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psignal(9r) [osf1 man page]

psignal(9r)															       psignal(9r)

NAME
psignal - General: Sends a signal to a process SYNOPSIS
void psignal( struct proc *process, int signal ); ARGUMENTS
Specifies a pointer to a proc structure. Specifies the signal that you want to send to the specified process. You can specify any of the signals defined in /usr/sys/include/sys/signal.h. DESCRIPTION
The psignal routine posts a signal to the specified process. The posting of a signal causes that signal to be added to the set of pending signals for the specified process. Depending on the state of the process and the state of the process's signals, the specified signal may be ignored, masked, caught by a tracing parent, or caught by the actual target process. If the signal is to be delivered to the target process, psignal examines and modifies the process state to prepare the execution of the appropriate signal handler. RETURN VALUES
None SEE ALSO
Routines: gsignal(9r) psignal(9r)

Check Out this Related Man Page

PSIGNAL(9)						   BSD Kernel Developer's Manual						PSIGNAL(9)

NAME
psignal, pgsignal, gsignal -- post signal to a process or process group SYNOPSIS
#include <sys/types.h> #include <sys/signalvar.h> void psignal(struct proc *p, int signum); void pgsignal(struct pgrp *pgrp, int signum, int checkctty); void gsignal(int pgid, int signum); DESCRIPTION
These functions post a signal to one or more processes. The argument signum common to all three functions should be in the range [1-NSIG]. The psignal() function posts signal number signum to the process represented by the process structure p. With a few exceptions noted below, the target process signal disposition is updated and is marked as runnable, so further handling of the signal is done in the context of the target process after a context switch. Note that psignal() does not by itself cause a context switch to happen. The target process is not marked as runnable in the following cases: o The target process is sleeping uninterruptibly. The signal will be noticed when the process returns from the system call or trap. o The target process is currently ignoring the signal. o If a stop signal is sent to a sleeping process that takes the default action (see sigaction(2)), the process is stopped without awakening it. o SIGCONT restarts a stopped process (or puts them back to sleep) regardless of the signal action (e.g., blocked or ignored). If the target process is being traced psignal() behaves as if the target process were taking the default action for signum. This allows the tracing process to be notified of the signal. The pgsignal() function posts signal number signum to each member of the process group described by pgrp. If checkctty is non-zero, the sig- nal will be posted only to processes that have a controlling terminal. pgsignal() is implemented by walking along the process list headed by the field pg_members of the process group structure pointed at by pgrp and calling psignal() as appropriate. If pgrp is NULL no action is taken. The gsignal() function posts signal number signum to each member of the process group identified by the group id pgid. gsignal() first finds the group structure associated with pgid, then invokes pgsignal() with the argument checkctty set to zero. If pgid is zero no action is taken. SEE ALSO
sigaction(2), signal(9), tsleep(9) BSD
June 22, 1996 BSD
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