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man:syscalls

SYSCALLS(2) Linux Programmer's Manual SYSCALLS(2)

NAME

     syscalls - Linux system calls

SYNOPSIS

     Linux system calls.

DESCRIPTION

     The system call is the fundamental interface between an application and
     the Linux kernel.
 System calls and library wrapper functions
     System calls are generally not invoked directly, but rather via wrapper
     functions  in  glibc  (or  perhaps some other library).  For details of
     direct invocation of a system  call,  see  intro(2).   Often,  but  not
     always, the name of the wrapper function is the same as the name of the
     system call that it invokes.  For example, glibc  contains  a  function
     truncate() which invokes the underlying "truncate" system call.
     Often the glibc wrapper function is quite thin, doing little work other
     than copying arguments to the right registers before invoking the  sys-
     tem  call,  and  then setting errno appropriately after the system call
     has returned.   (These  are  the  same  steps  that  are  performed  by
     syscall(2), which can be used to invoke system calls for which no wrap-
     per function is provided.)  Note: system calls indicate  a  failure  by
     returning a negative error number to the caller; when this happens, the
     wrapper function negates the returned error number (to  make  it  posi-
     tive), copies it to errno, and returns -1 to the caller of the wrapper.
     Sometimes, however, the wrapper function does some  extra  work  before
     invoking the system call.  For example, nowadays there are (for reasons
     described below)  two  related  system  calls,  truncate(2)  and  trun-
     cate64(2),  and  the  glibc truncate() wrapper function checks which of
     those system calls are provided by  the  kernel  and  determines  which
     should be employed.
 System call list
     Below  is  a  list  of the Linux system calls.  In the list, the Kernel
     column indicates the kernel version for those system  calls  that  were
     new in Linux 2.2, or have appeared since that kernel version.  Note the
     following points:
  • Where no kernel version is indicated, the system call appeared in

kernel 1.0 or earlier.

  • Where a system call is marked "1.2" this means the system call prob-

ably appeared in a 1.1.x kernel version, and first appeared in a

        stable  kernel  with 1.2.  (Development of the 1.2 kernel was initi-
        ated from a branch of kernel 1.0.6 via  the  1.1.x  unstable  kernel
        series.)
  • Where a system call is marked "2.0" this means the system call prob-

ably appeared in a 1.3.x kernel version, and first appeared in a

        stable  kernel  with 2.0.  (Development of the 2.0 kernel was initi-
        ated from a branch of kernel 1.2.x, somewhere around 1.2.10, via the
        1.3.x unstable kernel series.)
  • Where a system call is marked "2.2" this means the system call prob-

ably appeared in a 2.1.x kernel version, and first appeared in a

        stable kernel with 2.2.0.  (Development of the 2.2 kernel was initi-
        ated from a branch of kernel 2.0.21 via the  2.1.x  unstable  kernel
        series.)
  • Where a system call is marked "2.4" this means the system call prob-

ably appeared in a 2.3.x kernel version, and first appeared in a

        stable kernel with 2.4.0.  (Development of the 2.4 kernel was initi-
        ated from a branch of kernel 2.2.8 via  the  2.3.x  unstable  kernel
        series.)
  • Where a system call is marked "2.6" this means the system call prob-

ably appeared in a 2.5.x kernel version, and first appeared in a

        stable  kernel with 2.6.0.  (Development of kernel 2.6 was initiated
        from a branch  of  kernel  2.4.15  via  the  2.5.x  unstable  kernel
        series.)
  • Starting with kernel 2.6.0, the development model changed, and new

system calls may appear in each 2.6.x release. In this case, the

        exact  version number where the system call appeared is shown.  This
        convention continues with the 3.x kernel series, which  followed  on
        from  kernel  2.6.39,  and  the 4.x kernel series, which followed on
        from kernel 3.19.
  • In some cases, a system call was added to a stable kernel series

