version 1, including all changes.
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SYSCALLS |
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!!!SYSCALLS |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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---- |
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!!NAME |
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none - list of all system calls |
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!!SYNOPSIS |
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Linux 2.0 system calls. |
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!!DESCRIPTION |
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As of Linux 2.0.34, there are 164 system calls listed in |
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''/usr/include/asm/unistd.h''. This man page lists |
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them. |
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_llseek(2), _newselect(2), _sysctl(2), access(2), acct(2), |
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adjtimex(2), afs_syscall, alarm(2), bdflush(2), break, |
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brk(2), chdir(2), chmod(2), chown(2), chroot(2), clone(2), |
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close(2), creat(2), create_module(2), delete_module(2), |
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dup(2), dup2(2), execve(2), exit(2), fchdir(2), fchmod(2), |
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fchown(2), fcntl(2), fdatasync(2), flock(2), fork(2), |
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fstat(2), fstatfs(2), fsync(2), ftime, ftruncate(2), get- |
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_kernel_syms(2), getdents(2), getegid(2), geteuid(2), get- |
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gid(2), getgroups(2), getitimer(2), getpgid(2), get- |
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pgrp(2), getpid(2), getppid(2), getpriority(2), get- |
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rlimit(2), getrusage(2), getsid(2), gettimeofday(2), get- |
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uid(2), gtty, idle(2), init_module(2), ioctl(2), io- |
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perm(2), iopl(2), ipc(2), kill(2), link(2), lock, lseek(2), |
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lstat(2), mkdir(2), mknod(2), mlock(2), mlockall(2), |
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mmap(2), modify_ldt(2), mount(2), mprotect(2), mpx, |
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mremap(2), msync(2), munlock(2), munlockall(2), munmap(2), |
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nanosleep(2), nice(2), oldfstat, oldlstat, oldolduname, |
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oldstat, olduname, open(2), pause(2), personality(2), phys, |
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pipe(2), prof, profil, ptrace(2), quotactl(2), read(2), |
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readdir(2), readlink(2), readv(2), reboot(2), rename(2), |
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rmdir(2), sched_get_- priority_max(2), |
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sched_get_priority_min(2), sched_get- param(2), |
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sched_getscheduler(2), sched_rr_get_interval(2), |
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sched_setparam(2), sched_setscheduler(2), sched_yield(2), |
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select(2), setdomainname(2), setfsgid(2), setfsuid(2), |
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setgid(2), setgroups(2), sethostname(2), setitimer(2), |
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setpgid(2), setpriority(2), setregid(2), setreuid(2), set- |
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rlimit(2), setsid(2), settimeofday(2), setuid(2), setup(2), |
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sgetmask(2), sigaction(2), signal(2), sigpending(2), |
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sigprocmask(2), sigreturn(2), sigsuspend(2), socketcall(2), |
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ssetmask(2), stat(2), statfs(2), stime(2), stty, swapoff(2), |
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swapon(2), symlink(2), sync(2), sysfs(2), sysinfo(2), |
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syslog(2), time(2), times(2), truncate(2), ulimit, umask(2), |
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umount(2), uname(2), unlink(2), uselib(2), ustat(2), |
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utime(2), vhangup(2), vm86(2), wait4(2), waitpid(2), |
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write(2), writev(2). |
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Of the above, 5 are obsolete, namely oldfstat, oldlstat, |
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oldolduname, oldstat and olduname (see also obsolete(2)), |
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and 11 are unimplemented, namely afs_syscall, break, ftime, |
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gtty, lock, mpx, phys, prof, profil, stty and ulimit (see |
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also unimplemented(2)). However, ftime(3), profil(3) and |
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ulimit(3) exist as library routines. The slot for phys is in |
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use since 2.1.116 for umount2; phys will never be |
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implemented. |
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Roughly speaking, the code belonging to the system call with |
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number __NR_xxx defined in ''/usr/include/asm/unistd.h'' |
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can be found in the kernel source in the routine |
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''sys_xxx()''. (The dispatch table for i386 can be found |
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in ''/usr/src/linux/arch/i386/kernel/entry.S''.) There |
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are many exceptions, however, mostly because older system |
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calls were superseded by newer ones, and this has been |
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treated somewhat unsystematically. Below the details for |
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Linux 2.0.34. |
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The defines __NR_oldstat and __NR_stat refer to the routines |
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sys_stat() and sys_newstat(), and similarly for ''fstat'' |
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and ''lstat''. Similarly, the defines __NR_oldolduname, |
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__NR_olduname and __NR_uname refer to the routines |
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sys_olduname(), sys_uname() and sys_newuname(). Thus, |
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__NR_stat and __NR_uname have always referred to the latest |
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version of the system call, and the older ones are for |
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backward compatibility. |
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It is different with ''select'' and ''mmap''. These |
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use five or more parameters, and caused problems the way |
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parameter passing on the i386 used to be set up. Thus, while |
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other architectures have sys_select() ans sys_mmap() |
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corresponding to __NR_select and __NR_mmap, on i386 one |
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finds old_select() and old_mmap() (routines that use a |
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pointer to a parameter block) instead. These days passing |
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five parameters is not a problem anymore, and there is a |
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__NR__newselect (used by libc 6) that corresponds directly |
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to sys_select(). |
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Two other system call numbers, __NR__llseek and __NR__sysctl |
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have an additional underscore absent in sys_llseek() and |
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sys_sysctl(). |
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Then there is __NR_readdir corresponding to old_readdir(), |
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which will read at most one directory entry at a time, and |
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is superseded by sys_getdents(). |
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Finally, the system call 166, with entry point sys_vm86() |
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does not have a symbolic number at all. This version |
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supersedes sys_vm86old() with number __NR_vm86. |
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---- |
