diff options
Diffstat (limited to 'src/common')
| -rw-r--r-- | src/common/util.cpp | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/src/common/util.cpp b/src/common/util.cpp index ab84b3185..99da737c4 100644 --- a/src/common/util.cpp +++ b/src/common/util.cpp @@ -84,6 +84,29 @@ using namespace epee; #undef MONERO_DEFAULT_LOG_CATEGORY #define MONERO_DEFAULT_LOG_CATEGORY "util" +namespace +{ + +#ifndef _WIN32 +static int flock_exnb(int fd) +{ + struct flock fl; + int ret; + + memset(&fl, 0, sizeof(fl)); + fl.l_type = F_WRLCK; + fl.l_whence = SEEK_SET; + fl.l_start = 0; + fl.l_len = 0; + ret = fcntl(fd, F_SETLK, &fl); + if (ret < 0) + MERROR("Error locking fd " << fd << ": " << errno << " (" << strerror(errno) << ")"); + return ret; +} +#endif + +} + namespace tools { std::function<void(int)> signal_handler::m_handler; @@ -184,7 +207,7 @@ namespace tools struct stat wstats = {}; if (fstat(fdw, std::addressof(wstats)) == 0 && rstats.st_dev == wstats.st_dev && rstats.st_ino == wstats.st_ino && - flock(fdw, (LOCK_EX | LOCK_NB)) == 0 && ftruncate(fdw, 0) == 0) + flock_exnb(fdw) == 0 && ftruncate(fdw, 0) == 0) { std::FILE* file = fdopen(fdw, "w"); if (file) return {file, std::move(name)}; @@ -237,10 +260,10 @@ namespace tools MERROR("Failed to open " << filename << ": " << std::error_code(GetLastError(), std::system_category())); } #else - m_fd = open(filename.c_str(), O_RDONLY | O_CREAT | O_CLOEXEC, 0666); + m_fd = open(filename.c_str(), O_RDWR | O_CREAT | O_CLOEXEC, 0666); if (m_fd != -1) { - if (flock(m_fd, LOCK_EX | LOCK_NB) == -1) + if (flock_exnb(m_fd) == -1) { MERROR("Failed to lock " << filename << ": " << std::strerror(errno)); close(m_fd); |