Add additional event-handling files

darcs-hash:20051006073050-ac50b-aa386de02dab1b3b20d7cc3d8c6b6ad1be681f5d.gz

signal.c

@@ -0,0 +1,412 @@
+/** \file signal.c
+
+The library for various signal related issues
+
+*/
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <dirent.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "signal.h"
+#include "event.h"
+#include "reader.h"
+#include "proc.h"
+
+/**
+   Struct describing an entry for the lookup table used to convert
+   between signal names and signal ids, etc.
+*/
+struct lookup_entry
+{
+	/**
+	   Signal id
+	*/
+	int signal;
+	/**
+	   Signal name
+	*/
+	const wchar_t *name;
+	/**
+	   Signal description
+	*/
+	const wchar_t *desc;	
+};
+
+/**
+   Lookup table used to convert between signal names and signal ids,
+   etc.
+*/
+static struct lookup_entry lookup[] =
+{
+	{
+		SIGHUP, 
+		L"SIGHUP",
+		L"Terminal hung up"
+	}
+	,
+	{
+		SIGINT,
+		L"SIGINT",
+		L"Quit request from job control (^C)"
+	}
+	,
+	{
+		SIGQUIT,
+		L"SIGQUIT",
+		L"Quit request from job control with core dump (^\\)"
+	}
+	,
+	{
+		SIGILL,
+		L"SIGILL",
+		L"Illegal instruction"
+	}
+	,
+	{
+		SIGTRAP, 
+		L"SIGTRAP",
+		L"Trace or breakpoint trap"
+	}
+	,
+	{
+		SIGABRT,
+		L"SIGABRT",
+		L"Abort"
+	}
+	,
+	{
+		SIGBUS, 
+		L"SIGBUS",
+		L"Misaligned address error"
+	}
+	,
+	{
+		SIGFPE, 
+		L"SIGFPE",
+		L"Floating point exception"
+	}
+	,
+	{
+		SIGKILL, 
+		L"SIGKILL",
+		L"Forced quit"
+	}
+	,
+	{
+		SIGUSR1,
+		L"SIGUSR1",
+		L"User defined signal 1"
+	}
+	,
+	{
+		SIGUSR2, L"SIGUSR2",
+		L"User defined signal 2"
+	}
+	,
+	{
+		SIGSEGV, 
+		L"SIGSEGV",
+		L"Address boundary error"
+	}
+	,
+	{
+		SIGPIPE,
+		L"SIGPIPE",
+		L"Broken pipe"
+	}
+	,
+	{
+		SIGALRM, 
+		L"SIGALRM",
+		L"Timer expired"
+	}
+	,
+	{
+		SIGTERM,
+		L"SIGTERM",
+		L"Polite quit request"
+	}
+	,
+	{
+		SIGCHLD,
+		L"SIGCHLD",
+		L"Child process status changed"
+	}
+	,
+	{
+		SIGCONT,
+		L"SIGCONT",
+		L"Continue previously stopped process"
+	}
+	,
+	{
+		SIGSTOP,
+		L"SIGSTOP",
+		L"Forced stop"
+	}
+	,
+	{
+		SIGTSTP,
+		L"SIGTSTP",
+		L"Stop request from job control (^Z)"
+	}
+	,
+	{
+		SIGTTIN, 
+		L"SIGTTIN",
+		L"Stop from terminal input"
+	}
+	,
+	{
+		SIGTTOU,
+		L"SIGTTOU",
+		L"Stop from terminal output"
+	}
+	,
+	{
+		SIGURG, 
+		L"SIGURG",
+		L"Urgent socket condition"
+	}
+	,
+	{
+		SIGXCPU,
+		L"SIGXCPU",
+		L"CPU time limit exceeded"
+	}
+	,
+	{
+		SIGXFSZ, 
+		L"SIGXFSZ",
+		L"File size limit exceeded"
+	}
+	,
+	{
+		SIGVTALRM,
+		L"SIGVTALRM",
+		L"Virtual timer expired"
+	}
+	,
+	{
+		SIGPROF,
+		L"SIGPROF",
+		L"Profiling timer expired"
+	}
+	,
+	{
+		SIGWINCH,
+		L"SIGWINCH",
+		L"Window size change"
+	}
+	,
+	{
+		SIGIO,
+		L"SIGIO",
+		L"Asynchronous IO event"
+	}
+	,
+#ifdef SIGPWR
+	{
+		SIGPWR, 
+		L"SIGPWR",
+		L"Power failure"
+	}
+	,
+#endif
+	{
+		SIGSYS, 
+		L"SIGSYS",
+		L"Bad system call"
+	}
+	,
+	{
+		0,
+		0,
+		0
+	}
+}
+	;
+
+
+/**
+   Test if \c name is a string describing the signal named \c canonical. 
+*/
+static int match_signal_name( const wchar_t *canonical, 
+							  const wchar_t *name )
+{
+	if( wcsncasecmp( name, L"sig", 3 )==0)
+		name +=3;
+
+	return wcscasecmp( canonical+3,name ) == 0;	
+}
+
+
+int wcs2sig( const wchar_t *str )
+{
+	int i;
+	for( i=0; lookup[i].desc ; i++ )
+	{
+		if( match_signal_name( lookup[i].name, str) )
+		{
+			return lookup[i].signal;
+		}
+	}
+	return -1;	
+}
+
+
+const wchar_t *sig2wcs( int sig )
