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#include <unistd.h>
The tell() function obtains the current value of the file-position indicator for the file descriptor fd.
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.
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.
The tell() function is equivalent to lseek(fd, 0, SEEK_CUR).
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
MT-Level | MT-Safe |
lseek(2), attributes(5)