| 864 | } |
| 865 | |
| 866 | static int |
| 867 | memory_map (char *path, const char *file, void **buf, size_t bytes) |
| 868 | { |
| 869 | int32_t fd; |
| 870 | void *addr; |
| 871 | int32_t res; |
| 872 | char *buffer; |
| 873 | int32_t i; |
| 874 | size_t written; |
| 875 | size_t page_size; |
| 876 | long int sysconf_page_size; |
| 877 | mode_t old_umask; |
| 878 | |
| 879 | snprintf (path, PATH_MAX, "/dev/shm/%s", file); |
| 880 | |
| 881 | old_umask = umask(CPG_MEMORY_MAP_UMASK); |
| 882 | fd = mkstemp (path); |
| 883 | (void)umask(old_umask); |
| 884 | if (fd == -1) { |
| 885 | snprintf (path, PATH_MAX, LOCALSTATEDIR "/run/%s", file); |
| 886 | old_umask = umask(CPG_MEMORY_MAP_UMASK); |
| 887 | fd = mkstemp (path); |
| 888 | (void)umask(old_umask); |
| 889 | if (fd == -1) { |
| 890 | return (-1); |
| 891 | } |
| 892 | } |
| 893 | |
| 894 | res = ftruncate (fd, bytes); |
| 895 | if (res == -1) { |
| 896 | goto error_close_unlink; |
| 897 | } |
| 898 | sysconf_page_size = sysconf(_SC_PAGESIZE); |
| 899 | if (sysconf_page_size <= 0) { |
| 900 | goto error_close_unlink; |
| 901 | } |
| 902 | page_size = sysconf_page_size; |
| 903 | buffer = malloc (page_size); |
| 904 | if (buffer == NULL) { |
| 905 | goto error_close_unlink; |
| 906 | } |
| 907 | memset (buffer, 0, page_size); |
| 908 | for (i = 0; i < (bytes / page_size); i++) { |
| 909 | retry_write: |
| 910 | written = write (fd, buffer, page_size); |
| 911 | if (written == -1 && errno == EINTR) { |
| 912 | goto retry_write; |
| 913 | } |
| 914 | if (written != page_size) { |
| 915 | free (buffer); |
| 916 | goto error_close_unlink; |
| 917 | } |
| 918 | } |
| 919 | free (buffer); |
| 920 | |
| 921 | addr = mmap (NULL, bytes, PROT_READ | PROT_WRITE, |
| 922 | MAP_SHARED, fd, 0); |
| 923 | |