Fstat manual c

 · The library function fstat () does not return the size of the file, it returns 0 if successful. It informs the file size by filling in the struct passed as an argument. But as @chux (deleted post) answered, it tells you the file size in bytes, not in integers. The function fscanf () inputs the data from text, so there is no direct correlation Reviews: 1. For example, if st_mode or st_uid is changed by another process by calling chmod (2) or chown (2), stat () might return the old st_mode together with the new st_uid, or the old st_uid together with the new st_mode. The fields in the stat structure are as follows: st_dev This field describes the device on which this file resides. The fstat() function shall update any time-related fields (as described in the Base Definitions volume of POSIX.1‐, Section , File Times Update), before writing into the stat structure. RETURN VALUE top Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno set to indicate the error.

Use fstat Function to Get File Size in C Alternatively, we can use the fstat function, which takes the file descriptor as the first argument to specify the target file. The file descriptor can be acquired by open system call, but be sure to close opened files when they are not needed using the close system call. The fstat() function shall update any time-related fields as described in the Base Definitions volume of IEEE Std , Section , File Times Update, before writing into the stat structure. Return Value. Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno set to indicate the error. Errors. fstat () is identical to stat (), except that the file to be stat-ed is specified by the file descriptor fd. All of these system calls return a stat structure, which contains the following fields: The st_dev field describes the device on which this file resides. (The major (3) and minor (3) macros may be useful to decompose the device ID in.

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