after it branched from the previous stable kernel series, and then

        backported into the earlier stable kernel series.  For example  some
        system  calls  that  appeared  in  2.6.x were also backported into a
        2.4.x release after 2.4.15.  When this is so, the version where  the
        system call appeared in both of the major kernel series is listed.
     The  list of system calls that are available as at kernel 4.11 (or in a
     few cases only on older kernels) is as follows:
     System call                Kernel        Notes
     --------------------------------------------------------------------
     _llseek(2)                 1.2
     _newselect(2)              2.0
     _sysctl(2)                 2.0
     accept(2)                  2.0           See notes on socketcall(2)
     accept4(2)                 2.6.28
     access(2)                  1.0
     acct(2)                    1.0
     add_key(2)                 2.6.10
     adjtimex(2)                1.0
     alarm(2)                   1.0
     alloc_hugepages(2)         2.5.36        Removed in 2.5.44
     bdflush(2)                 1.2           Deprecated (does nothing)
                                              since 2.6
     bind(2)                    2.0           See notes on socketcall(2)
     bpf(2)                     3.18
     brk(2)                     1.0
     cacheflush(2)              1.2           Not on x86
     capget(2)                  2.2
     capset(2)                  2.2
     chdir(2)                   1.0
     chmod(2)                   1.0
     chown(2)                   2.2           See chown(2) for
                                              version details
     chown32(2)                 2.4
     chroot(2)                  1.0
     clock_adjtime(2)           2.6.39
     clock_getres(2)            2.6
     clock_gettime(2)           2.6
     clock_nanosleep(2)         2.6
     clock_settime(2)           2.6
     clone(2)                   1.0
     close(2)                   1.0
     connect(2)                 2.0           See notes on socketcall(2)
     copy_file_range(2)         4.5
     creat(2)                   1.0
     create_module(2)           1.0           Removed in 2.6
     delete_module(2)           1.0
     dup(2)                     1.0
     dup2(2)                    1.0
     dup3(2)                    2.6.27
     epoll_create(2)            2.6
     epoll_create1(2)           2.6.27
     epoll_ctl(2)               2.6
     epoll_pwait(2)             2.6.19
     epoll_wait(2)              2.6
     eventfd(2)                 2.6.22
     eventfd2(2)                2.6.27
     execve(2)                  1.0
     execveat(2)                3.19
     exit(2)                    1.0
     exit_group(2)              2.6
     faccessat(2)               2.6.16
     fadvise64(2)               2.6
     fadvise64_64(2)            2.6
     fallocate(2)               2.6.23
     fanotify_init(2)           2.6.37
     fanotify_mark(2)           2.6.37
     fchdir(2)                  1.0
     fchmod(2)                  1.0
     fchmodat(2)                2.6.16
     fchown(2)                  1.0
     fchown32(2)                2.4
     fchownat(2)                2.6.16
     fcntl(2)                   1.0
     fcntl64(2)                 2.4
     fdatasync(2)               2.0
     fgetxattr(2)               2.6; 2.4.18
     finit_module(2)            3.8
     flistxattr(2)              2.6; 2.4.18
     flock(2)                   2.0
     fork(2)                    1.0
     free_hugepages(2)          2.5.36        Removed in 2.5.44
     fremovexattr(2)            2.6; 2.4.18
     fsetxattr(2)               2.6; 2.4.18
     fstat(2)                   1.0
     fstat64(2)                 2.4
     fstatat64(2)               2.6.16
     fstatfs(2)                 1.0
     fstatfs64(2)               2.6
     fsync(2)                   1.0
     ftruncate(2)               1.0
     ftruncate64(2)             2.4
     futex(2)                   2.6
     futimesat(2)               2.6.16
     get_kernel_syms(2)         1.0           Removed in 2.6
     get_mempolicy(2)           2.6.6
     get_robust_list(2)         2.6.17
     get_thread_area(2)         2.6
     getcpu(2)                  2.6.19
     getcwd(2)                  2.2
     getdents(2)                2.0
     getdents64(2)              2.4
     getegid(2)                 1.0
     getegid32(2)               2.4
     geteuid(2)                 1.0
     geteuid32(2)               2.4
     getgid(2)                  1.0
     getgid32(2)                2.4
     getgroups(2)               1.0
     getgroups32(2)             2.4
     getitimer(2)               1.0
