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cachedel: remove file from fs cache

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1 parent 1afccbc commit 5ae3cb45c3983372e709017fedea9d7a54774b99 @Feh committed Feb 5, 2012
Showing with 45 additions and 0 deletions.
  1. +1 −0 Makefile
  2. +44 −0 cachedel.c
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@@ -1,5 +1,6 @@
default:
gcc -Wall -o cachestats cachestats.c
+ gcc -Wall -o cachedel cachedel.c
gcc -Wall -fPIC -c -o nocache.o nocache.c
gcc -Wall -fPIC -c -o fcntl_helpers.o fcntl_helpers.c
gcc -Wall -shared -Wl,-soname,nocache.so.1 -ldl -o nocache.so nocache.o fcntl_helpers.o
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@@ -0,0 +1,44 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <error.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int exiterr(const char *s)
+{
+ perror(s);
+ exit(-1);
+}
+
+int main(int argc, char *argv[])
+{
+ int fd;
+ struct stat st;
+
+ if(argc != 2) {
+ fprintf(stderr, "usage: %s <file> "
+ "-- call fadvise(DONTNEED) on file", argv[0]);
+ exit(1);
+ }
+
+ fd = open(argv[1], O_RDONLY);
+ if(fd == -1)
+ exiterr("open");
+
+ if(fstat(fd, &st) == -1)
+ exiterr("fstat");
+ if(!S_ISREG(st.st_mode)) {
+ fprintf(stderr, "%s: S_ISREG: not a regular file", argv[1]);
+ return EXIT_FAILURE;
+ }
+ if(st.st_size == 0) {
+ fprintf(stderr, "%s: file size is 0!\n", argv[1]);
+ return EXIT_FAILURE;
+ }
+
+ if(posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED) == -1)
+ exiterr("posix_fadvise");
+
+ return EXIT_SUCCESS;
+}

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