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OpenCloudOS-Kernel
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perf buildid-cache: Fix symbolic link handling 

This was broken since link(2) doesn't dereference symbolic
links. Instead 'filename' becomes a symbolic link to the same file
that 'name' refers to.

This had the bad effect to create dangling symlinks in the case that
even can't be removed with perf-buildid-cache(1).

LKML-Reference: <m38vzxxrql.fsf@gmail.com>
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Franck Bui-Huu 2010-12-10 22:06:26 +01:00 committed by Arnaldo Carvalho de Melo
parent c3a34e06db
commit 68a7a771ad
1 changed files with 6 additions and 4 deletions
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10
tools/perf/util/header.c
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@ -265,15 +265,16 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
const char *name, bool is_kallsyms)
{
const size_t size = PATH_MAX;
char *filename = malloc(size),
char *realname = realpath(name, NULL),
*filename = malloc(size),
*linkname = malloc(size), *targetname;
int len, err = -1;
if (filename == NULL || linkname == NULL)
if (realname == NULL || filename == NULL || linkname == NULL)
goto out_free;
len = snprintf(filename, size, "%s%s%s",
debugdir, is_kallsyms ? "/" : "", name);
debugdir, is_kallsyms ? "/" : "", realname);
if (mkdir_p(filename, 0755))
goto out_free;
@ -283,7 +284,7 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
if (is_kallsyms) {
if (copyfile("/proc/kallsyms", filename))
goto out_free;
} else if (link(name, filename) && copyfile(name, filename))
} else if (link(realname, filename) && copyfile(name, filename))
goto out_free;
}
@ -300,6 +301,7 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
if (symlink(targetname, linkname) == 0)
err = 0;
out_free:
free(realname);
free(filename);
free(linkname);
return err;