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BIO_gets.3
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.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32 .\" .\" Standard preamble: .\" ======================================================================== .de Sh \" Subsection heading .br .if t .Sp .ne 5 .PP \fB\\$1\fR .PP .. .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. | will give a .\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to .\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C' .\" expand to `' in nroff, nothing in troff, for use with C<>. .tr \(*W-|\(bv\*(Tr .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' 'br\} .\" .\" If the F register is turned on, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . nr % 0 . rr F .\} .\" .\" For nroff, turn off justification. 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Usually this operation will attempt to read a line of data from the \s-1BIO\s0 of maximum length \fBlen\fR. There are exceptions to this however, for example \fIBIO_gets()\fR on a digest \s-1BIO\s0 will calculate and return the digest and other BIOs may not support \fIBIO_gets()\fR at all. .PP \&\fIBIO_write()\fR attempts to write \fBlen\fR bytes from \fBbuf\fR to \s-1BIO\s0 \fBb\fR. .PP \&\fIBIO_puts()\fR attempts to write a null terminated string \fBbuf\fR to \s-1BIO\s0 \fBb\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" All these functions return either the amount of data successfully read or written (if the return value is positive) or that no data was successfully read or written if the result is 0 or \-1. If the return value is \-2 then the operation is not implemented in the specific \s-1BIO\s0 type. .SH "NOTES" .IX Header "NOTES" A 0 or \-1 return is not necessarily an indication of an error. In particular when the source/sink is non-blocking or of a certain type it may merely be an indication that no data is currently available and that the application should retry the operation later. .PP One technique sometimes used with blocking sockets is to use a system call (such as \fIselect()\fR, \fIpoll()\fR or equivalent) to determine when data is available and then call \fIread()\fR to read the data. The equivalent with BIOs (that is call \&\fIselect()\fR on the underlying I/O structure and then call \fIBIO_read()\fR to read the data) should \fBnot\fR be used because a single call to \fIBIO_read()\fR can cause several reads (and writes in the case of \s-1SSL\s0 BIOs) on the underlying I/O structure and may block as a result. Instead \fIselect()\fR (or equivalent) should be combined with non blocking I/O so successive reads will request a retry instead of blocking. .PP See \fIBIO_should_retry\fR\|(3) for details of how to determine the cause of a retry and other I/O issues. .PP If the \fIBIO_gets()\fR function is not supported by a \s-1BIO\s0 then it possible to work around this by adding a buffering \s-1BIO\s0 \fIBIO_f_buffer\fR\|(3) to the chain. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIBIO_should_retry\fR\|(3) .PP \&\s-1TBA\s0