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 spu_create – create a new spu context SYNOPSIS #include <sys/spu.h> #include <sys/types.h> int spu_create(const char *pathname, int flags, mode_t mode, int neighbor_fd); Note: There is no glibc wrapper for this system call; see NOTES. DESCRIPTION The spu_create() system call is used on PowerPC machines that implement the Cell Broadband Engine Architecture in order to…
NAME splice – splice data to/from a pipe SYNOPSIS #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <fcntl.h> ssize_t splice(int fd_in, loff_t *off_in, int fd_out, loff_t *off_out, size_t len, unsigned int flags); DESCRIPTION splice() moves data between two file descriptors without copying between kernel address space and user address space. It transfers up to len bytes…
NAME socketpair – create a pair of connected sockets SYNOPSIS #include <sys/types.h> /* See NOTES */ #include <sys/socket.h> int socketpair(int domain, int type, int protocol, int sv[2]); DESCRIPTION The socketpair() call creates an unnamed pair of connected sockets in the specified domain, of the specified type, and using the optionally specified protocol. For further details…
NAME socketcall – socket system calls SYNOPSIS #include <linux/net.h> int socketcall(int call, unsigned long *args); DESCRIPTION socketcall() is a common kernel entry point for the socket system calls. call determines which socket function to invoke. args points to a block containing the actual arguments, which are passed through to the appropriate call. User programs should…
NAME sigwaitinfo, sigtimedwait, rt_sigtimedwait – synchronously wait for queued signals SYNOPSIS #include <signal.h> int sigwaitinfo(const sigset_t *set, siginfo_t *info); int sigtimedwait(const sigset_t *set, siginfo_t *info, const struct timespec *timeout); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigwaitinfo(), sigtimedwait(): _POSIX_C_SOURCE >= 199309L DESCRIPTION sigwaitinfo() suspends execution of the calling thread until one of the signals in set…
NAME sigwaitinfo, sigtimedwait, rt_sigtimedwait – synchronously wait for queued signals SYNOPSIS #include <signal.h> int sigwaitinfo(const sigset_t *set, siginfo_t *info); int sigtimedwait(const sigset_t *set, siginfo_t *info, const struct timespec *timeout); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigwaitinfo(), sigtimedwait(): _POSIX_C_SOURCE >= 199309L DESCRIPTION sigwaitinfo() suspends execution of the calling thread until one of the signals in set…
NAME sigsuspend, rt_sigsuspend – wait for a signal SYNOPSIS #include <signal.h> int sigsuspend(const sigset_t *mask); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigsuspend(): _POSIX_C_SOURCE DESCRIPTION sigsuspend() temporarily replaces the signal mask of the calling thread with the mask given by mask and then suspends the thread until delivery of a signal whose action is…
NAME sigreturn, rt_sigreturn – return from signal handler and cleanup stack frame SYNOPSIS int sigreturn(…); DESCRIPTION If the Linux kernel determines that an unblocked signal is pending for a process, then, at the next transition back to user mode in that process (e.g., upon return from a system call or when the process is rescheduled…
NAME sigqueue – queue a signal and data to a process SYNOPSIS #include <signal.h> int sigqueue(pid_t pid, int sig, const union sigval value); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigqueue(): _POSIX_C_SOURCE >= 199309L DESCRIPTION sigqueue() sends the signal specified in sig to the process whose PID is given in pid. The permissions required to send…
NAME sigprocmask, rt_sigprocmask – examine and change blocked signals SYNOPSIS #include <signal.h> /* Prototype for the glibc wrapper function */ int sigprocmask(int how, const sigset_t *set, sigset_t *oldset); /* Prototype for the underlying system call */ int rt_sigprocmask(int how, const kernel_sigset_t *set, kernel_sigset_t *oldset, size_t sigsetsize); /* Prototype for the legacy system call (deprecated) */…
NAME sigpending, rt_sigpending – examine pending signals SYNOPSIS #include <signal.h> int sigpending(sigset_t *set); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigpending(): _POSIX_C_SOURCE DESCRIPTION sigpending() returns the set of signals that are pending for delivery to the calling thread (i.e., the signals which have been raised while blocked). The mask of pending signals is returned…
NAME signalfd – create a file descriptor for accepting signals SYNOPSIS #include <sys/signalfd.h> int signalfd(int fd, const sigset_t *mask, int flags); DESCRIPTION signalfd() creates a file descriptor that can be used to accept signals targeted at the caller. This provides an alternative to the use of a signal handler or sigwaitinfo(2), and has the advantage…
NAME signalfd – create a file descriptor for accepting signals SYNOPSIS #include <sys/signalfd.h> int signalfd(int fd, const sigset_t *mask, int flags); DESCRIPTION signalfd() creates a file descriptor that can be used to accept signals targeted at the caller. This provides an alternative to the use of a signal handler or sigwaitinfo(2), and has the advantage…
NAME signal – ANSI C signal handling SYNOPSIS #include <signal.h> typedef void (*sighandler_t)(int); sighandler_t signal(int signum, sighandler_t handler); DESCRIPTION WARNING: the behavior of signal() varies across UNIX versions, and has also varied historically across different versions of Linux. Avoid its use: use sigaction(2) instead. See Portability below. signal() sets the disposition of the signal signum…
NAME sigaltstack – set and/or get signal stack context SYNOPSIS #include <signal.h> int sigaltstack(const stack_t *ss, stack_t *old_ss); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigaltstack(): _XOPEN_SOURCE >= 500 || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L || /* Glibc versions <= 2.19: */ _BSD_SOURCE DESCRIPTION sigaltstack() allows a thread to define a new alternate signal stack and/or retrieve the state of an existing alternate signal stack….
NAME sigaction, rt_sigaction – examine and change a signal action SYNOPSIS #include <signal.h> int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigaction(): _POSIX_C_SOURCE siginfo_t: _POSIX_C_SOURCE >= 199309L DESCRIPTION The sigaction() system call is used to change the action taken by a process on receipt of…
NAME shutdown – shut down part of a full-duplex connection SYNOPSIS #include <sys/socket.h> int shutdown(int sockfd, int how); DESCRIPTION The shutdown() call causes all or part of a full-duplex connection on the socket associated with sockfd to be shut down. If how is SHUT_RD, further receptions will be disallowed. If how is SHUT_WR, further transmissions…
NAME shmat, shmdt – System V shared memory operations SYNOPSIS #include <sys/shm.h> #include <sys/types.h> void *shmat(int shmid, const void *shmaddr, int shmflg); int shmdt(const void *shmaddr); DESCRIPTION shmat() shmat() attaches the System V shared memory segment identified by shmid to the address space of the calling process. The attaching address is specified by shmaddr with…
NAME shmget – allocates a System V shared memory segment SYNOPSIS #include <sys/ipc.h> #include <sys/shm.h> int shmget(key_t key, size_t size, int shmflg); DESCRIPTION shmget() returns the identifier of the System V shared memory segment associated with the value of the argument key. It may be used either to obtain the identifier of a previously created…
NAME shmat, shmdt – System V shared memory operations SYNOPSIS #include <sys/shm.h> #include <sys/types.h> void *shmat(int shmid, const void *shmaddr, int shmflg); int shmdt(const void *shmaddr); DESCRIPTION shmat() shmat() attaches the System V shared memory segment identified by shmid to the address space of the calling process. The attaching address is specified by shmaddr with…