Section 2: system calls
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 SynopsisUnimplemented system calls. DescriptionThese system calls are not implemented in the Linux kernel. Return ValueThese system calls always return -1 and set errno to ENOSYS. NotesNote that ftime(3), profil(3), and…
stime – set time Synopsis#include <time.h> int stime(const time_t *t); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): stime(): Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19 and earlier: _SVID_SOURCE DescriptionNOTE: This function is deprecated; use clock_settime(2) instead. stime() sets the system’s idea of the time and date. The time, pointed to by t, is measured in…
statx – get file status (extended) Synopsis#include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <fcntl.h> /* Definition of AT_* constants */ int statx(int dirfd, const char *pathname, int flags, unsigned int mask, struct statx *statxbuf);DescriptionThis function returns information about a file, storing it in the buffer pointed to by statxbuf. The returned buffer is a structure…
statvfs, fstatvfs – get filesystem statistics Synopsis#include <sys/statvfs.h> int statvfs(const char *path, struct statvfs *buf); int fstatvfs(int fd, struct statvfs *buf); DescriptionThe function statvfs() returns information about a mounted filesystem. path is the pathname of any file within the mounted filesystem. buf is a pointer to a statvfs structure defined approximately as follows: struct statvfs…
statfs, fstatfs – get filesystem statistics Synopsis#include <sys/vfs.h> /* or <sys/statfs.h> */ int statfs(const char *path, struct statfs *buf); int fstatfs(int fd, struct statfs *buf); DescriptionThe statfs() system call returns information about a mounted filesystem. path is the pathname of any file within the mounted filesystem. buf is a pointer to a statfs structure defined…
statfs, fstatfs – get filesystem statistics Synopsis#include <sys/vfs.h> /* or <sys/statfs.h> */ int statfs(const char *path, struct statfs *buf); int fstatfs(int fd, struct statfs *buf); DescriptionThe statfs() system call returns information about a mounted filesystem. path is the pathname of any file within the mounted filesystem. buf is a pointer to a statfs structure defined…
stat, fstat, lstat, fstatat – get file status Synopsis#include <sys/types.h> #include <sys/stat.h> #include <unistd.h> int stat(const char *pathname, struct stat *statbuf); int fstat(int fd, struct stat *statbuf); int lstat(const char *pathname, struct stat *statbuf); #include <fcntl.h> /* Definition of AT_* constants */ #include <sys/stat.h> int fstatat(int dirfd, const char *pathname, struct stat *statbuf, int flags);Feature…
sgetmask, ssetmask – manipulation of signal mask (obsolete) Synopsislong sgetmask(void); long ssetmask(long newmask); Note: There are no glibc wrappers for these system calls; see NOTES. DescriptionThese system calls are obsolete. Do not use them; use sigprocmask(2) instead. sgetmask() returns the signal mask of the calling process. ssetmask() sets the signal mask of the calling process…
spufs – the SPU file system DescriptionThe SPU file system is used on PowerPC machines that implement the Cell Broadband Engine Architecture in order to access Synergistic Processor Units (SPUs). The file system provides a name space similar to posix shared memory or message queues. Users that have write permissions on the file system can…
spu_run – execute an SPU context Synopsis#include <sys/spu.h> int spu_run(int fd, unsigned int *npc, unsigned int *event);Note: There is no glibc wrapper for this system call; see NOTES. DescriptionThe spu_run() system call is used on PowerPC machines that implement the Cell Broadband Engine Architecture in order to access Synergistic Processor Units (SPUs). The fd argument…
spu_create – create a new spu context Synopsis#include <sys/types.h> #include <sys/spu.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. DescriptionThe spu_create() system call is used on PowerPC machines that implement the Cell Broadband Engine Architecture in order to access Synergistic Processor Units…
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);Descriptionsplice() moves data between two file descriptors without copying between kernel address space and user address space. It transfers up to len bytes of data from the…
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]); DescriptionThe 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 of these arguments,…
socketcall – socket system calls Synopsis#include <linux/net.h> int socketcall(int call, unsigned long *args); Descriptionsocketcall() 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 call the appropriate…
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 Descriptionsigwaitinfo() suspends execution of the calling thread until one of the signals in set is pending (If one…
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 Descriptionsigwaitinfo() suspends execution of the calling thread until one of the signals in set is pending (If one…
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 Descriptionsigsuspend() 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 to invoke a…
sigreturn, rt_sigreturn – return from signal handler and cleanup stack frame Synopsisint sigreturn(…); DescriptionIf 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 onto the CPU),…
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 Descriptionsigqueue() sends the signal specified in sig to the process whose PID is given in pid. The permissions required to send a signal are…
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) */ int sigprocmask(int…