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[scan] Fix for platforms without fcopyfile() or copy_file_range()
Add @cagney's fallback copy function. Use feature tests in configure.ac for fcopyfile() and copy_file_range(). Fixes #1901
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@ -96,7 +96,13 @@ AC_SEARCH_LIBS([pthread_getthreadid_np], [pthread],
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[Define to 1 if you have pthread_getthreadid_np])])
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AC_SEARCH_LIBS([uuid_generate_random], [uuid],
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[AC_DEFINE([HAVE_UUID], 1,
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[Define to 1 if you have uuid_generate_random function])])
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[Define to 1 if you have uuid_generate_random])])
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AC_SEARCH_LIBS([copy_file_range], [c],
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[AC_DEFINE([HAVE_COPY_FILE_RANGE], 1,
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[Define to 1 if you have copy_file_range])])
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AC_SEARCH_LIBS([fcopyfile], [c],
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[AC_DEFINE([HAVE_FCOPYFILE], 1,
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[Define to 1 if you have fcopyfile])])
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AC_SEARCH_LIBS([log10], [m])
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AC_SEARCH_LIBS([lrint], [m])
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@ -31,9 +31,9 @@
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#include <sys/types.h>
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#include <sys/stat.h>
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// For file copy
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// For file copy (fcopyfile currently Mac OSX only)
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#include <fcntl.h>
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#if defined(__APPLE__)
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#if defined(HAVE_FCOPYFILE)
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#include <copyfile.h>
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#endif
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@ -810,9 +810,9 @@ static int
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fast_copy(int fd_dst, int fd_src)
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{
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// Here we use kernel-space copying for performance reasons
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#if defined(__APPLE__)
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#if defined(HAVE_FCOPYFILE)
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return fcopyfile(fd_src, fd_dst, 0, COPYFILE_ALL);
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#else
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#elif defined(HAVE_COPY_FILE_RANGE)
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struct stat fileinfo = { 0 };
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ssize_t bytes_copied;
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@ -821,6 +821,23 @@ fast_copy(int fd_dst, int fd_src)
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if (bytes_copied < 0 || bytes_copied != fileinfo.st_size)
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return -1;
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return 0;
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#else
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unsigned char buf[4096];
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ssize_t nr;
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while (1)
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{
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nr = read(fd_src, buf, sizeof(buf));
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if (nr == -1)
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return -1;
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else if (nr == 0)
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return 0;
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if (write(fd_dst, buf, nr) != nr)
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return -1;
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}
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return 0;
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#endif
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}
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