ftruncate

Before there was a need to empty open files and then re-write the requirements, but using ftruncate (FD, 0), and did not achieve the effect, but the file head has ' "", the length is larger than expected. The reason is that I did not use Lseek to

truncate ftruncate functionBoth truncate () and ftruncate () can be used to modify the file size, but there are some differences between the two.one, truncate () functionHeader file:#include function definition:int truncate (const char *path, off_t

ftruncate(change file size) define function intftruncate(int fd,off_t length); function descriptionftruncate() changes the file size specified by the parameter fd to the size specified by parameter length. The parameter fd is an open file descriptor

Reprint: http://blog.csdn.net/a_ran/article/details/43562429int truncate (const char *path, off_t length);int ftruncate (int fd, off_t length);Change the file size to the size specified by the parameter length, if the original file size is larger

Today, ftruncate is used to truncate the file, but it cannot achieve the expected results. After the file is truncated, the content is complex and the file size remains unchanged. After adding fflush () and rewind (), OK. The following is the test

C language Truncate () function: Change file sizeheader file: #include To define a function: int truncate (const char * path, off_t length); Function Description: Truncate () changes the file size specified by the

Today with ftruncateTruncation of the file, but how can not achieve the expected effect, truncated after the contents of the file is miscellaneous, and the file size is kept original. add fflush () and Rewind () after OK. Here is the test code:

C code int　ftruncate(int　fd,　off_t　length)　 int　msync(void　*addr,　size_t　len,　int　flags) First of all, the man manual inside Ftruncate said that when length is larger than the size of the file itself, will enlarge the file and make up the "", but

Linux inter-process communication (IPC) programming practices (8) use of shared memory-POSIX shared memory (API) 1. Posix provides two methods to share memory areas between unrelated processes: (1) memory ing file: open the function first, and then

**************************************************************************************************The POSIX semaphore semaphore is a primitive that is used to provide synchronization between different threads of different processes or a given