Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
os
linux
1/*
2 * usage.c
3 *
4 * Various reporting routines.
5 * Originally copied from GIT source.
6 *
7 * Copyright (C) Linus Torvalds, 2005
8 */
9#include "util.h"
10#include "debug.h"
11
12static void report(const char *prefix, const char *err, va_list params)
13{
14 char msg[1024];
15 vsnprintf(msg, sizeof(msg), err, params);
16 fprintf(stderr, " %s%s\n", prefix, msg);
17}
18
19static NORETURN void usage_builtin(const char *err)
20{
21 fprintf(stderr, "\n Usage: %s\n", err);
22 exit(129);
23}
24
25static NORETURN void die_builtin(const char *err, va_list params)
26{
27 report(" Fatal: ", err, params);
28 exit(128);
29}
30
31static void error_builtin(const char *err, va_list params)
32{
33 report(" Error: ", err, params);
34}
35
36static void warn_builtin(const char *warn, va_list params)
37{
38 report(" Warning: ", warn, params);
39}
40
41/* If we are in a dlopen()ed .so write to a global variable would segfault
42 * (ugh), so keep things static. */
43static void (*usage_routine)(const char *err) NORETURN = usage_builtin;
44static void (*die_routine)(const char *err, va_list params) NORETURN = die_builtin;
45static void (*error_routine)(const char *err, va_list params) = error_builtin;
46static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
47
48void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN)
49{
50 die_routine = routine;
51}
52
53void usage(const char *err)
54{
55 usage_routine(err);
56}
57
58void die(const char *err, ...)
59{
60 va_list params;
61
62 va_start(params, err);
63 die_routine(err, params);
64 va_end(params);
65}
66
67int error(const char *err, ...)
68{
69 va_list params;
70
71 va_start(params, err);
72 error_routine(err, params);
73 va_end(params);
74 return -1;
75}
76
77void warning(const char *warn, ...)
78{
79 va_list params;
80
81 va_start(params, warn);
82 warn_routine(warn, params);
83 va_end(params);
84}
85
86uid_t parse_target_uid(const char *str, const char *tid, const char *pid)
87{
88 struct passwd pwd, *result;
89 char buf[1024];
90
91 if (str == NULL)
92 return UINT_MAX;
93
94 /* UID and PID are mutually exclusive */
95 if (tid || pid) {
96 ui__warning("PID/TID switch overriding UID\n");
97 sleep(1);
98 return UINT_MAX;
99 }
100
101 getpwnam_r(str, &pwd, buf, sizeof(buf), &result);
102
103 if (result == NULL) {
104 char *endptr;
105 int uid = strtol(str, &endptr, 10);
106
107 if (*endptr != '\0') {
108 ui__error("Invalid user %s\n", str);
109 return UINT_MAX - 1;
110 }
111
112 getpwuid_r(uid, &pwd, buf, sizeof(buf), &result);
113
114 if (result == NULL) {
115 ui__error("Problems obtaining information for user %s\n",
116 str);
117 return UINT_MAX - 1;
118 }
119 }
120
121 return result->pw_uid;
122}