man/man3c/tell.3c

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 tell 3C "28 Jan 1998" "SunOS 5.11" "Standard C Library Functions"
 NAME
tell - return a file offset for a file descriptor
 SYNOPSIS

#include <unistd.h>

off_t tell(int fd);


 DESCRIPTION

The tell() function obtains the current value of the file-position
indicator for the file descriptor fd.
 RETURN VALUES

Upon successful completion, tell() returns the current value of the
file-position indicator for fd measured in bytes from the beginning of
the file.

Otherwise, it returns -1 and sets errno to indicate the error.
 ERRORS

The tell() function will fail if:

EBADF

The file descriptor fd is not an open file descriptor.


EOVERFLOW

The current file offset cannot be represented correctly in an object of type
off_t.


ESPIPE

The file descriptor fd is associated with a pipe or FIFO.


 USAGE

The tell() function is equivalent to lseek(fd, 0,
SEEK_CUR).
 ATTRIBUTES

See attributes(5) for descriptions of the following attributes:


ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe


 SEE ALSO

lseek(2), attributes(5)