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Improved error message when using an empty filesystem file

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Marcus Holland-Moritz 2021-03-30 17:45:36 +02:00
parent 4072fc424f
commit 071982ba0f
1 changed files with 5 additions and 0 deletions
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5
src/dwarfs/mmap.cpp
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@ -56,6 +56,10 @@ size_t safe_size(int fd) {
} }
void* safe_mmap(int fd, size_t size) { void* safe_mmap(int fd, size_t size) {
if (size == 0) {
DWARFS_THROW(runtime_error, "empty file");
}
void* addr = ::mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); void* addr = ::mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
if (addr == MAP_FAILED) { if (addr == MAP_FAILED) {
@ -64,6 +68,7 @@ void* safe_mmap(int fd, size_t size) {
return addr; return addr;
} }
} // namespace } // namespace
boost::system::error_code mmap::lock(off_t offset, size_t size) { boost::system::error_code mmap::lock(off_t offset, size_t size) {