     getpeername(2)             2.0           See notes on socketcall(2)
     getpagesize(2)             2.0           Not on x86
     getpgid(2)                 1.0
     getpgrp(2)                 1.0
     getpid(2)                  1.0
     getppid(2)                 1.0
     getpriority(2)             1.0
     getrandom(2)               3.17
     getresgid(2)               2.2
     getresgid32(2)             2.4
     getresuid(2)               2.2
     getresuid32(2)             2.4
     getrlimit(2)               1.0
     getrusage(2)               1.0
     getsid(2)                  2.0
     getsockname(2)             2.0           See notes on socketcall(2)
     getsockopt(2)              2.0           See notes on socketcall(2)
     gettid(2)                  2.4.11
     gettimeofday(2)            1.0
     getuid(2)                  1.0
     getuid32(2)                2.4
     getunwind(2)               2.4.8         ia64; deprecated
     getxattr(2)                2.6; 2.4.18
     init_module(2)             1.0
     inotify_add_watch(2)       2.6.13
     inotify_init(2)            2.6.13
     inotify_init1(2)           2.6.27
     inotify_rm_watch(2)        2.6.13
     io_cancel(2)               2.6
     io_destroy(2)              2.6
     io_getevents(2)            2.6
     io_setup(2)                2.6
     io_submit(2)               2.6
     ioctl(2)                   1.0
     ioperm(2)                  1.0
     iopl(2)                    1.0
     ioprio_get(2)              2.6.13
     ioprio_set(2)              2.6.13
     ipc(2)                     1.0
     kcmp(2)                    3.5
     kern_features(2)           3.7           Sparc64
     kexec_file_load(2)         3.17
     kexec_load(2)              2.6.13
     keyctl(2)                  2.6.10
     kill(2)                    1.0
     lchown(2)                  1.0           See chown(2) for
                                              version details
     lchown32(2)                2.4
     lgetxattr(2)               2.6; 2.4.18
     link(2)                    1.0
     linkat(2)                  2.6.16
     listen(2)                  2.0           See notes on socketcall(2)
     listxattr(2)               2.6; 2.4.18
     llistxattr(2)              2.6; 2.4.18
     lookup_dcookie(2)          2.6
     lremovexattr(2)            2.6; 2.4.18
     lseek(2)                   1.0
     lsetxattr(2)               2.6; 2.4.18
     lstat(2)                   1.0
     lstat64(2)                 2.4
     madvise(2)                 2.4
     mbind(2)                   2.6.6
     membarrier(2)              3.17
     memfd_create(2)            3.17
     migrate_pages(2)           2.6.16
     mincore(2)                 2.4
     mkdir(2)                   1.0
     mkdirat(2)                 2.6.16
     mknod(2)                   1.0
     mknodat(2)                 2.6.16
     mlock(2)                   2.0
     mlock2(2)                  4.4
     mlockall(2)                2.0
     mmap(2)                    1.0
     mmap2(2)                   2.4
     modify_ldt(2)              1.0
     mount(2)                   1.0
     move_pages(2)              2.6.18
     mprotect(2)                1.0
     mq_getsetattr(2)           2.6.6
     mq_notify(2)               2.6.6
     mq_open(2)                 2.6.6
     mq_timedreceive(2)         2.6.6
     mq_timedsend(2)            2.6.6
     mq_unlink(2)               2.6.6
     mremap(2)                  2.0
     msgctl(2)                  2.0           See notes on ipc(2)
     msgget(2)                  2.0           See notes on ipc(2)
     msgrcv(2)                  2.0           See notes on ipc(2)
     msgsnd(2)                  2.0           See notes on ipc(2)
     msync(2)                   2.0
     munlock(2)                 2.0
     munlockall(2)              2.0
     munmap(2)                  1.0
     name_to_handle_at(2)       2.6.39
     nanosleep(2)               2.0
     nfsservctl(2)              2.2           Removed in 3.1
     nice(2)                    1.0
     oldfstat(2)                1.0
     oldlstat(2)                1.0
     oldolduname(2)             1.0
     oldstat(2)                 1.0
     olduname(2)                1.0
     open(2)                    1.0
     open_by_handle_at(2)       2.6.39
     openat(2)                  2.6.16
     pause(2)                   1.0
     pciconfig_iobase(2)        2.2.15; 2.4   Not on x86
     pciconfig_read(2)          2.0.26; 2.2   Not on x86
     pciconfig_write(2)         2.0.26; 2.2   Not on x86
     perf_event_open(2)         2.6.31        Was perf_counter_open() in
                                              2.6.31; renamed in 2.6.32
     personality(2)             1.2
     perfctr(2)                 2.2           Sparc; removed in 2.6.34
