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.TH io_readwritefile 3
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.SH NAME
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io_readfile \- open a file for reading and writing
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.SH SYNTAX
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.B #include <libowfat/io.h>
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int \fBio_readwritefile\fP(int64* d,const char* s);
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.SH DESCRIPTION
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io_readwritefile sets d to the number of a new descriptor reading from
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and writing to the disk file named \fIs\fR, and returns 1. The file
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needs to exist.
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If something goes wrong, io_readwritefile sets \fIerrno\fR to indicate the error, and
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returns 0; it does not create a new descriptor, and it does not touch d.
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.SH "SEE ALSO"
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io_readfile(3), io_createfile(3), io_appendfile(3)
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