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| author | Bill Wendling <isanbard@gmail.com> | 2013-09-09 22:25:46 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2013-09-09 22:25:46 +0000 |
| commit | 97c22c3c92dfa319de85a121de96d04ed3924736 (patch) | |
| tree | f081269dfc70ca49446e76fb658cf24afa587720 /compiler-rt/lib | |
| parent | 170a5f29831d5d8e8897b3815edee19a362ae78d (diff) | |
| download | bcm5719-llvm-97c22c3c92dfa319de85a121de96d04ed3924736.tar.gz bcm5719-llvm-97c22c3c92dfa319de85a121de96d04ed3924736.zip | |
Don't allow a NULL-length file. Try to revert to the buffered version.
llvm-svn: 190359
Diffstat (limited to 'compiler-rt/lib')
| -rw-r--r-- | compiler-rt/lib/profile/GCDAProfiling.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler-rt/lib/profile/GCDAProfiling.c b/compiler-rt/lib/profile/GCDAProfiling.c index ea62e794a51..f80e062485e 100644 --- a/compiler-rt/lib/profile/GCDAProfiling.c +++ b/compiler-rt/lib/profile/GCDAProfiling.c @@ -206,6 +206,11 @@ static int map_file() { fseek(output_file, 0L, SEEK_END); file_size = ftell(output_file); + /* A size of 0 is invaild to `mmap'. Return a fail here, but don't issue an + * error message because it should "just work" for the user. */ + if (file_size == 0) + return -1; + write_buffer = mmap(0, file_size, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0); if (write_buffer == (void *)-1) { |
