12-05-2005
difference between int ** func() and int *& func()
What is the difference between int** func() and int*& func(). Can you please explain it with suitable example.
Thanks,
Devesh.
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LEARN ABOUT MOJAVE
bsd_signal
BSD_SIGNAL(3) BSD Library Functions Manual BSD_SIGNAL(3)
NAME
bsd_signal -- simplified signal facilities
SYNOPSIS
#include <signal.h>
void (*
bsd_signal(int sig, void (*func)(int)))(int);
or in an equivalent but easier to read typedef'd version:
typedef void (*sig_t) (int);
sig_t
bsd_signal(int sig, sig_t func);
DESCRIPTION
The bsd_signal() function provides a partially compatible interface for programs written to historical system interfaces (see USAGE below).
The function call bsd_signal(sig, func) has the effect as if implemented as:
void (*bsd_signal(int sig, void (*func)(int)))(int)
{
struct sigaction act, oact;
act.sa_handler = func;
act.sa_flags = SA_RESTART;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, sig);
if (sigaction(sig, &act, &oact) == -1)
return(SIG_ERR);
return(oact.sa_handler);
}
The handler function should be declared:
void func(int sig)
where sig is the signal number. The behavior is undefined if func() is a function that takes more than one argument, or an argument of a
different type.
RETURN VALUES
Upon successful completion, bsd_signal() returns the previous action for sig. Otherwise, SIG_ERR is returned and errno is set to indicate
the error.
ERRORS
Refer to sigaction(2).
USAGE
This function is a direct replacement for the BSD signal(3) function for simple applications that are installing a single-argument signal
handler function. If a BSD signal handler function is being installed that expects more than one argument, the application has to be modi-
fied to use sigaction(2). The bsd_signal() function differs from signal(3) in that the SA_RESTART flag is set and the SA_RESETHAND will be
clear when bsd_signal() is used. The state of these flags is not specified for signal(3).
SEE ALSO
sigaction(2), sigaddset(3), sigemptyset(3), signal(3)
STANDARDS
The bsd_signal() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
BSD
December 20, 2003 BSD