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.TH mmap_readat 3
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.SH NAME
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mmap_readat \- memory map a file for reading
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.SH SYNTAX
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.B #include <libowfat/mmap.h>
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const char* \fBmmap_readat\fP(const char* \fIfilename\fR,size_t* \fIfilesize\fR,int \fIdirfd\fR);
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.SH DESCRIPTION
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mmap_readat opens \fIfilename\fR for reading, maps the whole file into
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memory, closes the file, writes the length of the file to \fIfilesize\fR
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and returns a pointer to the mapped file.
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If \fIfilename\fR is a relative path and \fIdirfd\fR is not AT_FDCWD
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(defined in fcntl.h),
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\fIfilename\fR is interpreted relative to \fIdirfd\fR, which must be an
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open directory.
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The file is unmapped by the operating system if the process terminates.
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It can also be manually unmapped by calling \fBmunmap\fR from
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<sys/mman.h>.
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If the file could not be opened or mapped, (void*)0 is returned.
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.SH "SEE ALSO"
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mmap_unmap(3)
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