diff options
Diffstat (limited to 'fontconfig/src/fccache.c')
| -rw-r--r-- | fontconfig/src/fccache.c | 77 |
1 files changed, 75 insertions, 2 deletions
diff --git a/fontconfig/src/fccache.c b/fontconfig/src/fccache.c index d1fa7783b..22828820d 100644 --- a/fontconfig/src/fccache.c +++ b/fontconfig/src/fccache.c @@ -37,6 +37,21 @@ # include <unistd.h> # include <sys/mman.h> #endif +#ifdef HAVE_SYS_VFS_H +#include <sys/vfs.h> +#endif +#ifdef HAVE_SYS_STATFS_H +#include <sys/statfs.h> +#endif +#ifdef HAVE_SYS_PARAM_H +#include <sys/param.h> +#endif +#ifdef HAVE_SYS_MOUNT_H +#include <sys/mount.h> +#endif +#ifdef HAVE_MNTENT_H +#include <mntent.h> +#endif #ifndef O_BINARY #define O_BINARY 0 @@ -144,6 +159,64 @@ FcStat (const FcChar8 *file, struct stat *statb) #endif +static FcBool +FcCacheIsMmapSafe (int fd) +{ + FcBool retval = FcTrue; + static FcBool is_initialized = FcFalse; + static FcBool is_env_available = FcFalse; + static FcBool use_mmap = FcFalse; + + if (!is_initialized) + { + const char *env; + + env = getenv ("FONTCONFIG_USE_MMAP"); + if (env) + { + if (FcNameBool ((const FcChar8 *)env, &use_mmap)) + is_env_available = FcTrue; + } + is_initialized = FcTrue; + } + if (is_env_available) + return use_mmap; +#if defined(HAVE_FSTATVFS) && (defined(HAVE_STRUCT_STATVFS_F_BASETYPE) || defined(HAVE_STRUCT_STATVFS_F_FSTYPENAME)) + struct statvfs buf; + + if (fstatvfs (fd, &buf) == 0) + { + const char *p; +#if defined(HAVE_STRUCT_STATVFS_F_BASETYPE) + p = buf.f_basetype; +#elif defined(HAVE_STRUCT_STATVFS_F_FSTYPENAME) + p = buf.f_fstypename; +#endif + + if (strcmp (p, "nfs") == 0) + retval = FcFalse; + } +#elif defined(HAVE_FSTATFS) && (defined(HAVE_STRUCT_STATFS_F_FLAGS) || defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) || defined(__linux__)) + struct statfs buf; + + if (fstatfs (fd, &buf) == 0) + { +# if defined(HAVE_STRUCT_STATFS_F_FLAGS) && defined(MNT_LOCAL) + if (!(buf.f_flags & MNT_LOCAL)) +# elif defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) + if (strcmp (buf.f_fstypename, "nfs") == 0) +# elif defined(__linux__) + if (buf.f_type == 0x6969) /* nfs */ +# else +# error "BUG: No way to figure out with fstatfs()" +# endif + retval = FcFalse; + } +#endif + + return retval; +} + static const char bin2hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', @@ -602,10 +675,10 @@ FcDirCacheMapFd (int fd, struct stat *fd_stat, struct stat *dir_stat) } /* - * Lage cache files are mmap'ed, smaller cache files are read. This + * Large cache files are mmap'ed, smaller cache files are read. This * balances the system cost of mmap against per-process memory usage. */ - if (fd_stat->st_size >= FC_CACHE_MIN_MMAP) + if (FcCacheIsMmapSafe (fd) && fd_stat->st_size >= FC_CACHE_MIN_MMAP) { #if defined(HAVE_MMAP) || defined(__CYGWIN__) cache = mmap (0, fd_stat->st_size, PROT_READ, MAP_SHARED, fd, 0); |