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BIO_set_fd.3
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This is a wrapper round the platforms file descriptor routines such as \fIread()\fR and \fIwrite()\fR. .PP \&\fIBIO_read()\fR and \fIBIO_write()\fR read or write the underlying descriptor. \&\fIBIO_puts()\fR is supported but \fIBIO_gets()\fR is not. .PP If the close flag is set then then \fIclose()\fR is called on the underlying file descriptor when the \s-1BIO\s0 is freed. .PP \&\fIBIO_reset()\fR attempts to change the file pointer to the start of file using lseek(fd, 0, 0). .PP \&\fIBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file using lseek(fd, ofs, 0). .PP \&\fIBIO_tell()\fR returns the current file position by calling lseek(fd, 0, 1). .PP \&\fIBIO_set_fd()\fR sets the file descriptor of \s-1BIO\s0 \fBb\fR to \fBfd\fR and the close flag to \fBc\fR. .PP \&\fIBIO_get_fd()\fR places the file descriptor in \fBc\fR if it is not \s-1NULL\s0, it also returns the file descriptor. If \fBc\fR is not \s-1NULL\s0 it should be of type (int *). .PP \&\fIBIO_new_fd()\fR returns a file descriptor \s-1BIO\s0 using \fBfd\fR and \fBclose_flag\fR. .SH "NOTES" .IX Header "NOTES" The behaviour of \fIBIO_read()\fR and \fIBIO_write()\fR depends on the behavior of the platforms \fIread()\fR and \fIwrite()\fR calls on the descriptor. If the underlying file descriptor is in a non blocking mode then the \s-1BIO\s0 will behave in the manner described in the \fIBIO_read\fR\|(3) and \fIBIO_should_retry\fR\|(3) manual pages. .PP File descriptor BIOs should not be used for socket I/O. Use socket BIOs instead. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIBIO_s_fd()\fR returns the file descriptor \s-1BIO\s0 method. .PP \&\fIBIO_reset()\fR returns zero for success and \-1 if an error occurred. \&\fIBIO_seek()\fR and \fIBIO_tell()\fR return the current file position or \-1 is an error occurred. These values reflect the underlying \fIlseek()\fR behaviour. .PP \&\fIBIO_set_fd()\fR always returns 1. .PP \&\fIBIO_get_fd()\fR returns the file descriptor or \-1 if the \s-1BIO\s0 has not been initialized. .PP \&\fIBIO_new_fd()\fR returns the newly allocated \s-1BIO\s0 or \s-1NULL\s0 is an error occurred. .SH "EXAMPLE" .IX Header "EXAMPLE" This is a file descriptor \s-1BIO\s0 version of \*(L"Hello World\*(R": .PP .Vb 4 \& BIO *out; \& out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE); \& BIO_printf(out, "Hello World\en"); \& BIO_free(out); .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIBIO_seek\fR\|(3), \fIBIO_tell\fR\|(3), \&\fIBIO_reset\fR\|(3), \fIBIO_read\fR\|(3), \&\fIBIO_write\fR\|(3), \fIBIO_puts\fR\|(3), \&\fIBIO_gets\fR\|(3), \fIBIO_printf\fR\|(3), \&\fIBIO_set_close\fR\|(3), \fIBIO_get_close\fR\|(3)