50 lines
950 B
C++
50 lines
950 B
C++
#include <iostream>
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#include <cstring>
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#include <cerrno>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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using namespace std;
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int main(int argc, char *argv[])
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try
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{
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if (argc < 2)
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throw string("Usage: ") + argv[0] + " <filenames>";
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for( int i = 0; i < argc; ++i )
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{
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//
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// Open the file and determint its size.
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//
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char *fileName = argv[1];
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int fd = open(fileName, O_RDONLY);
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if (fd < 0)
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throw strerror(errno);
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struct stat st;
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if (fstat(fd, &st) < 0)
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throw strerror(errno);
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off_t fileSize = st.st_size;
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//
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// Request the system to unload the file from the page cache.
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//
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if (posix_fadvise(fd, 0, fileSize, POSIX_FADV_DONTNEED))
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throw strerror(errno);
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close(fd);
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}
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return 0;
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}
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catch (string str)
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{
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cout << str << endl;
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return 1;
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}
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catch (const char *str)
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{
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cout << str << endl;
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return 1;
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}
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