Commit | Line | Data |
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c627d613 AT |
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 | ||
720b47f2 | 27 | int num_waiting(int fd) |
94481d91 AT |
28 | { |
29 | int len=0; | |
94481d91 | 30 | ioctl(fd,FIONREAD,&len); |
94481d91 AT |
31 | return(len); |
32 | } | |
33 | ||
d9bea2dd | 34 | |
c6e7fcb4 | 35 | struct map_struct *map_file(int fd,off_t len) |
c627d613 | 36 | { |
c6e7fcb4 AT |
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 | ||
d9bea2dd AT |
49 | #ifdef HAVE_MMAP |
50 | if (len < MAX_MAP_SIZE) | |
c6e7fcb4 | 51 | ret->map = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0); |
d9bea2dd | 52 | #endif |
c627d613 AT |
53 | return ret; |
54 | } | |
55 | ||
c6e7fcb4 | 56 | char *map_ptr(struct map_struct *map,off_t offset,int len) |
d9bea2dd | 57 | { |
0cfcfa29 AT |
58 | int nread = -2; |
59 | ||
c6e7fcb4 AT |
60 | if (map->map) |
61 | return map->map+offset; | |
d9bea2dd AT |
62 | |
63 | if (len == 0) | |
64 | return NULL; | |
65 | ||
c6e7fcb4 | 66 | len = MIN(len,map->size-offset); |
d9bea2dd | 67 | |
c6e7fcb4 AT |
68 | if (offset >= map->p_offset && |
69 | offset+len <= map->p_offset+map->p_len) { | |
70 | return (map->p + (offset - map->p_offset)); | |
d9bea2dd AT |
71 | } |
72 | ||
34ccb63e | 73 | len = MAX(len,CHUNK_SIZE); |
c6e7fcb4 | 74 | len = MIN(len,map->size - offset); |
d9bea2dd | 75 | |
c6e7fcb4 AT |
76 | if (len > map->p_size) { |
77 | if (map->p) free(map->p); | |
78 | map->p = (char *)malloc(len); | |
79 | if (!map->p) out_of_memory("map_ptr"); | |
80 | map->p_size = len; | |
d9bea2dd AT |
81 | } |
82 | ||
c6e7fcb4 | 83 | if (lseek(map->fd,offset,SEEK_SET) != offset || |
0cfcfa29 AT |
84 | (nread=read(map->fd,map->p,len)) != len) { |
85 | fprintf(FERROR,"EOF in map_ptr! (offset=%d len=%d nread=%d errno=%d)\n", | |
86 | (int)offset, len, nread, errno); | |
34ccb63e | 87 | exit_cleanup(1); |
d9bea2dd AT |
88 | } |
89 | ||
c6e7fcb4 AT |
90 | map->p_offset = offset; |
91 | map->p_len = len; | |
d9bea2dd | 92 | |
c6e7fcb4 | 93 | return map->p; |
d9bea2dd AT |
94 | } |
95 | ||
96 | ||
c6e7fcb4 | 97 | void unmap_file(struct map_struct *map) |
c627d613 | 98 | { |
7bec6a5c | 99 | #ifdef HAVE_MMAP |
c6e7fcb4 AT |
100 | if (map->map) |
101 | munmap(map->map,map->size); | |
7bec6a5c | 102 | #endif |
c6e7fcb4 AT |
103 | if (map->p) free(map->p); |
104 | free(map); | |
c627d613 AT |
105 | } |
106 | ||
107 | ||
c627d613 AT |
108 | /* this is taken from CVS */ |
109 | int piped_child(char **command,int *f_in,int *f_out) | |
110 | { | |
111 | int pid; | |
112 | int to_child_pipe[2]; | |
113 | int from_child_pipe[2]; | |
114 | ||
115 | if (pipe(to_child_pipe) < 0 || | |
116 | pipe(from_child_pipe) < 0) { | |
dc5ddbcc | 117 | fprintf(FERROR,"pipe: %s\n",strerror(errno)); |
34ccb63e | 118 | exit_cleanup(1); |
c627d613 AT |
119 | } |
120 | ||
121 | ||
122 | pid = fork(); | |
123 | if (pid < 0) { | |
dc5ddbcc | 124 | fprintf(FERROR,"fork: %s\n",strerror(errno)); |
34ccb63e | 125 | exit_cleanup(1); |
c627d613 AT |
126 | } |
127 | ||
128 | if (pid == 0) | |
129 | { | |
130 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || | |
