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Encode PDF-417 2d barcode in Objective-C Function Reference

Function Reference
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IPC_STAT IPC_SET
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Places the current value of each member of the data structure associated with ID into the scalar ARG Sets the value of the following members of the data structure associated with ID to the corresponding values found in the packed scalar ARG Removes the shared memory identifier specified by ID from the system and destroys the shared memory segment and data structure associated with it Locks the shared memory segment specified by ID in memory
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SHM_UNLOCK Unlocks the shared memory segment specified by ID Table A-14
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Commands for Controlling Shared Memory Segments
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Effects Returns in Scalar Context undef on failure 0 but true if the return value from the shmctl( ) is 0 Value returned by system See also (s) 14 Function(s)
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$!, U Returns in List Context
Module(s) IPC::SysV
shmget, shmread
shmget
shmget KEY, SIZE, FLAGS shmget KEY APPENDIXES
Returns the shared memory segment ID for the segment matching KEY A new shared memory segment is created of at least SIZE bytes, providing that either KEY does not
Perl: The Complete Reference
already have a segment associated with it or that KEY is equal to the constant IPC_PRIVATE Effects Returns in Scalar Context Shared memory ID See also (s) 14 Function(s) Module(s) shmctl, shmread, shmwrite IPC::SysV $!, U Returns in List Context
shmread
shmread ID, VAR, POS, SIZE
Reads the shared memory segment ID into the scalar VAR at position POS for up to SIZE bytes Effects Returns in Scalar Context 0 on failure 1 on success See also (s) 14 Function(s) shmctl, shmget, shmwrite Module(s) IPC::SysV $!, U Returns in List Context
shmwrite
shmwrite ID, STRING, POS, SIZE
Writes STRING from the position POS for SIZE bytes into the shared memory segment specified by ID The SIZE is greater than the length of STRING shmwrite appends null bytes to fill out to SIZE bytes
Appendix A:
Function Reference
Effects Returns in Scalar Context 0 on false 1 on success See also (s) 14 Function(s)
$!, U Returns in List Context
Module(s) IPC::SysV
shmctl, shmget, shmread
shutdown
shutdown SOCKET, HOW
Disables a socket connection according to the value of HOW The valid values for HOW are identical to the system call of the same name A value of 0 indicates that you have stopped reading information from the socket A value of 1 indicates that you ve stopped writing to the socket A value of 2 indicates that you have stopped using the socket altogether Effects Returns in Scalar Context 0 on failure 1 on success See also (s) 12 Function(s) accept Module(s) IO::Socket $!, XA, U Returns in List Context
sin EXPR sin APPENDIXES
Perl: The Complete Reference
Returns the sine of EXPR, or $_ if not specified Effects Returns in Scalar Context Floating point See also (s) 8 Function(s) atan2, cos Module(s) Math::Trig $_ Returns in List Context
sleep
sleep EXPR sleep
Pauses the script for EXPR seconds, or forever if EXPR is not specified Returns the number of seconds actually slept Can be interrupted by a signal handler, but you should avoid using sleep with alarm, since many systems use alarm for the sleep implementation Effects Returns in Scalar Context Integer, number of seconds actually slept See also (s) 14 Function(s) alarm, select Module(s) IO::Select None Returns in List Context
socket
socket SOCKET, DOMAIN, TYPE, PROTOCOL
Opens a socket in DOMAIN, of TYPE, using PROTOCOL, and attaches it to the filehandle SOCKET You will need to import the Socket module to get the correct definitions For most systems, DOMAIN will be PF_INET for a TCP/IP-based socket TYPE will generally be one of SOCK_STREAM for streams-based connections (TCP/IP) or SOCK_DGRAM for a datagram connection (UDP/IP) Values for PROTOCOL are system defined, but valid values include TCP for TCP/IP, UDP for UDP, and RDP for the reliable datagram protocol
Appendix A:
Function Reference
Consider using the IO::Socket module instead to create both client and server sockets, since it handles all of this detail for you Effects Returns in Scalar Context 0 on failure 1 on success See also (s) 12 Function(s) accept, bind Module(s) IO::Socket $!, XA, XT, U Returns in List Context
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