Commit | Line | Data |
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da6efb07 TL |
1 | #include "uucp.h" |
2 | #include <sys/types.h> | |
3 | #include <sys/stat.h> | |
4 | ||
5 | ||
6 | /******* | |
7 | * ulockf(file, atime) | |
8 | * char *file; | |
9 | * time_t atime; | |
10 | * | |
11 | * ulockf - this routine will create a lock file (file). | |
12 | * If one already exists, the create time is checked for | |
13 | * older than the age time (atime). | |
14 | * If it is older, an attempt will be made to unlink it | |
15 | * and create a new one. | |
16 | * | |
17 | * return codes: 0 | FAIL | |
18 | */ | |
19 | ||
20 | ulockf(file, atime) | |
21 | char *file; | |
22 | time_t atime; | |
23 | { | |
24 | struct stat stbuf; | |
25 | time_t ptime; | |
26 | int ret; | |
27 | static int pid = -1; | |
28 | static char tempfile[NAMESIZE]; | |
29 | ||
30 | if (pid < 0) { | |
31 | pid = getpid(); | |
32 | sprintf(tempfile, "LTMP.%d", pid); | |
33 | } | |
34 | if (onelock(pid, tempfile, file) == -1) { | |
35 | /* lock file exists */ | |
36 | /* get status to check age of the lock file */ | |
37 | ret = stat(file, &stbuf); | |
38 | ASSERT(ret != -1, "LOCK PROBLEM - %s", file); | |
39 | ||
40 | time(&ptime); | |
41 | if ((ptime - stbuf.st_ctime) < atime) { | |
42 | /* file not old enough to delete */ | |
43 | return(FAIL); | |
44 | } | |
45 | ||
46 | ret = unlink(file); | |
47 | ASSERT(ret != -1, "LOCK PROBLEM - %s", file); | |
48 | ||
49 | ret = onelock(pid, tempfile, file); | |
50 | ASSERT(ret == 0, "LOCK PROBLEM - %s", file); | |
51 | } | |
52 | stlock(file); | |
53 | return(0); | |
54 | } | |
55 | ||
56 | ||
57 | #define MAXLOCKS 10 /* maximum number of lock files */ | |
58 | char *Lockfile[MAXLOCKS]; | |
59 | int Nlocks = 0; | |
60 | ||
61 | /*** | |
62 | * stlock(name) put name in list of lock files | |
63 | * char *name; | |
64 | * | |
65 | * return codes: none | |
66 | */ | |
67 | ||
68 | stlock(name) | |
69 | char *name; | |
70 | { | |
71 | char *p; | |
72 | extern char *calloc(); | |
73 | int i; | |
74 | ||
75 | for (i = 0; i < Nlocks; i++) { | |
76 | if (Lockfile[i] == NULL) | |
77 | break; | |
78 | } | |
79 | ASSERT(i < MAXLOCKS, "TOO MANY LOCKS %d", i); | |
80 | if (i >= Nlocks) | |
81 | i = Nlocks++; | |
82 | p = calloc(strlen(name) + 1, sizeof (char)); | |
83 | ASSERT(p != NULL, "CAN NOT ALLOCATE FOR %s", name); | |
84 | strcpy(p, name); | |
85 | Lockfile[i] = p; | |
86 | return; | |
87 | } | |
88 | ||
89 | ||
90 | /*** | |
91 | * rmlock(name) remove all lock files in list | |
92 | * char *name; or name | |
93 | * | |
94 | * return codes: none | |
95 | */ | |
96 | ||
97 | rmlock(name) | |
98 | char *name; | |
99 | { | |
100 | int i; | |
101 | ||
102 | for (i = 0; i < Nlocks; i++) { | |
103 | if (Lockfile[i] == NULL) | |
104 | continue; | |
105 | if (name == NULL | |
106 | || strcmp(name, Lockfile[i]) == SAME) { | |
107 | unlink(Lockfile[i]); | |
108 | free(Lockfile[i]); | |
109 | Lockfile[i] = NULL; | |
110 | } | |
111 | } | |
112 | return; | |
113 | } | |
114 | ||
115 | ||
116 | /* this stuff from pjw */ | |
117 | /* /usr/pjw/bin/recover - check pids to remove unnecessary locks */ | |
118 | /* isalock(name) returns 0 if the name is a lock */ | |
119 | /* unlock(name) unlocks name if it is a lock*/ | |
120 | /* onelock(pid,tempfile,name) makes lock a name | |
121 | on behalf of pid. Tempfile must be in the same | |
122 | file system as name. */ | |
123 | /* lock(pid,tempfile,names) either locks all the | |
124 | names or none of them */ | |
125 | isalock(name) char *name; | |
126 | { | |
127 | struct stat xstat; | |
128 | if(stat(name,&xstat)<0) return(0); | |
129 | if(xstat.st_size!=sizeof(int)) return(0); | |
130 | return(1); | |
131 | } | |
132 | unlock(name) char *name; | |
133 | { | |
134 | if(isalock(name)) return(unlink(name)); | |
135 | else return(-1); | |
136 | } | |
137 | onelock(pid,tempfile,name) char *tempfile,*name; | |
138 | { int fd; | |
139 | fd=creat(tempfile,0444); | |
140 | if(fd<0) return(-1); | |
141 | write(fd,&pid,sizeof(int)); | |
142 | close(fd); | |
143 | if(link(tempfile,name)<0) | |
144 | { unlink(tempfile); | |
145 | return(-1); | |
146 | } | |
147 | unlink(tempfile); | |
148 | return(0); | |
149 | } | |
150 | lock(pid,tempfile,names) char *tempfile,**names; | |
151 | { int i,j; | |
152 | for(i=0;names[i]!=0;i++) | |
153 | { if(onelock(pid,tempfile,names[i])==0) continue; | |
154 | for(j=0;j<i;j++) unlink(names[j]); | |
155 | return(-1); | |
156 | } | |
157 | return(0); | |
158 | } | |
159 | ||
160 | #define LOCKPRE "LCK." | |
161 | ||
162 | /*** | |
163 | * delock(s) remove a lock file | |
164 | * char *s; | |
165 | * | |
166 | * return codes: 0 | FAIL | |
167 | */ | |
168 | ||
169 | delock(s) | |
170 | char *s; | |
171 | { | |
172 | char ln[30]; | |
173 | ||
174 | sprintf(ln, "%s.%s", LOCKPRE, s); | |
175 | rmlock(ln); | |
176 | } | |
177 | ||
178 | ||
179 | /*** | |
180 | * mlock(sys) create system lock | |
181 | * char *sys; | |
182 | * | |
183 | * return codes: 0 | FAIL | |
184 | */ | |
185 | ||
186 | mlock(sys) | |
187 | char *sys; | |
188 | { | |
189 | char lname[30]; | |
190 | sprintf(lname, "%s.%s", LOCKPRE, sys); | |
191 | return(ulockf(lname, (time_t) 24*3600 ) < 0 ? FAIL : 0); | |
192 | } | |
193 | ||
194 |