34 lines
580 B
C
34 lines
580 B
C
#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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int main(int argc, char **argv)
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{
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if (argc < 2)
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{
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fprintf(stderr, "Usage:...\n");
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exit(1);
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}
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int fd;
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fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0600);
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if (fd < 0)
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{
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perror("open()");
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exit(1);
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}
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// 生成一个5G的文件
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// !!! 整数溢出
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lseek(fd, 5LL * 1024LL * 1024LL * 1024LL - 1LL, SEEK_SET);
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// 写入尾0
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write(fd, "", 1);
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close(fd);
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exit(0);
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} |