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很奇怪的现象，以RDWR打开文件权限为----------
以WRONLY打开文件权限为---------x
------解决方案--------------------
在你的程序的原有基础上加上<io.h>和<errno.h>头文件，用上面那两个标志位试下。行不行试下就知道了。
------解决方案--------------------
if( fd = creat("file.hole", O_WRONLY) == -1),话说这不是少了个括号么-。-，这fd要不是0要不就是1呀
------解决方案--------------------
看了一下手册，你的参数值的确是取错了.函数原型int creat(const char *pathname, mode_t mode);mode的取值是
S_IRWXU， 00700 user (file owner) has read, write and execute permission
S_IRUSR 00400 user has read permission
S_IWUSR 00200 user has write permission
S_IXUSR 00100 user has execute permission
S_IRWXG 00070 group has read, write and execute permission
S_IRGRP 00040 group has read permission
S_IWGRP 00020 group has write permission
S_IXGRP 00010 group has execute permission
S_IRWXO 00007 others have read, write and execute permission
S_IROTH 00004 others have read permission
S_IWOTH 00002 others have write permission
S_IXOTH 00001 others have execute permission
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
//#include <unistd.h>
char buf1[] = "abcdefghij";
char buf2[] = "ABCDEFGHIJ";
int main()
{
int fd;
//if( fd = creat("file.hole", O_RDWR) == -1)
if( fd = creat("file.hole", O_WRONLY) == -1)
perror("creat fall\n");
#if 1
if(write(fd, buf1, 10) != 10)
perror("buf1 write fall\n");
if(lseek(fd, 40, SEEK_SET) == -1)
perror("\nlseek falli");
/* offset now = 40 */
if(write(fd, buf2, 10) != 10)
perror("\nbuf2 write fall\n");
/* offset now = 50 */
#endif
putchar(10);
return 0;
}
很奇怪的现象，以RDWR打开文件权限为----------
以WRONLY打开文件权限为---------x
------解决方案--------------------
在你的程序的原有基础上加上<io.h>和<errno.h>头文件，用上面那两个标志位试下。行不行试下就知道了。
------解决方案--------------------
if( fd = creat("file.hole", O_WRONLY) == -1),话说这不是少了个括号么-。-，这fd要不是0要不就是1呀
------解决方案--------------------
看了一下手册，你的参数值的确是取错了.函数原型int creat(const char *pathname, mode_t mode);mode的取值是
S_IRWXU， 00700 user (file owner) has read, write and execute permission
S_IRUSR 00400 user has read permission
S_IWUSR 00200 user has write permission
S_IXUSR 00100 user has execute permission
S_IRWXG 00070 group has read, write and execute permission
S_IRGRP 00040 group has read permission
S_IWGRP 00020 group has write permission
S_IXGRP 00010 group has execute permission
S_IRWXO 00007 others have read, write and execute permission
S_IROTH 00004 others have read permission
S_IWOTH 00002 others have write permission
S_IXOTH 00001 others have execute permission