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Commit | Line | Data |
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1 | /* | |
2 | * $Source$ | |
3 | * $Author$ | |
4 | * $Header$ | |
5 | * | |
6 | * | |
7 | * Utility functions used by the DCM. | |
8 | * | |
9 | * (c) Copyright 1987, 1988 by the Massachusetts Institute of Technology. | |
10 | * For copying and distribution information, please see the file | |
11 | * <mit-copyright.h>. | |
12 | */ | |
13 | ||
14 | #ifndef lint | |
15 | static char *rcsid_utils_c = "$Header$"; | |
16 | #endif lint | |
17 | ||
18 | #include <mit-copyright.h> | |
19 | #include <stdio.h> | |
20 | #include <strings.h> | |
21 | #include <errno.h> | |
22 | #include <varargs.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/time.h> | |
25 | #include <sys/file.h> | |
26 | #include <moira.h> | |
27 | #include <moira_site.h> | |
28 | #include "dcm.h" | |
29 | ||
30 | ||
31 | int dbg = 0; | |
32 | int log_flags; | |
33 | ||
34 | extern char *strsave(); | |
35 | ||
36 | void dcm_com_err_hook(whoami, code, fmt, pvar) | |
37 | char *whoami; | |
38 | int code; | |
39 | char *fmt; | |
40 | caddr_t pvar; | |
41 | { | |
42 | if (whoami) { | |
43 | fputs(whoami, stderr); | |
44 | fputs(": ", stderr); | |
45 | } | |
46 | if (code) { | |
47 | fputs(error_message(code), stderr); | |
48 | } | |
49 | if (fmt) { | |
50 | _doprnt(fmt, pvar, stderr); | |
51 | } | |
52 | putc('\n', stderr); | |
53 | fflush(stderr); | |
54 | } | |
55 | ||
56 | void leave(s) | |
57 | char *s; | |
58 | { | |
59 | extern int errno; | |
60 | ||
61 | if (*s) | |
62 | com_err(whoami, errno, "%s: exiting", s); | |
63 | else | |
64 | com_err(whoami, errno, "exiting"); | |
65 | ||
66 | exit(errno); | |
67 | } | |
68 | ||
69 | void scream(argc, argv, hint) | |
70 | int argc; | |
71 | char **argv; | |
72 | int hint; | |
73 | { | |
74 | leave("Programmer botch"); | |
75 | } | |
76 | ||
77 | ||
78 | char *itoa(i) | |
79 | int i; | |
80 | { | |
81 | char buf[20]; | |
82 | ||
83 | sprintf(buf, "%d", i); | |
84 | return(strsave(buf)); | |
85 | } | |
86 | ||
87 | ||
88 | char *tkt_string() | |
89 | { | |
90 | return("/tmp/tkt_dcm"); | |
91 | } | |
92 | ||
93 | ||
94 | int maybe_lock_update(host, service, exclusive) | |
95 | char *host, *service; | |
96 | int exclusive; | |
97 | { | |
98 | char lock[BUFSIZ]; | |
99 | int fd; | |
100 | ||
101 | sprintf(lock, "%s/%s.%s", LOCK_DIR, host, service); | |
102 | if ((fd = open(lock, O_TRUNC | O_CREAT, 0)) < 0) | |
103 | com_err(whoami, errno, ": maybe_lock_update: opening %s", lock); | |
104 | else if (flock(fd, (exclusive ? LOCK_EX : LOCK_SH) | LOCK_NB) != 0) { | |
105 | if (errno != EWOULDBLOCK) | |
106 | com_err(whoami, errno, ": maybe_lock_update: flock"); | |
107 | else if (dbg & DBG_VERBOSE) | |
108 | com_err(whoami, 0, "%s already locked\n", lock); | |
109 | close(fd); | |
110 | return -1; | |
111 | } else if (dbg & DBG_VERBOSE) | |
112 | com_err(whoami, 0, "%s now locked\n", lock); | |
113 | return fd; | |
114 | } | |
115 | ||
116 | ||
117 | int mr_query_with_retry(name, argc, argv, proc, hint) | |
118 | char *name; | |
119 | int argc; | |
120 | char **argv; | |
121 | int (*proc)(); | |
122 | char *hint; | |
123 | { | |
124 | int status, tries; | |
125 | ||
126 | for (tries = 0; tries < DEADLOCK_TRIES; tries++) { | |
127 | status = mr_query(name, argc, argv, proc, hint); | |
128 | if (status != MR_DEADLOCK) | |
129 | return(status); | |
130 | sleep(DEADLOCK_WAIT); | |
131 | } | |
132 | return(status); | |
133 | } |