?? sleep.c
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#include<stdio.h>#include<signal.h>#include<sys/time.h>#include<errno.h>#include<setjmp.h>#include<string.h>#include<stdlib.h>#include<unistd.h>unsigned int sleep(unsigned int );//returns:0 or number of seconds main(int argc,char **argv){ int n,i; if(argc<2) { fprintf(stderr,"Usage: %s <period(S)>\n"); exit(0); } for(i=1;i<argc;i++) { if(sscanf(argv[1],"%d",&n)!=1) { printf("Not a valid number\n"); exit(225); } sleep(n); n=0; } return 0;}
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