Platform specific fixes#609
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polar_monitor extension with no functional changes for Linux. In particular: - Removed inclusion of <linux/limits.h> from procstat.h and related sources. Verified that no constants (e.g., PATH_MAX, NAME_MAX) from <linux/limits.h> are used in procstat.h, procstat.c, or polar_monitor_io.c. - Wrapped usage of <linux/sockios.h>, TCP_INFO, SOL_TCP, SIOCOUTQ, and SIOCINQ with #ifdef __linux__ in polar_network_stats.c Provided safe fallbacks: set values to 0 or skip updates.
polar_vfs. In particular: - Gate .vfs_posix_fallocate behind HAVE_POSIX_FALLOCATE across VFS managers. Wrap .vfs_posix_fallocate assignments with HAVE_POSIX_FALLOCATE and set to NULL when the platform does not provide posix_fallocate.
In particular: - an early return is added when open() fails to avoid calling fadvise()/close() on an invalid fd. - platform specific posix_fadvise() call was replaced with appropriate polar_posix_fadvise() call. The invocation is guarded with directives USE_POSIX_FADVISE and POSIX_FADV_DONTNEED. Falls back to no-op when the call is unavailable. This aligns the function's behavior with existing PolarDB practice in fd.c, xlog.c, etc. - the polar_fd.h header file was included to make the polar_posix_fadvise() function available.
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Hi,
Several minor changes are proposed that could improve portability in the future.