52 lines
956 B
C
52 lines
956 B
C
#include "types.h"
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#include "stat.h"
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#include "user.h"
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#include "fcntl.h"
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int
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main()
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{
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char buf[512];
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int fd, i, sectors;
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fd = open("big.file", O_CREATE | O_WRONLY);
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if(fd < 0){
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printf(2, "big: cannot open big.file for writing\n");
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exit();
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}
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sectors = 0;
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while(1){
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*(int*)buf = sectors;
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int cc = write(fd, buf, sizeof(buf));
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if(cc <= 0)
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break;
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sectors++;
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if (sectors % 100 == 0)
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printf(2, ".");
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}
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printf(1, "\nwrote %d sectors\n", sectors);
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close(fd);
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fd = open("big.file", O_RDONLY);
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if(fd < 0){
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printf(2, "big: cannot re-open big.file for reading\n");
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exit();
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}
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for(i = 0; i < sectors; i++){
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int cc = read(fd, buf, sizeof(buf));
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if(cc <= 0){
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printf(2, "big: read error at sector %d\n", i);
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exit();
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}
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if(*(int*)buf != i){
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printf(2, "big: read the wrong data (%d) for sector %d\n",
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*(int*)buf, i);
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exit();
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}
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}
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exit();
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}
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