07-19-2007
Check the man page. For chmod it will be something like chmod(2). Your OS will have specific sections of the man pages dedicated to things like system calls, user commands, admin commands, files and so on. The (2) usually means system call on most systems. Now check the man page for something else like fprintf. You will see either fprintf(3C) or fprintf(3). On most systems, section 3/3C is for library functions.
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=======
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LEARN ABOUT PHP
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)