Return to signal_.c CVS log

Up to [CSRG BSD Unix] / 43BSD / usr.lib / libF77

Annotation of 43BSD/usr.lib/libF77/signal_.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)signal_.c   5.3     9/11/85
                      7:  *
                      8:  * change the action for a specified signal
                      9:  *
                     10:  * calling sequence:
                     11:  *     integer cursig, signal, savsig
                     12:  *     external proc
                     13:  *     cursig = signal(signum, proc, flag)
                     14:  * where:
                     15:  *     'cursig' will receive the current value of signal(2)
                     16:  *     'signum' must be in the range 0 <= signum <= 32
                     17:  *
                     18:  *     If 'flag' is negative, 'proc' must be an external proceedure name.
                     19:  *     
                     20:  *     If 'flag' is 0 or positive, it will be passed to signal(2) as the
                     21:  *     signal action flag. 0 resets the default action; 1 sets 'ignore'.
                     22:  *     'flag' may be the value returned from a previous call to signal.
                     23:  *
                     24:  * This routine arranges to trap user specified signals so that it can
                     25:  * pass the signum fortran style - by address. (boo)
                     26:  */
                     27: 
                     28: #include       "../libI77/f_errno.h"
                     29: 
                     30: static int (*dispatch[33])();
                     31: int (*signal())();
                     32: int sig_trap();
                     33: 
                     34: long signal_(sigp, procp, flag)
                     35: long *sigp, *flag;
                     36: int (*procp)();
                     37: {
                     38:        int (*oldsig)();
                     39:        int (*oldispatch)();
                     40: 
                     41:        oldispatch = dispatch[*sigp];
                     42: 
                     43:        if (*sigp < 0 || *sigp > 32)
                     44:                return(-((long)(errno=F_ERARG)));
                     45: 
                     46:        if (*flag < 0)  /* function address passed */
                     47:        {
                     48:                dispatch[*sigp] = procp;
                     49:                oldsig = signal((int)*sigp, sig_trap);
                     50:        }
                     51: 
                     52:        else            /* integer value passed */
                     53:                oldsig = signal((int)*sigp, (int)*flag);
                     54: 
                     55:        if (oldsig == sig_trap)
                     56:                return((long)oldispatch);
                     57:        return((long)oldsig);
                     58: }
                     59: 
                     60: sig_trap(sn)
                     61: int sn;
                     62: {
                     63:        long lsn = (long)sn;
                     64:        return((*dispatch[sn])(&lsn));
                     65: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.