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Top Forums Programming system calls vs librery routines Post 61565 by MKSRaja on Saturday 5th of February 2005 12:09:04 AM
Old 02-05-2005
system calls vs librery routines

can i know what is the differnece between using librery function and system calls for performing any of the operation like read, write and other operations
 

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

NAME
afs_syscall, break, ftime, gtty, lock, mpx, phys, prof, profil, stty, ulimit - unimplemented system calls SYNOPSIS
Unimplemented system calls. DESCRIPTION
These system calls are not implemented in the Linux 2.0 kernel. RETURN VALUE
These system calls always return -1 and set errno to ENOSYS. NOTES
Note that ftime(3), profil(3) and ulimit(3) are implemented as library functions. Some system calls, like ioperm(2), iopl(2), ptrace(2) and vm86(2) only exist on certain architectures. Some system calls, like ipc(2) and {create,init,delete}_module(2) only exist when the Linux kernel was built with support for them. SEE ALSO
obsolete(2) Linux 2.0 1998-06-12 UNIMPLEMENTED(2)
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