[#subprocess-input-2constructor-0b]
= xref:subprocess.adoc[subprocess]::xref:subprocess/input.adoc[input]::input
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Constructors

== Synopses

Declared in `<util/subprocess.h>`

Sets up a pipe as the child's input channel.


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explicit
xref:subprocess/input/2constructor-02.adoc[input](xref:subprocess/IOTYPE.adoc[IOTYPE] typ);
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Uses an already open file descriptor as the child's input.


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explicit
xref:subprocess/input/2constructor-05.adoc[input](int fd);
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Uses the descriptor of an open FILE stream as the child's input.


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explicit
xref:subprocess/input/2constructor-09.adoc[input](FILE* fp);
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Opens a file for reading and uses it as the child's input.


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explicit
xref:subprocess/input/2constructor-0f.adoc[input](char const* filename);
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== Parameters

[cols="1,4"]
|===
| Name| Description
| *typ*
| Channel type, which must be PIPE.
| *fd*
| Readable file descriptor to feed to the child.
| *fp*
| Open FILE stream whose descriptor is used.
| *filename*
| Path of the file to open read‐only.
|===


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