The method of changing file size by Linux

Function prototype:

# include int ftruncate (int fd, off_t length); / / change the file size to the specified size of length; return value 0 for successful execution and-1 for failure.

The function ftruncate changes the file size specified by parameter fd to the size specified by parameter length. The parameter fd is an open file descriptor and must be a file opened in write mode. If the original file size is larger than the parameter length, the excess will be deleted.

Test.c

# include#include#include#include#include#includeint main (int argc,char** argv) {struct stat st; bzero (& st,sizeof (st)); stat (argv [1], & st); printf ("% s% ld\ n", argv [1], st.st_size); int fd=open (argv [1], O_RDWR); ftruncate (fd,20); bzero (& st,sizeof (st)); stat (argv [1], & st) Printf ("% s% ld\ n", argv [1], st.st_size); close (fd); return 0;}

Summary

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