//访问大文件 #define _LARGEFILE64_SOURCE #include <sys/stat.h> #include <fcntl.h> #include "tlpi_hdr.h" #define EXIT_SUCESS 0 int main(int argc, char *argv[]) { int fd; off64_t off; if (argc != 3 || strcmp(argv[1],"--help") == 0) usageErr("%s pathname offset\n",argv[0]); fd = open64(argv[1],O_RDWR|O_CREAT,S_IRUSR | S_IWUSR); if (fd == -1) errExit("open64"); off = atoll(argv[2]); if (lseek64(fd,off,SEEK_SET) == -1) errExit("lseek64"); if (write(fd,"test",4) == -1) errExit("write"); exit(EXIT_SUCESS); } /* 程序测试示例: [root@localhost linux-test]# gl++ test.c [root@localhost linux-test]# echo "hello world" > a.txt [root@localhost linux-test]# cat a.txt hello world [root@localhost linux-test]# ./a.out a.txt "hello world" [root@localhost linux-test]# cat a.txt testo world */
访问大文件
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