#include <stdio.h> #define PAUSESIG 15 s_paus(s, n) char *s; long int n; { int i; int waitpause(); fprintf(stderr, "PAUSE "); if(n > 0) for(i = 0; i<n ; ++i) putc(*s++, stderr); fprintf(stderr, " statement executed\n"); if( isatty(fileno(stdin)) ) { fprintf(stderr, "To resume execution, type go. Any other input will terminate job.\n"); if( getchar()!='g' || getchar()!='o' || getchar()!='\n' ) { fprintf(stderr, "STOP\n"); f_exit(); exit(0); } } else { fprintf(stderr, "To resume execution, execute a kill -%d %d command\n", PAUSESIG, getpid() ); signal(PAUSESIG, waitpause); pause(); } fprintf(stderr, "Execution resumes after PAUSE.\n"); } static waitpause() { return; }