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Full Discussion: Are programs like sys_open( ) ,sys_read( ) et al examples of system level programs ?
Top Forums UNIX for Dummies Questions & Answers Are programs like sys_open( ) ,sys_read( ) et al examples of system level programs ? Post 302365387 by vishwamitra on Tuesday 27th of October 2009 09:22:37 PM
Old 10-27-2009
Are programs like sys_open( ) ,sys_read( ) et al examples of system level programs ?
Are the programs written on schedulers ,thread library , process management, memory management, et al called systems programs ? How are they different from the programs that implement functions like open() , printf() , scanf() , read() .. they have a prefix sys_open, sys_close, sys_read etc , right ? Is there any difference of hierarchy between the programs that implement system calls and system level programs like that implement thread library, process management , memory managemnt etc..
Hope you understood my qstn

---------- Post updated 10-27-09 at 09:22 PM ---------- Previous update was 10-26-09 at 11:01 PM ----------

I got this cleared ..Here goes the clarification
" Functions like open() , printf() , scanf() , read() are library function implemented on top of their sys_* counterparts so they can be used for any Application development. On the other hand sys_open, sys_close, sys_read etc are implemented as-part-of-system commonly known as kernel. On top of this, system programs like thread library, compilers, linkers are implemented which helps other application development. Hope this clears the difference between system, system programs and application programs. "
 

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LEARN ABOUT CENTOS

tkill

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

NAME

       tkill, tgkill - send a signal to a thread

SYNOPSIS

       int tkill(int tid, int sig);

       int tgkill(int tgid, int tid, int sig);

       Note: There are no glibc wrappers for these system calls; see NOTES.

DESCRIPTION

       tgkill()  sends	the signal sig to the thread with the thread ID tid in the thread group tgid.  (By contrast, kill(2) can be used to send a
       signal only to a process (i.e., thread group) as a whole, and the signal will be delivered to an arbitrary thread within that process.)

       tkill() is an obsolete predecessor to tgkill().	It allows only the target thread ID to be specified, which may result in the wrong  thread
       being signaled if a thread terminates and its thread ID is recycled.  Avoid using this system call.

       If tgid is specified as -1, tgkill() is equivalent to tkill().

       These are the raw system call interfaces, meant for internal thread library use.

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS

       EINVAL An invalid thread ID, thread group ID, or signal was specified.

       EPERM  Permission denied.  For the required permissions, see kill(2).

       ESRCH  No process with the specified thread ID (and thread group ID) exists.

VERSIONS

       tkill() is supported since Linux 2.4.19 / 2.5.4.  tgkill() was added in Linux 2.5.75.

CONFORMING TO

       tkill() and tgkill() are Linux-specific and should not be used in programs that are intended to be portable.

NOTES

       See the description of CLONE_THREAD in clone(2) for an explanation of thread groups.

       Glibc does not provide wrappers for these system calls; call them using syscall(2).

SEE ALSO

       clone(2), gettid(2), kill(2), rt_sigqueueinfo(2)

COLOPHON

       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2012-07-13								  TKILL(2)
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