     perfmonctl(2)              2.4           ia64
     pipe(2)                    1.0
     pipe2(2)                   2.6.27
     pivot_root(2)              2.4
     pkey_alloc(2)              4.8
     pkey_free(2)               4.8
     pkey_mprotect(2)           4.8
     poll(2)                    2.0.36; 2.2
     ppc_rtas(2)                2.6.2         PowerPC only
     ppc_swapcontext(2)         2.6.3         PowerPC only
     ppoll(2)                   2.6.16
     prctl(2)                   2.2
     pread64(2)                               Added as "pread" in 2.2;
                                              renamed "pread64" in 2.6
     preadv(2)                  2.6.30
     preadv2(2)                 4.6
     prlimit64(2)               2.6.36
     process_vm_readv(2)        3.2
     process_vm_writev(2)       3.2
     pselect6(2)                2.6.16
     ptrace(2)                  1.0
     pwrite64(2)                              Added as "pwrite" in 2.2;
                                              renamed "pwrite64" in 2.6
     pwritev(2)                 2.6.30
     pwritev2(2)                4.6
     query_module(2)            2.2           Removed in 2.6
     quotactl(2)                1.0
     read(2)                    1.0
     readahead(2)               2.4.13
     readdir(2)                 1.0
     readlink(2)                1.0
     readlinkat(2)              2.6.16
     readv(2)                   2.0
     reboot(2)                  1.0
     recv(2)                    2.0           See notes on socketcall(2)
     recvfrom(2)                2.0           See notes on socketcall(2)
     recvmsg(2)                 2.0           See notes on socketcall(2)
     recvmmsg(2)                2.6.33
     remap_file_pages(2)        2.6           Deprecated since 3.16
     removexattr(2)             2.6; 2.4.18
     rename(2)                  1.0
     renameat(2)                2.6.16
     renameat2(2)               3.15
     request_key(2)             2.6.10
     restart_syscall(2)         2.6
     rmdir(2)                   1.0
     rt_sigaction(2)            2.2
     rt_sigpending(2)           2.2
     rt_sigprocmask(2)          2.2
     rt_sigqueueinfo(2)         2.2
     rt_sigreturn(2)            2.2
     rt_sigsuspend(2)           2.2
     rt_sigtimedwait(2)         2.2
     rt_tgsigqueueinfo(2)       2.6.31
     s390_runtime_instr(2)      3.7           s390 only
     s390_pci_mmio_read(2)      3.19          s390 only
     s390_pci_mmio_write(2)     3.19          s390 only
     s390_sthyi(2)              4.15          s390 only
     sched_get_priority_max(2)  2.0
     sched_get_priority_min(2)  2.0
     sched_getaffinity(2)       2.6
     sched_getattr(2)           3.14
     sched_getparam(2)          2.0
     sched_getscheduler(2)      2.0
     sched_rr_get_interval(2)   2.0
     sched_setaffinity(2)       2.6
     sched_setattr(2)           3.14
     sched_setparam(2)          2.0
     sched_setscheduler(2)      2.0
     sched_yield(2)             2.0
     seccomp(2)                 3.17
     select(2)                  1.0
     semctl(2)                  2.0           See notes on ipc(2)
     semget(2)                  2.0           See notes on ipc(2)
     semop(2)                   2.0           See notes on ipc(2)
     semtimedop(2)              2.6; 2.4.22
     send(2)                    2.0           See notes on socketcall(2)
     sendfile(2)                2.2
     sendfile64(2)              2.6; 2.4.19
     sendmmsg(2)                3.0
     sendmsg(2)                 2.0           See notes on socketcall(2)
     sendto(2)                  2.0           See notes on socketcall(2)
     set_mempolicy(2)           2.6.6
     set_robust_list(2)         2.6.17
     set_thread_area(2)         2.6
     set_tid_address(2)         2.6
     setdomainname(2)           1.0
     setfsgid(2)                1.2
     setfsgid32(2)              2.4
     setfsuid(2)                1.2
     setfsuid32(2)              2.4
     setgid(2)                  1.0
     setgid32(2)                2.4
     setgroups(2)               1.0
     setgroups32(2)             2.4
     sethostname(2)             1.0
     setitimer(2)               1.0
     setns(2)                   3.0
     setpgid(2)                 1.0
     setpriority(2)             1.0
     setregid(2)                1.0
     setregid32(2)              2.4
     setresgid(2)               2.2
     setresgid32(2)             2.4
     setresuid(2)               2.2
     setresuid32(2)             2.4
     setreuid(2)                1.0
     setreuid32(2)              2.4
     setrlimit(2)               1.0
     setsid(2)                  1.0
