要调用C例程'lseek',你需要按照以下步骤进行: 引入头文件:在你的代码中,首先需要引入头文件<unistd.h>,该头文件包含了'lseek'函数的声明。 打开文件:使用C语言中的文件操作函数(如open)打开你想要进行文件定位的文件。例如,你可以使用open函数来打开一个文件,并将返回的文件描述符保存在一个整型变量中。 使用'ls...
使用示例: #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <sys/types.h> #include <sys/stat.h> int main() { int fd = open("example.txt", O_RDONLY); // 打开文件 if (fd == -1) { perror("open"); exit(1); } off_t offset = l...
#include <stdio.h> #include <unistd.h> int main() { int fd = open("example.txt", O_RDWR); // 打开文件 if (fd == -1) { perror("open"); return 1; } off_t pos = lseek(fd, 10, SEEK_SET); // 将文件指针移动到第10个字节处 if (pos == -1) { perror("lseek"); close...
Example // crt_lseek.c /* This program first opens a file named lseek.txt. * It then uses _lseek to find the beginning of the file, * to find the current position in the file, and to find * the end of the file. */ #include <io.h> #include <fcntl.h> #include <stdlib.h>...
executable, "-c", 'import sys; sys.exit(sys.stdin.read() == "pear")'], stdin=d) p.wait() self.assertEqual(p.returncode, 1) Example #23Source File: test_largefile.py From Fluid-Designer with GNU General Public License v3.0 5 votes def test_lseek(self): with self.open(TESTFN...
}if(argc !=3) {fprintf(stderr,"Invalid number of arguments\n""Format : $./directio <partition> <file>\n""Example : $./directio /dev/sda1 ~/test.dump\n");gotoerr; }/* open partition */disk = open(argv[1], O_RDONLY | O_DIRECT | O_LARGEFILE);if(disk <=0) {fprintf(std...
In this article, we will discuss thelseek() functionwith its syntax, parameter, example, advantages, and disadvantages. lseek ()is a function in the C programming language that permits you to move the file pointer to a detailed position within a report. Therecord pointerrepresents thepresent-da...
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For example, a file might have a physical size of 100 bytes, but after an application has read 100 bytes from the file, the current file offset may be only 50. To read the whole file, the application might have to read 200 bytes or more, depending on the CCSIDs involved. Therefore,...
(), several functions originally derived from the ISO C standard, such as fwrite(), fprintf(), and so on, may do so (by causing calls on write()). An invalid file offset that would cause [EINVAL] to be returned may be both implementation-defined and device-dependent (for example, ...