how to differentiate system call from library call

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LEARN ABOUT PLAN9

mq_getsetattr

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

NAME

       mq_getsetattr - get/set message queue attributes

SYNOPSIS

       #include <sys/types.h>
       #include <mqueue.h>

       int mq_getsetattr(mqd_t mqdes, struct mq_attr *newattr,
			struct mq_attr *oldattr);

       Note: There is no glibc wrapper for this system call; see NOTES.

DESCRIPTION

       Do not use this system call.

       This  is the low-level system call used to implement mq_getattr(3) and mq_setattr(3).  For an explanation of how this system call operates,
       see the description of mq_setattr(3).

CONFORMING TO

       This interface is nonstandard; avoid its use.

NOTES

       Glibc does not provide a wrapper for this system call; call it using syscall(2).  (Actually, never call it  unless  you	are  writing  a  C
       library!)

SEE ALSO

       mq_getattr(3), mq_overview(7)

COLOPHON

       This  page is part of release 4.15 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								    2017-09-15							  MQ_GETSETATTR(2)

UNIX for Advanced & Expert Users