b999d48941
We're losing the svn history (which we could probably keep if we tried hard enough) but don't consider that worthwhile. Note these tests are destructive, so run them only in a throwaway environment like a chroot, container, or vm. The tests/run.all script should be the one which launches all the tests. Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
47 lines
995 B
C
47 lines
995 B
C
/*
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* gcc fopen_failure.c -o fopen_failure.so -shared -ldl
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* LD_PRELOAD=./fopen_failure.so FAILURE_PATH=/etc/shadow ./test /etc/shadow
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*/
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <errno.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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typedef FILE * (*fopen_type) (const char *path, const char *mode);
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static fopen_type next_fopen;
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static const char *failure_path = NULL;
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FILE *fopen64 (const char *path, const char *mode)
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{
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printf ("fopen64(%s, %s)\n", path, mode);
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if (NULL == next_fopen)
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{
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next_fopen = dlsym (RTLD_NEXT, "fopen64");
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assert (NULL != next_fopen);
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}
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if (NULL == failure_path) {
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failure_path = getenv ("FAILURE_PATH");
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if (NULL == failure_path) {
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fputs ("No FAILURE_PATH defined\n", stderr);
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}
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}
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if ( (NULL != path)
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&& (NULL != failure_path)
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&& (strcmp (path, failure_path) == 0))
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{
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fprintf (stderr, "fopen64 FAILURE %s %s ...\n", path, mode);
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errno = EIO;
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return NULL;
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}
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return next_fopen (path, mode);
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}
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