TRACEHOOK_SIGNAL_HAN(9) Kernel Internals TRACEHOOK_SIGNAL_HAN(9)NAME
tracehook_signal_handler - signal handler setup is complete
SYNOPSIS
void tracehook_signal_handler(int sig, siginfo_t * info, const struct k_sigaction * ka, struct pt_regs * regs, int stepping);
ARGUMENTS
sig
number of signal being delivered
info
siginfo_t of signal being delivered
ka
sigaction setting that chose the handler
regs
user register state
stepping
nonzero if debugger single-step or block-step in use
DESCRIPTION
Called by the arch code after a signal handler has been set up. Register and stack state reflects the user handler about to run. Signal
mask changes have already been made.
Called without locks, shortly before returning to user mode (or handling more signals).
Kernel Hackers Manual 2.6. July 2010 TRACEHOOK_SIGNAL_HAN(9)
Check Out this Related Man Page
sigvec(2) System Calls Manual sigvec(2)NAME
sigvec - Provides a compatibility interface to the sigaction() function
SYNOPSIS
#include <sys/signal.h> int sigvec ( int signal, struct sigvec *in_vec, struct sigvec *out_vec );
PARAMETERS
Specifies the signal number. Points to a sigvec() structure that specifies the action to be taken when the specified signal is delivered,
the mask to be used when calling the signal handler, and the flags that modify signal behavior. Points to a sigvec() structure that is set
to the previous signal action state on successful return from the sigvec() function.
DESCRIPTION
The sigvec() function is provided for compatibility to old UNIX systems; its function is a subset of that available with the sigaction()
function. Like the sigaction() function, the sigvec() function allows the user to set the action to take upon the receipt of a signal and
to specify a signal handler mask to block signals before calling the signal handler. However, only signals with values 1 to 31 can be
masked on entry to a signal-handler set up with the sigvec() function.
The sigvec() structure has the following members: void (*sv_handler)( ); int sv_mask; int sv_flags;
The sv_handler field specifies the action for the signal, and can be SIG_DFL, SIG_IGN, or the address of a signal handler function. See the
sigaction() function for a detailed description of the signal actions.
The sv_mask field specifies a mask which specifies signals to block (in addition to any signals already blocked at time of delivery) when
the signal handler function is called for the signal. Signal i is blocked if the i-th bit of the mask is set. Only signals with values 1
to 31 can be masked with the sigvec() function. The sv_flags field contains flags that further specify signal behavior. If SV_ONSTACK is
set, the signal handler runs on the signal stack specified by the sigstack() function; otherwise, the signal handler runs on the stack of
the process receiving the signal. If SV_INTERRUPT is set, a system call that is interrupted by signal returns a value of -1 with errno set
to [EINTR]; otherwise, a system call interrupted by signal is restarted.
If the value of the in_vec parameter is a null pointer, then the signal handler information is not set. If the value of the out_vec parame-
ter is null, then the previous signal handler information is not returned.
Once a signal handler is assigned, it remains assigned until another call to the sigvec(), signal(), sigaction(), or exec function is made.
NOTES
The sigvec() function is provided for compatibility only, and its use is not recommended. Programs should use the sigaction() function
instead.
The sigvec() function does not check the validity of the sv_handler field pointer. If it points to a location outside of the process
address space, the process receives a memory fault when the system attempts to call the signal handler. If the sv_handler field points to
anything other than a function, the results are unpredictable.
The signal-handler function can be declared as follows: void handler ( int signal );
RETURN VALUES
Upon successful completion, a value of 0 (zero) is returned. If the sigvec() function fails, a value of -1 is returned and errno is set to
indicate the error.
ERRORS
If the sigvec() function fails, no new signal handler is installed and errno may be set to one of the following values: The in_vec or
out_vec parameter points to a location outside of the process' address space. The signal parameter is not a valid signal number. An
attempt was made to ignore or supply a handler for the SIGKILL signal.
RELATED INFORMATION
Functions: kill(2), ptrace(2), sigaction(2), sigblock(2), sigpause(3), sigstack(2) delim off
sigvec(2)