| 1 | /* |
| 2 | Copyright (C) Andrew Tridgell 1996 |
| 3 | Copyright (C) Paul Mackerras 1996 |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | Utilities used in rsync |
| 22 | |
| 23 | tridge, June 1996 |
| 24 | */ |
| 25 | #include "rsync.h" |
| 26 | |
| 27 | int num_waiting(int fd) |
| 28 | { |
| 29 | int len=0; |
| 30 | ioctl(fd,FIONREAD,&len); |
| 31 | return(len); |
| 32 | } |
| 33 | |
| 34 | |
| 35 | struct map_struct *map_file(int fd,off_t len) |
| 36 | { |
| 37 | struct map_struct *ret; |
| 38 | ret = (struct map_struct *)malloc(sizeof(*ret)); |
| 39 | if (!ret) out_of_memory("map_file"); |
| 40 | |
| 41 | ret->map = NULL; |
| 42 | ret->fd = fd; |
| 43 | ret->size = len; |
| 44 | ret->p = NULL; |
| 45 | ret->p_size = 0; |
| 46 | ret->p_offset = 0; |
| 47 | ret->p_len = 0; |
| 48 | |
| 49 | #ifdef HAVE_MMAP |
| 50 | if (len < MAX_MAP_SIZE) |
| 51 | ret->map = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0); |
| 52 | #endif |
| 53 | return ret; |
| 54 | } |
| 55 | |
| 56 | char *map_ptr(struct map_struct *map,off_t offset,int len) |
| 57 | { |
| 58 | if (map->map) |
| 59 | return map->map+offset; |
| 60 | |
| 61 | if (len == 0) |
| 62 | return NULL; |
| 63 | |
| 64 | len = MIN(len,map->size-offset); |
| 65 | |
| 66 | if (offset >= map->p_offset && |
| 67 | offset+len <= map->p_offset+map->p_len) { |
| 68 | return (map->p + (offset - map->p_offset)); |
| 69 | } |
| 70 | |
| 71 | len = MAX(len,CHUNK_SIZE); |
| 72 | len = MIN(len,map->size - offset); |
| 73 | |
| 74 | if (len > map->p_size) { |
| 75 | if (map->p) free(map->p); |
| 76 | map->p = (char *)malloc(len); |
| 77 | if (!map->p) out_of_memory("map_ptr"); |
| 78 | map->p_size = len; |
| 79 | } |
| 80 | |
| 81 | if (lseek(map->fd,offset,SEEK_SET) != offset || |
| 82 | read(map->fd,map->p,len) != len) { |
| 83 | fprintf(FERROR,"EOF in map_ptr!\n"); |
| 84 | exit_cleanup(1); |
| 85 | } |
| 86 | |
| 87 | map->p_offset = offset; |
| 88 | map->p_len = len; |
| 89 | |
| 90 | return map->p; |
| 91 | } |
| 92 | |
| 93 | |
| 94 | void unmap_file(struct map_struct *map) |
| 95 | { |
| 96 | #ifdef HAVE_MMAP |
| 97 | if (map->map) |
| 98 | munmap(map->map,map->size); |
| 99 | #endif |
| 100 | if (map->p) free(map->p); |
| 101 | free(map); |
| 102 | } |
| 103 | |
| 104 | |
| 105 | /* this is taken from CVS */ |
| 106 | int piped_child(char **command,int *f_in,int *f_out) |
| 107 | { |
| 108 | int pid; |
| 109 | int to_child_pipe[2]; |
| 110 | int from_child_pipe[2]; |
| 111 | |
| 112 | if (pipe(to_child_pipe) < 0 || |
| 113 | pipe(from_child_pipe) < 0) { |
| 114 | fprintf(FERROR,"pipe: %s\n",strerror(errno)); |
| 115 | exit_cleanup(1); |
| 116 | } |
| 117 | |
| 118 | |
| 119 | pid = fork(); |
| 120 | if (pid < 0) { |
| 121 | fprintf(FERROR,"fork: %s\n",strerror(errno)); |
| 122 | exit_cleanup(1); |
| 123 | } |
| 124 | |
| 125 | if (pid == 0) |
| 126 | { |
| 127 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
