmsg, security, stty, tuxcall, ulimit, vserver – unimplemented system calls SYNOPSIS Unimplemented system calls. DESCRIPTION These system calls are not implemented in the Linux kernel. RETURN VALUE These system calls always return -1 and set errno to ENOSYS. NOTES…
NAME ipc – System V IPC system calls SYNOPSIS int ipc(unsigned int call, int first, int second, int third, void *ptr, long fifth); DESCRIPTION ipc() is a common kernel entry point for the System V IPC calls for messages, semaphores, and shared memory. call determines which IPC function to invoke; the other arguments are passed…
NAME ioprio_get, ioprio_set – get/set I/O scheduling class and priority SYNOPSIS int ioprio_get(int which, int who); int ioprio_set(int which, int who, int ioprio); Note: There are no glibc wrappers for these system calls; see NOTES. DESCRIPTION The ioprio_get() and ioprio_set() system calls get and set the I/O scheduling class and priority of one or more…
NAME ioprio_get, ioprio_set – get/set I/O scheduling class and priority SYNOPSIS int ioprio_get(int which, int who); int ioprio_set(int which, int who, int ioprio); Note: There are no glibc wrappers for these system calls; see NOTES. DESCRIPTION The ioprio_get() and ioprio_set() system calls get and set the I/O scheduling class and priority of one or more…
NAME iopl – change I/O privilege level SYNOPSIS #include <sys/io.h> int iopl(int level); DESCRIPTION iopl() changes the I/O privilege level of the calling thread, as specified by the two least significant bits in level. The I/O privilege level for a normal thread is 0. Permissions are inherited from parents to children. This call is deprecated,…
NAME ioperm – set port input/output permissions SYNOPSIS #include <sys/io.h> /* for glibc */ int ioperm(unsigned long from, unsigned long num, int turn_on); DESCRIPTION ioperm() sets the port access permission bits for the calling thread for num bits starting from port address from. If turn_on is nonzero, then permission for the specified bits is enabled;…
NAME ioctl_userfaultfd – create a file descriptor for handling page faults in user space SYNOPSIS #include <sys/ioctl.h> int ioctl(int fd, int cmd, …); DESCRIPTION Various ioctl(2) operations can be performed on a userfaultfd object (created by a call to userfaultfd(2)) using calls of the form: ioctl(fd, cmd, argp); In the above, fd is a file…
NAME ioctl_tty – ioctls for terminals and serial lines SYNOPSIS #include <termios.h> int ioctl(int fd, int cmd, …); DESCRIPTION The ioctl(2) call for terminals and serial ports accepts many possible command arguments. Most require a third argument, of varying type, here called argp or arg. Use of ioctl makes for nonportable programs. Use the POSIX…
NAME ioctl_ns – ioctl() operations for Linux namespaces DESCRIPTION Discovering namespace relationships The following ioctl(2) operations are provided to allow discovery of namespace relationships (see user_namespaces(7) and pid_namespaces(7)). The form of the calls is: new_fd = ioctl(fd, request); In each case, fd refers to a /proc/[pid]/ns/* file. Both operations return a new file descriptor on…
NAME ioctl_list – list of ioctl calls in Linux/i386 kernel DESCRIPTION This 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…
NAME ioctl_iflags – ioctl() operations for inode flags DESCRIPTION Various 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; /*…
NAME 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); DESCRIPTION This 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…
NAME 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]); DESCRIPTION If 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…
NAME 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); DESCRIPTION If 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…
NAME 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); DESCRIPTION If a filesystem supports files sharing physical storage between multiple files ("reflink"), this ioctl(2) operation can be used to make some of…
NAME 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); DESCRIPTION If a filesystem supports files sharing physical storage between multiple files ("reflink"), this ioctl(2) operation can be used to make some of…
NAME 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); DESCRIPTION The ioctl(2) system call can be used to read and…
NAME ioctl_console – ioctls for console terminal and virtual consoles DESCRIPTION The 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…
NAME ioctl – control device SYNOPSIS #include <sys/ioctl.h> int ioctl(int fd, unsigned long request, …); DESCRIPTION The 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…