+{
+	int i;
+	for( i=0; lookup[i].desc ; i++ )
+	{
+		if( lookup[i].signal == sig )
+		{
+			return lookup[i].name;
+		}
+	}
+	return L"Unknown";
+}
+
+const wchar_t *sig_description( int sig )
+{
+	int i;
+	for( i=0; lookup[i].desc ; i++ )
+	{
+		if( lookup[i].signal == sig )
+		{
+			return lookup[i].desc;
+		}
+	}
+	return L"Unknown";
+}
+
+static void default_handler(int signal, siginfo_t *info, void *context)
+{
+	event_t e;
+	e.type=EVENT_SIGNAL;
+	e.signal = signal;
+	e.function_name=0;
+
+	event_fire( &e, 0 );
+}
+
+/**
+   Respond to a winch signal by checking the terminal size
+*/
+static void handle_winch( int sig, siginfo_t *info, void *context )
+{
+	reader_handle_winch( sig );	
+	default_handler( sig, 0, 0 );	
+}
+
+/**
+   Interactive mode ^C handler. Respond to int signal by setting
+   interrupted-flag and stopping all loops and conditionals.
+*/
+static void handle_int( int sig, siginfo_t *info, void *context )
+{
+	reader_handle_int( sig );
+
+	default_handler( sig, info, context);	
+}
+
+/**
+   Sets appropriate signal handlers.
+*/
+void signal_set_handlers()
+{
+	struct sigaction act;
+	sigemptyset( & act.sa_mask );
+	act.sa_flags=SA_SIGINFO;
+	act.sa_sigaction = &default_handler;
+
+	/*
+	  First reset everything to a use default_handler, a function
+	  whose sole action is to fire of an event
+	*/
+	sigaction( SIGINT, &act, 0);
+	sigaction( SIGQUIT, &act, 0);
+	sigaction( SIGTSTP, &act, 0);
+	sigaction( SIGTTIN, &act, 0);
+	sigaction( SIGTTOU, &act, 0);
+	sigaction( SIGCHLD, &act, 0);
+	sigaction( SIGALRM, &act, 0);
+
+	/*
+	  Ignore sigpipe, it is generated if fishd dies, but we can
+	  recover.
+	*/
+	sigaction( SIGPIPE, &act, 0);
+	
+	if( is_interactive )
+	{
+
+		/*
+		   Interactive mode. Ignore interactive signals.  We are a
+		   shell, we know whats best for the user. ;-)
+		*/
+
+		act.sa_handler=SIG_IGN;
+
+		sigaction( SIGINT, &act, 0);
+		sigaction( SIGQUIT, &act, 0);
+		sigaction( SIGTSTP, &act, 0);
+		sigaction( SIGTTIN, &act, 0);
+		sigaction( SIGTTOU, &act, 0);
+
+		act.sa_handler = &handle_int;
+		act.sa_flags = SA_SIGINFO;
+		if( sigaction( SIGINT, &act, 0) )
+		{
+			wperror( L"sigaction" );
+			exit(1);
+		}
+
+		act.sa_sigaction = &job_handle_signal;
+		act.sa_flags = SA_SIGINFO;
+		if( sigaction( SIGCHLD, &act, 0) )
+		{
+			wperror( L"sigaction" );
+			exit(1);
+		}
+
+		act.sa_flags = SA_SIGINFO;
+		act.sa_handler= &handle_winch;
+		if( sigaction( SIGWINCH, &act, 0 ) )
+		{
+			wperror( L"sigaction" );
+			exit(1);
+		}
+
+	}
+	else
+	{
+		/*
+		  Non-interactive. Ignore interrupt, check exit status of
+		  processes to determine result instead.
+		*/
+		act.sa_handler=SIG_IGN;
+
+		sigaction( SIGINT, &act, 0);
+		sigaction( SIGQUIT, &act, 0);
+
+		act.sa_handler=SIG_DFL;
+
+		act.sa_sigaction = &job_handle_signal;
+		act.sa_flags = SA_SIGINFO;
+		if( sigaction( SIGCHLD, &act, 0) )
+		{
+			wperror( L"sigaction" );
+			exit(1);
+		}
+	}
+}
+

signal.h

@@ -0,0 +1,23 @@
+/** \file signal.h
+
+The library for various signal related issues
+
+*/
+
+/**
+   Get the integer signal value representing the specified signal, or
+   -1 of no signal was found
+*/
+int wcs2sig( const wchar_t *str );
+
+/**
+   Get string representation of a signal
+*/
+const wchar_t *sig2wcs( int sig );
+
+/**
+   Returns a description of the specified signal.
+*/
+const wchar_t *sig_description( int sig );
+
+void signal_set_handlers();