static int
proc_usage(pid_t pid, prusage_t *pup, int *perr)
{
int fd;
*perr = G_NOPROC;
if ((fd = open_usage(pid, perr)) != -1) {
if (read(fd, pup, sizeof (prusage_t)) == sizeof (prusage_t)) {
*perr = 0;
(void) close(fd);
return (0);
}
/*
* If the read failed, the process may have gone away.
*/
(void) close(fd);
}
return (-1);
}
int main( int argc, char *argv[] ){
int err;
int c;
int ret;
int fd;
while(-1 != (ret = getopt(argc,argv,"r:h:")) ){
switch(ret) {
case 'r' :
printf("The argument of -b is %s\n",optarg);
if( strcmp("open",optarg) == 0 ) c = '1'; else
if( strcmp("creat",optarg) == 0 ) c = '2'; else
if( strcmp("close",optarg) == 0 ) c = '3'; else
if( strcmp("lseek",optarg) == 0 ) c = '4'; else
if( strcmp("read",optarg) == 0 ) c = '5'; else
if( strcmp("write",optarg) == 0 ) c = '6'; else
if( strcmp("fcntl",optarg) == 0 ) c = '7'; else
if((strcmp("sync",optarg) & strcmp("fsync",optarg) & strcmp("fdatasync",optarg)) == 0) c = '8';
switch(c) {
case '1' : //r:open
printf("R:open\n");
fd = open("./open.txt",O_RDWR | O_CREAT | O_EXCL, S_IRWXU); //打开文件，不存在创建，设置权限
if( fd == -1) printf("cant open open.txt\n");
write(fd,"open",4); //写open到文件
close(fd); //关闭文件
break;
case '2' : //r:creat
printf("R:create\n");
err = creat("./create.txt",0777);
if( err == -1 ) printf("cant create create.txt");
fd = open("./create.txt",O_WRONLY);
write(fd,"create",6);
close(fd);
break;
case '3' : //r:close
printf("R:close\n");
fd = open("./close.txt",O_WRONLY | O_CREAT | O_EXCL, S_IRWXU);
write(fd,"close",5);
close(fd);
break;
case '4' : //r:lseek
printf("R:lseek\n");
fd = open("./lseek.txt",O_WRONLY | O_CREAT | O_EXCL, S_IRWXU);
write(fd,"lseek",5);
close(fd);
fd = open("./lseek.txt",O_RDWR);
ret = lseek(fd,-4,SEEK_END);
write(fd,"lseek",5);
close(fd);
break;
case '5' : //r:read
printf("R:read\n");
char buf[10];
fd = open("./read.txt",O_WRONLY | O_CREAT | O_EXCL, S_IRWXU);
write(fd,"read",4);
close(fd);
fd = open("./read.txt",O_RDWR);
ret = lseek(fd, -2, SEEK_END);
read(fd,buf,10);
printf("read from read.txt is %s\n",buf);
close(fd);
break;
case '6' : //r:write
printf("R:write\n");
fd = open("./write.txt",O_WRONLY | O_CREAT | O_EXCL, S_IRWXU);
write(fd,"write",5);
close(fd);
break;
case '7' : //r:fcntl
//fd = open("./fcntl.txt",O_WRONLY | O_CREAT | O_EXCL, S_IRWXU);
//ret= fcntl(fd,F_GETFD); printf("current descriptor flags: %d\n",ret);
//ret= fcntl(fd,F_SETFD,1);
break;
case '8' :
break;
default :
printf("R:err::the argumetn is not included in {open,creat,close,lseek,read,write}\n");
break;
}//endl-switch(optarg)
break;
case 'h' :
printf("The argument of -b is %s\n\n",optarg);
if( strcmp("open",optarg) == 0 ) c = '1'; else
if( strcmp("creat",optarg) == 0 ) c = '2'; else
if( strcmp("close",optarg) == 0 ) c = '3'; else
if( strcmp("lseek",optarg) == 0 ) c = '4'; else
if( strcmp("read",optarg) == 0 ) c = '5'; else
if( strcmp("write",optarg) == 0 ) c = '6'; else
if( strcmp("fcntl",optarg) == 0 ) c = '7'; else
if((strcmp("sync",optarg) & strcmp("fsync",optarg) & strcmp("fdatasync",optarg)) == 0) c = '8';
switch(c) {
case '1' : //h:open
open_usage();
break;
case '2' : //h:creat
creat_usage();
break;
case '3' : //h:close
close_usage();
break;
case '4' : //h:lseek
lseek_usage();
break;
case '5' : //h:read
read_usage();
break;
case '6' : //h:write
write_usage();
break;
case '7' : //h:fcntl
fcntl_usage();
break;
case '8' : //h:sync
sync_usage();
break;
default : //-h
fileIO_usage();
break;
}
break;
default: //-h
fileIO_usage();
break;
} //endl-switch(ret)
} //endl-while(getopt)
}//endl-main
