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git.ipfire.org Git - thirdparty/squid.git/blob - tools/purge/signal.cc
4 // Author: Jens-S. V?ckler <voeckler@rvs.uni-hannover.de>
6 // Date: Sat Feb 28 1998
7 // Compiler: gcc 2.7.2.x series
9 // Books: W. Richard Steven, "Advanced Programming in the UNIX Environment",
10 // Addison-Wesley, 1992.
12 // (c) 1998 Lehrgebiet Rechnernetze und Verteilte Systeme
13 // Universit?t Hannover, Germany
15 // Permission to use, copy, modify, distribute, and sell this software
16 // and its documentation for any purpose is hereby granted without fee,
17 // provided that (i) the above copyright notices and this permission
18 // notice appear in all copies of the software and related documentation,
19 // and (ii) the names of the Lehrgebiet Rechnernetze und Verteilte
20 // Systeme and the University of Hannover may not be used in any
21 // advertising or publicity relating to the software without the
22 // specific, prior written permission of Lehrgebiet Rechnernetze und
23 // Verteilte Systeme and the University of Hannover.
25 // THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
26 // EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
27 // WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
29 // IN NO EVENT SHALL THE LEHRGEBIET RECHNERNETZE UND VERTEILTE SYSTEME OR
30 // THE UNIVERSITY OF HANNOVER BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
31 // INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES
32 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT
33 // ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY,
34 // ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
37 // Revision 1.3 1999/01/19 13:11:52 cached
38 // adaptations necessary for AIX.
40 // Revision 1.2 1999/01/19 11:00:50 voeckler
41 // added psignal(int,const char*) compatibility function.
43 // Revision 1.1 1998/08/13 21:51:58 voeckler
48 #if defined(__GNUC__) || defined(__GNUG__)
49 #pragma implementation
55 //#include <sys/types.h>
65 Signal( int signo
, SigFunc
* newhandler
, bool doInterrupt
)
66 // purpose: install reliable signals
67 // paramtr: signo (IN): signal for which a handler is to be installed
68 // newhandler (IN): function pointer to the signal handler
69 // doInterrupt (IN): interrupted system calls wanted!
70 // returns: the old signal handler, or SIG_ERR in case of error.
72 struct sigaction action
, old
;
74 memset( &old
, 0, sizeof(old
) );
75 memset( &action
, 0, sizeof(action
) );
77 // action.sa_handler = newhandler; I HATE TYPE-OVERCORRECTNESS !
78 memmove( &action
.sa_handler
, &newhandler
, sizeof(SigFunc
*) );
79 sigemptyset( &action
.sa_mask
);
81 if ( signo
== SIGCHLD
) {
82 action
.sa_flags
|= SA_NOCLDSTOP
;
85 action
.sa_flags
|= SA_NODEFER
; // SYSV: don't block current signal
89 if ( signo
== SIGALRM
|| doInterrupt
) {
91 action
.sa_flags
|= SA_INTERRUPT
; // SunOS, obsoleted by POSIX
95 action
.sa_flags
|= SA_RESTART
; // BSD, SVR4
99 return ( sigaction( signo
, &action
, &old
) < 0 ) ?
101 (SigFunc
*) old
.sa_handler
;
105 sigChild( int signo
)
106 // purpose: supply ad hoc child handler with output on stderr
107 // paramtr: signo (IN): == SIGCHLD
108 // returns: only if OS uses a return type for signal handler
109 // seealso: Stevens, UNP, figure 5.11 *and* Stevens, APUE, figure 8.3
112 int status
= signo
; // to stop GNU from complaining...
115 while ( (pid
= waitpid( -1, &status
, WNOHANG
)) > 0 ) {
116 if ( WIFEXITED(status
) ) {
117 fprintf( stderr
, "child (pid=%ld) reaped, status %d\n%c",
118 (long) pid
, WEXITSTATUS(status
), 0 );
119 } else if ( WIFSIGNALED(status
) ) {
120 fprintf( stderr
, "child (pid=%ld) died on signal %d%s\n%c",
121 (long) pid
, WTERMSIG(status
),
123 WCOREDUMP(status
) ? " (core generated)" : "",
129 fprintf( stderr
, "detected dead child (pid=%ld), status %d\n%c",
130 (long) pid
, status
, 0 );
135 #if SIGRETTYPE != void