Linux Manuals

NAME sync, syncfs – commit filesystem caches to disk SYNOPSIS #include <unistd.h> void sync(void); int syncfs(int fd); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sync(): _XOPEN_SOURCE >= 500     || /* Since glibc 2.19: */ _DEFAULT_SOURCE     || /* Glibc versions <= 2.19: */ _BSD_SOURCE syncfs(): _GNU_SOURCE DESCRIPTION sync() causes all pending modifications to filesystem metadata and cached file data to be written to the underlying filesystems. syncfs()…

NAME sync_file_range – sync a file segment with disk SYNOPSIS #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <fcntl.h> int sync_file_range(int fd, off64_t offset, off64_t nbytes, unsigned int flags); DESCRIPTION sync_file_range() permits fine control when synchronizing the open file referred to by the file descriptor fd with disk. offset is the starting byte of the file…

NAME sync_file_range – sync a file segment with disk SYNOPSIS #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <fcntl.h> int sync_file_range(int fd, off64_t offset, off64_t nbytes, unsigned int flags); DESCRIPTION sync_file_range() permits fine control when synchronizing the open file referred to by the file descriptor fd with disk. offset is the starting byte of the file…

NAME sync, syncfs – commit filesystem caches to disk SYNOPSIS #include <unistd.h> void sync(void); int syncfs(int fd); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sync(): _XOPEN_SOURCE >= 500     || /* Since glibc 2.19: */ _DEFAULT_SOURCE     || /* Glibc versions <= 2.19: */ _BSD_SOURCE syncfs(): _GNU_SOURCE DESCRIPTION sync() causes all pending modifications to filesystem metadata and cached file data to be written to the underlying filesystems. syncfs()…

NAME symlink, symlinkat – make a new name for a file SYNOPSIS #include <unistd.h> int symlink(const char *target, const char *linkpath); #include <fcntl.h> /* Definition of AT_* constants */ #include <unistd.h> int symlinkat(const char *target, int newdirfd, const char *linkpath); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): symlink(): _XOPEN_SOURCE >= 500 || _POSIX_C_SOURCE >= 200112L     || /* Glibc versions <= 2.19: */ _BSD_SOURCE symlinkat():…

NAME symlink, symlinkat – make a new name for a file SYNOPSIS #include <unistd.h> int symlink(const char *target, const char *linkpath); #include <fcntl.h> /* Definition of AT_* constants */ #include <unistd.h> int symlinkat(const char *target, int newdirfd, const char *linkpath); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): symlink(): _XOPEN_SOURCE >= 500 || _POSIX_C_SOURCE >= 200112L     || /* Glibc versions <= 2.19: */ _BSD_SOURCE symlinkat():…

NAME swapon, swapoff – start/stop swapping to file/device SYNOPSIS #include <unistd.h> #include <sys/swap.h> int swapon(const char *path, int swapflags); int swapoff(const char *path); DESCRIPTION swapon() sets the swap area to the file or block device specified by path. swapoff() stops swapping to the file or block device specified by path. If the SWAP_FLAG_PREFER flag is…

NAME swapon, swapoff – start/stop swapping to file/device SYNOPSIS #include <unistd.h> #include <sys/swap.h> int swapon(const char *path, int swapflags); int swapoff(const char *path); DESCRIPTION swapon() sets the swap area to the file or block device specified by path. swapoff() stops swapping to the file or block device specified by path. If the SWAP_FLAG_PREFER flag is…

NAME swapcontext – Swap out old context with new context SYNOPSIS int sys_swapcontext (struct ucontext *old_ctx, struct ucontext *new_ctx, int r5, int r6, int r7, int r8, struct pt_regs *regs); DESCRIPTION swapcontext swaps out context old_ctx with new context new_ctx. The int r# values have no place in the system call functionality. The regs value indicates the current user register values from the user…

NAME subpage_prot – define a subpage protection for an address range SYNOPSIS int subpage_prot(unsigned long addr, unsigned long len, uint32_t *map); Note: There is no glibc wrapper for this system call; see NOTES. DESCRIPTION The PowerPC-specific subpage_prot() system call provides the facility to control the access permissions on individual 4 kB subpages on systems configured…

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 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 DESCRIPTION NOTE: 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,…

NAME statx – get file status (extended) SYNOPSIS #include <fcntl.h> /* Definition of AT_* constants */ #include <sys/stat.h> #include <sys/types.h> #include <unistd.h> int statx(int dirfd, const char *pathname, int flags, unsigned int mask, struct statx *statxbuf); DESCRIPTION This function returns information about a file, storing it in the buffer pointed to by statxbuf. The returned…

NAME 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); DESCRIPTION The 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…

NAME 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); DESCRIPTION The 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…

NAME 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); DESCRIPTION The 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…

NAME stat, fstat, lstat, fstatat – get file status SYNOPSIS #include <sys/stat.h> #include <sys/types.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,…

NAME sgetmask, ssetmask – manipulation of signal mask (obsolete) SYNOPSIS long sgetmask(void); long ssetmask(long newmask); Note: There are no glibc wrappers for these system calls; see NOTES. DESCRIPTION These 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…

NAME spufs – the SPU file system DESCRIPTION The 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…

NAME 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. DESCRIPTION The spu_run() system call is used on PowerPC machines that implement the Cell Broadband Engine Architecture in order to access Synergistic Processor Units…