| 128 | close(to_child_pipe[1]) < 0 || |
| 129 | close(from_child_pipe[0]) < 0 || |
| 130 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { |
| 131 | fprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno)); |
| 132 | exit_cleanup(1); |
| 133 | } |
| 134 | if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); |
| 135 | if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); |
| 136 | execvp(command[0], command); |
| 137 | fprintf(FERROR,"Failed to exec %s : %s\n", |
| 138 | command[0],strerror(errno)); |
| 139 | exit_cleanup(1); |
| 140 | } |
| 141 | |
| 142 | if (close(from_child_pipe[1]) < 0 || |
| 143 | close(to_child_pipe[0]) < 0) { |
| 144 | fprintf(FERROR,"Failed to close : %s\n",strerror(errno)); |
| 145 | exit_cleanup(1); |
| 146 | } |
| 147 | |
| 148 | *f_in = from_child_pipe[0]; |
| 149 | *f_out = to_child_pipe[1]; |
| 150 | |
| 151 | return pid; |
| 152 | } |
| 153 | |
| 154 | |
| 155 | void out_of_memory(char *str) |
| 156 | { |
| 157 | fprintf(FERROR,"out of memory in %s\n",str); |
| 158 | exit_cleanup(1); |
| 159 | } |
| 160 | |
| 161 | |
| 162 | #ifndef HAVE_STRDUP |
| 163 | char *strdup(char *s) |
| 164 | { |
| 165 | int l = strlen(s) + 1; |
| 166 | char *ret = (char *)malloc(l); |
| 167 | if (ret) |
| 168 | strcpy(ret,s); |
| 169 | return ret; |
| 170 | } |
| 171 | #endif |
| 172 | |
| 173 | |
| 174 | int set_modtime(char *fname,time_t modtime) |
| 175 | { |
| 176 | #ifdef HAVE_UTIME_H |
| 177 | struct utimbuf tbuf; |
| 178 | tbuf.actime = time(NULL); |
| 179 | tbuf.modtime = modtime; |
| 180 | return utime(fname,&tbuf); |
| 181 | #elif defined(HAVE_UTIME) |
| 182 | time_t t[2]; |
| 183 | t[0] = time(NULL); |
| 184 | t[1] = modtime; |
| 185 | return utime(fname,t); |
| 186 | #else |
| 187 | struct timeval t[2]; |
| 188 | t[0].tv_sec = time(NULL); |
| 189 | t[0].tv_usec = 0; |
| 190 | t[1].tv_sec = modtime; |
| 191 | t[1].tv_usec = 0; |
| 192 | return utimes(fname,t); |
| 193 | #endif |
| 194 | } |
| 195 | |
| 196 | |
| 197 | |
| 198 | /**************************************************************************** |
| 199 | Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available, |
| 200 | else |
| 201 | if SYSV use O_NDELAY |
| 202 | if BSD use FNDELAY |
| 203 | ****************************************************************************/ |
| 204 | int set_blocking(int fd, int set) |
| 205 | { |
| 206 | int val; |
| 207 | #ifdef O_NONBLOCK |
| 208 | #define FLAG_TO_SET O_NONBLOCK |
| 209 | #else |
| 210 | #ifdef SYSV |
| 211 | #define FLAG_TO_SET O_NDELAY |
| 212 | #else /* BSD */ |
| 213 | #define FLAG_TO_SET FNDELAY |
| 214 | #endif |
| 215 | #endif |
| 216 | |
| 217 | if((val = fcntl(fd, F_GETFL, 0)) == -1) |
| 218 | return -1; |
| 219 | if(set) /* Turn blocking on - ie. clear nonblock flag */ |
| 220 | val &= ~FLAG_TO_SET; |
| 221 | else |
| 222 | val |= FLAG_TO_SET; |
| 223 | return fcntl( fd, F_SETFL, val); |
| 224 | #undef FLAG_TO_SET |
| 225 | } |