131 | close(to_child_pipe[1]) < 0 || | |
132 | close(from_child_pipe[0]) < 0 || | |
133 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
dc5ddbcc | 134 | fprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno)); |
34ccb63e | 135 | exit_cleanup(1); |
c627d613 | 136 | } |
773f2bd4 AT |
137 | if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); |
138 | if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); | |
c627d613 | 139 | execvp(command[0], command); |
dc5ddbcc | 140 | fprintf(FERROR,"Failed to exec %s : %s\n", |
c627d613 | 141 | command[0],strerror(errno)); |
34ccb63e | 142 | exit_cleanup(1); |
c627d613 AT |
143 | } |
144 | ||
145 | if (close(from_child_pipe[1]) < 0 || | |
146 | close(to_child_pipe[0]) < 0) { | |
dc5ddbcc | 147 | fprintf(FERROR,"Failed to close : %s\n",strerror(errno)); |
34ccb63e | 148 | exit_cleanup(1); |
c627d613 AT |
149 | } |
150 | ||
151 | *f_in = from_child_pipe[0]; | |
152 | *f_out = to_child_pipe[1]; | |
153 | ||
154 | return pid; | |
155 | } | |
156 | ||
157 | ||
158 | void out_of_memory(char *str) | |
159 | { | |
dc5ddbcc | 160 | fprintf(FERROR,"out of memory in %s\n",str); |
34ccb63e | 161 | exit_cleanup(1); |
c627d613 AT |
162 | } |
163 | ||
164 | ||
165 | #ifndef HAVE_STRDUP | |
166 | char *strdup(char *s) | |
167 | { | |
168 | int l = strlen(s) + 1; | |
169 | char *ret = (char *)malloc(l); | |
170 | if (ret) | |
171 | strcpy(ret,s); | |
172 | return ret; | |
173 | } | |
174 | #endif | |
175 | ||
176 | ||
177 | int set_modtime(char *fname,time_t modtime) | |
178 | { | |
179 | #ifdef HAVE_UTIME_H | |
180 | struct utimbuf tbuf; | |
181 | tbuf.actime = time(NULL); | |
182 | tbuf.modtime = modtime; | |
183 | return utime(fname,&tbuf); | |
184 | #elif defined(HAVE_UTIME) | |
185 | time_t t[2]; | |
186 | t[0] = time(NULL); | |
187 | t[1] = modtime; | |
188 | return utime(fname,t); | |
189 | #else | |
190 | struct timeval t[2]; | |
191 | t[0].tv_sec = time(NULL); | |
192 | t[0].tv_usec = 0; | |
193 | t[1].tv_sec = modtime; | |
194 | t[1].tv_usec = 0; | |
195 | return utimes(fname,t); | |
196 | #endif | |
197 | } | |
94481d91 | 198 | |
720b47f2 AT |
199 | |
200 | ||
201 | /**************************************************************************** | |
202 | Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available, | |
203 | else | |
204 | if SYSV use O_NDELAY | |
205 | if BSD use FNDELAY | |
206 | ****************************************************************************/ | |
207 | int set_blocking(int fd, int set) | |
208 | { | |
209 | int val; | |
210 | #ifdef O_NONBLOCK | |
211 | #define FLAG_TO_SET O_NONBLOCK | |
212 | #else | |
213 | #ifdef SYSV | |
214 | #define FLAG_TO_SET O_NDELAY | |
215 | #else /* BSD */ | |
216 | #define FLAG_TO_SET FNDELAY | |
217 | #endif | |
218 | #endif | |
219 | ||
220 | if((val = fcntl(fd, F_GETFL, 0)) == -1) | |
221 | return -1; | |
222 | if(set) /* Turn blocking on - ie. clear nonblock flag */ | |
223 | val &= ~FLAG_TO_SET; | |
224 | else | |
225 | val |= FLAG_TO_SET; | |
226 | return fcntl( fd, F_SETFL, val); | |
227 | #undef FLAG_TO_SET | |
228 | } |