man/man3c/tell.3c

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 TELL 3C "Jan 28, 1998"
 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(7) for descriptions of the following attributes:


ATTRIBUTE TYPE ATTRIBUTE VALUE
MT-Level MT-Safe


 SEE ALSO

 lseek (2),  attributes (7)