     setsockopt(2)              2.0           See notes on socketcall(2)
     settimeofday(2)            1.0
     setuid(2)                  1.0
     setuid32(2)                2.4
     setup(2)                   1.0           Removed in 2.2
     setxattr(2)                2.6; 2.4.18
     sgetmask(2)                1.0
     shmat(2)                   2.0           See notes on ipc(2)
     shmctl(2)                  2.0           See notes on ipc(2)
     shmdt(2)                   2.0           See notes on ipc(2)
     shmget(2)                  2.0           See notes on ipc(2)
     shutdown(2)                2.0           See notes on socketcall(2)
     sigaction(2)               1.0
     sigaltstack(2)             2.2
     signal(2)                  1.0
     signalfd(2)                2.6.22
     signalfd4(2)               2.6.27
     sigpending(2)              1.0
     sigprocmask(2)             1.0
     sigreturn(2)               1.0
     sigsuspend(2)              1.0
     socket(2)                  2.0           See notes on socketcall(2)
     socketcall(2)              1.0
     socketpair(2)              2.0           See notes on socketcall(2)
     splice(2)                  2.6.17
     spu_create(2)              2.6.16        PowerPC only
     spu_run(2)                 2.6.16        PowerPC only
     ssetmask(2)                1.0
     stat(2)                    1.0
     stat64(2)                  2.4
     statfs(2)                  1.0
     statfs64(2)                2.6
     statx(2)                   4.11
     stime(2)                   1.0
     subpage_prot(2)            2.6.25        PowerPC only
     swapoff(2)                 1.0
     swapon(2)                  1.0
     symlink(2)                 1.0
     symlinkat(2)               2.6.16
     sync(2)                    1.0
     sync_file_range(2)         2.6.17
     sync_file_range2(2)        2.6.22
     syncfs(2)                  2.6.39
     sysfs(2)                   1.2
     sysinfo(2)                 1.0
     syslog(2)                  1.0
     tee(2)                     2.6.17
     tgkill(2)                  2.6
     time(2)                    1.0
     timer_create(2)            2.6
     timer_delete(2)            2.6
     timer_getoverrun(2)        2.6
     timer_gettime(2)           2.6
     timer_settime(2)           2.6
     timerfd_create(2)          2.6.25
     timerfd_gettime(2)         2.6.25
     timerfd_settime(2)         2.6.25
     times(2)                   1.0
     tkill(2)                   2.6; 2.4.22
     truncate(2)                1.0
     truncate64(2)              2.4
     ugetrlimit(2)              2.4
     umask(2)                   1.0
     umount(2)                  1.0
     umount2(2)                 2.2
     uname(2)                   1.0
     unlink(2)                  1.0
     unlinkat(2)                2.6.16
     unshare(2)                 2.6.16
     uselib(2)                  1.0
     ustat(2)                   1.0
     userfaultfd(2)             4.3
     utime(2)                   1.0
     utimensat(2)               2.6.22
     utimes(2)                  2.2
     utrap_install(2)           2.2           Sparc only
     vfork(2)                   2.2
     vhangup(2)                 1.0
     vm86old(2)                 1.0           Was "vm86"; renamed in
                                              2.0.28/2.2
     vm86(2)                    2.0.28; 2.2
     vmsplice(2)                2.6.17
     wait4(2)                   1.0
     waitid(2)                  2.6.10
     waitpid(2)                 1.0
     write(2)                   1.0
     writev(2)                  2.0
     On many platforms, including x86-32, socket calls are  all  multiplexed
     (via  glibc wrapper functions) through socketcall(2) and similarly Sys-
     tem V IPC calls are multiplexed through ipc(2).
     Although slots are reserved for them in the system call table, the fol-
     lowing  system  calls  are  not  implemented  in  the  standard kernel:
     afs_syscall(2),  break(2),  ftime(2),  getpmsg(2),  gtty(2),   idle(2),
     lock(2),  madvise1(2), mpx(2), phys(2), prof(2), profil(2), putpmsg(2),
     security(2), stty(2), tuxcall(2), ulimit(2), and vserver(2)  (see  also
     unimplemented(2)).   However,  ftime(3), profil(3), and ulimit(3) exist
     as library routines.  The slot for  phys(2)  is  in  use  since  kernel
     2.1.116   for  umount(2);  phys(2)  will  never  be  implemented.   The
     getpmsg(2) and putpmsg(2) calls are  for  kernels  patched  to  support
     STREAMS, and may never be in the standard kernel.
     There  was  briefly  set_zone_reclaim(2),  added  in  Linux 2.6.13, and
     removed in 2.6.16; this system call was never available to user  space.

