Header Files for UNIX-Type Functions

Programs using the UNIX-type functions must include one or more header files that contain information needed by the functions, such as:

• Macro definitions

• Data type definitions

• Structure definitions

• Function prototypes

The header files are provided in the QSYSINC library, which is optionally installable. Make sure QSYSINC is on your system before compiling programs that use these header files. For information on installing the QSYSINC library, see Data structures and the QSYSINC Library.

Figure 1-1 shows the file and member name in the QSYSINC library for each header file used by the UNIX-type APIs in this publication.

Figure 1-1. Where to Find Header Files

Name of Header File	Name of File in QSYSINC	Name of Member
arpa/inet.h	ARPA	INET
arpa/nameser.h	ARPA	NAMESER
bse.h	H	BSE
bsedos.h	H	BSEDOS
bseerr.h	H	BSEERR
dirent.h	H	DIRENT
errno.h 1	H	ERRNO
fcntl.h	H	FCNTL
grp.h	H	GRP
limits.h 1	H	LIMITS
netdbh.h	H	NETDB
net/if.h	NET	IF
netinet/in.h	NETINET	IN
netinet/ip_icmp.h	NETINET	IP_ICMP
netinet/ip.h	NETINET	IP
netinet/tcp.h	NETINET	TCP
netinet/udp.h	NETINET	UDP
netns/idp.h	NETNS	IDP
netns/ipx.h	NETNS	IPX
netns/ns.h	NETNS	NS
netns/sp.h	NETNS	SP
net/route.h	NET	ROUTE
os2.h	H	OS2
os2def.h	H	OS2DEF
pwd.h	H	PWD
Qlg.h	H	QLG
Qp0lstdi.h	H	QP0LSTDI
qp0wpid.h	H	QP0WPID
qp0ztrc.h	H	QP0ZTRC
qp0ztrml.h	H	QP0ZTRML
qp0z1170.h	H	QP0Z1170
qtomeapi.h	H	QTOMEAPI
qtossapi.h	H	QTOSSAPI
resolv.h	H	RESOLVE
semaphore.h	H	SEMAPHORE
spawn.h	H	SPAWN
sys/ioctl.h	SYS	IOCTL
sys/ipc.h	SYS	IPC
sys/msg.h	SYS	MSG
sys/param.h	SYS	PARAM
sys/sem.h	SYS	SEM
sys/setjmp.h 2	SYS	SETJMP
sys/shm.h	SYS	SHM
sys/signal.h 2	SYS	SIGNAL
sys/socket.h	SYS	SOCKET
sys/stat.h	SYS	STAT
sys/statvfs.h	SYS	STATVFS
sys/time.h	SYS	TIME
sys/types.h	SYS	TYPES
sys/uio.h	SYS	UIO
sys/un.h	SYS	UN
sys/wait.h	SYS	WAIT
unistd.h	H	UNISTD
utime.h	H	UTIME
Note: The QSYSINC library provided by OS/400 and the QCLE library provided by ILE C each contain an errno.h and a limits.h file. The files in QSYSINC are OS/400 extensions of the compiler version of the files in QCLE. The errno.h and limits.h files in QCLE automatically embed the errno.h and limits.h files from QSYSINC. When you include the setjmp.h file from QCLE, it automatically embeds the sys/setjmp.h file from QSYSINC. Similarly, the signal.h file from QCLE automatically embeds the sys/signal.h file from QSYSINC.

You can display a header file in QSYSINC by using one of the following methods:

• Using your editor. For example, to display the unistd.h header file using the Source Entry Utility editor, enter the following command:

  STRSEU SRCFILE(QSYSINC/H) SRCMBR(UNISTD) OPTION(5)
  

• Using the Display Physical File Member command. For example, to display the sys/stat.h header file, enter the following command:

  DSPPFM FILE(QSYSINC/SYS) MBR(STAT)
  

You can print a header file in QSYSINC by using one of the following methods:

• Using your editor. For example, to print the unistd.h header file using the Source Entry Utility editor, enter the following command:

  STRSEU SRCFILE(QSYSINC/H) SRCMBR(UNISTD) OPTION(6)
  

• Using the Copy File command. For example, to print the sys/stat.h header file, enter the following command:

  CPYF FROMFILE(QSYSINC/SYS) TOFILE(*PRINT) FROMMBR(STAT)