gdb.info: read

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read

Synopsis:
     int read(int fd, void *buf, unsigned int count);
Request:
     Fread,fd,bufptr,count
Return value:
     On success, the number of bytes read is returned.
     Zero indicates end of file.  If count is zero, read
     returns zero as well.  On error, -1 is returned.
Errors:
`EBADF'
     fd is not a valid file descriptor or is not open for reading.
`EFAULT'
     buf is an invalid pointer value.
`EINTR'
     The call was interrupted by the user.