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Top Forums Programming Copying a file and reading size I get always zero. Post 302985581 by hicksd8 on Friday 11th of November 2016 02:43:30 PM
Old 11-11-2016
Hi Don,

Yep, we're all trying to guess what's happening here and none of us have enough information to know exactly.

The OP says it's a copy operation which infers that the OP expects the source to still exist after the operation. However, 'rename' is in the code.

I was attempting to explain the OP comment that his code outputs a zero length for the destination but when he lists the file it's the correct size. Given that detail I suggested that the destination was in fact a link and not a copy, and that somehow, the process fails before the inode was populated with the allocated sectors of the file. So the destination shows length zero but the source (which the OP expects to still exist) shows the correct size.

I 'guess' that we can't 'guess' any more without more info. Really sorry that I tried only to confuse the conversation.
 

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KLDSTAT(2)                                                    BSD System Calls Manual                                                   KLDSTAT(2)

NAME
kldstat -- get status of kld file LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/param.h> #include <sys/linker.h> int kldstat(int fileid, struct kld_file_stat *stat); DESCRIPTION
The kldstat() system call writes the info for the file referred to by fileid into stat. struct kld_file_stat { int version; /* set to sizeof(linker_file_stat) */ char name[MAXPATHLEN]; int refs; int id; caddr_t address; /* load address */ size_t size; /* size in bytes */ char pathname[MAXPATHLEN]; }; version This field is set to the size of the structure mentioned above by the code calling kldstat(), and not kldstat() itself. name The name of the file referred to by fileid. refs The number of modules referenced by fileid. id The id of the file specified in fileid. address The load address of the kld file. size The size of the file. pathname The full name of the file referred to by fileid, including the path. RETURN VALUES
The kldstat() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The information for the file referred to by fileid is filled into the structure pointed to by stat unless: [ENOENT] The file was not found (probably not loaded). [EINVAL] The version specified in the version field of stat is not the proper version. You would need to rebuild world, the ker- nel, or your application, if this error occurs, given that you did properly fill in the version field. [EFAULT] There was a problem copying one, some, or all of the fields into stat in the copyout(9) function. SEE ALSO
kldfind(2), kldfirstmod(2), kldload(2), kldnext(2), kldsym(2), kldunload(2), modfind(2), modfnext(2), modnext(2), modstat(2), kld(4), kldstat(8) HISTORY
The kld interface first appeared in FreeBSD 3.0. BUGS
The pathname many not be accurate if the file system mounts have changed since the module was loaded, or if this function is called within a chrooted environment. BSD March 3, 1999 BSD
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