iOS SWIFT application - How to ignore SIGPIPE signal globally?

Question

I am trying to ignore SIGPIPE signal that is thrown by a third party SDK I am using in my Swift application. How do I make my application ignore SIGPIPE signal globally?

Answer 1

The syntax is the same as in a C program:

signal(SIGPIPE, SIG_IGN)

The problem is that SIG_IGN is not defined in Swift. For C programs, it is defined in <sys/signal.h> as

#define SIG_IGN     (void (*)(int))1

but this integer to pointer conversion is not imported into Swift, so you have to define it yourself:

let SIG_IGN = CFunctionPointer<((Int32) -> Void)>(COpaquePointer(bitPattern: 1))
signal(SIGPIPE, SIG_IGN)

For Swift 2 (Xcode 7) the following should work:

typealias SigHandler = @convention(c) (Int32) -> Void
let SIG_IGN = unsafeBitCast(COpaquePointer(bitPattern: 1), SigHandler.self)
signal(SIGPIPE, SIG_IGN)

As of Swift 2.1 (Xcode 7.1), SIG_IGN is defined as a public property and you can simply write

signal(SIGPIPE, SIG_IGN)