NOTES

     Roughly  speaking,  the  code  belonging to the system call with number
     __NR_xxx defined in /usr/include/asm/unistd.h can be found in the Linux
     kernel  source  in the routine sys_xxx().  (The dispatch table for i386
     can be found in  /usr/src/linux/arch/i386/kernel/entry.S.)   There  are
     many exceptions, however, mostly because older system calls were super-
     seded by newer ones, and this has been  treated  somewhat  unsystemati-
     cally.   On platforms with proprietary operating-system emulation, such
     as parisc, sparc, sparc64, and alpha, there are many additional  system
     calls; mips64 also contains a full set of 32-bit system calls.
     Over  time,  changes  to  the interfaces of some system calls have been
     necessary.  One reason for such changes was the need  to  increase  the
     size of structures or scalar values passed to the system call.  Because
     of these changes, certain architectures (notably,  longstanding  32-bit
     architectures  such  as i386) now have various groups of related system
     calls (e.g.,  truncate(2)  and  truncate64(2))  which  perform  similar
     tasks,  but  which vary in details such as the size of their arguments.
     (As noted earlier, applications are  generally  unaware  of  this:  the
     glibc  wrapper  functions  do some work to ensure that the right system
     call is invoked, and that ABI compatibility is preserved for old  bina-
     ries.)   Examples  of systems calls that exist in multiple versions are
     the following:
  • By now there are three different versions of stat(2): sys_stat()

(slot NR_oldstat), sys_newstat() (slot NR_stat), and

        sys_stat64() (slot __NR_stat64), with the last being the  most  cur-
        rent.  A similar story applies for lstat(2) and fstat(2).
  • Similarly, the defines NR_oldolduname, NR_olduname, and

NR_uname refer to the routines sys_olduname(), sys_uname() and sys_newuname(). * In Linux 2.0, a new version of vm86(2) appeared, with the old and the new kernel routines being named sys_vm86old() and sys_vm86(). * In Linux 2.4, a new version of getrlimit(2) appeared, with the old and the new kernel routines being named sys_old_getrlimit() (slot NR_getrlimit) and sys_getrlimit() (slot NR_ugetrlimit). * Linux 2.4 increased the size of user and group IDs from 16 to 32 bits. To support this change, a range of system calls were added (e.g., chown32(2), getuid32(2), getgroups32(2), setresuid32(2)), superseding earlier calls of the same name without the "32" suffix. * Linux 2.4 added support for applications on 32-bit architectures to access large files (i.e., files for which the sizes and file offsets can't be represented in 32 bits.) To support this change, replace- ments were required for system calls that deal with file offsets and sizes. Thus the following system calls were added: fcntl64(2), get- dents64(2), stat64(2), statfs64(2), truncate64(2), and their analogs that work with file descriptors or symbolic links. These system calls supersede the older system calls which, except in the case of the "stat" calls, have the same name without the "64" suffix. On newer platforms that only have 64-bit file access and 32-bit UIDs/GIDs (e.g., alpha, ia64, s390x, x86-64), there is just a single version of the UID/GID and file access system calls. On platforms (typically, 32-bit platforms) where the *64 and *32 calls exist, the other versions are obsolete. * The rt_sig* calls were added in kernel 2.2 to support the addition of real-time signals (see signal(7)). These system calls supersede the older system calls of the same name without the "rt_" prefix. * The select(2) and mmap(2) system calls use five or more arguments, which caused problems in the way argument passing on the i386 used to be set up. Thus, while other architectures have sys_select() and sys_mmap() corresponding to NR_select and NR_mmap, on i386 one finds old_select() and old_mmap() (routines that use a pointer to an argument block) instead. These days passing five arguments is not a problem any more, and there is a NRnewselect that corresponds directly to sys_select() and similarly NR_mmap2.

SEE ALSO

     intro(2), syscall(2), unimplemented(2), errno(3), libc(7), vdso(7)

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.

Linux 2018-02-02 SYSCALLS(2)

/data/webs/external/dokuwiki/data/pages/man/syscalls.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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