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41#include "libbb.h"
42
43int renice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
44int renice_main(int argc UNUSED_PARAM, char **argv)
45{
46 static const char Xetpriority_msg[] ALIGN1 = "%cetpriority";
47
48 int retval = EXIT_SUCCESS;
49 int which = PRIO_PROCESS;
50 int use_relative = 0;
51 int adjustment, new_priority;
52 unsigned who;
53 char *arg;
54
55
56 BUILD_BUG_ON(PRIO_PROCESS < CHAR_MIN || PRIO_PROCESS > CHAR_MAX);
57 BUILD_BUG_ON(PRIO_PGRP < CHAR_MIN || PRIO_PGRP > CHAR_MAX);
58 BUILD_BUG_ON(PRIO_USER < CHAR_MIN || PRIO_USER > CHAR_MAX);
59
60 arg = *++argv;
61
62
63 if (arg && arg[0] == '-' && arg[1] == 'n') {
64 use_relative = 1;
65 if (!arg[2])
66 arg = *++argv;
67 else
68 arg += 2;
69 }
70
71 if (!arg) {
72 bb_show_usage();
73 }
74
75
76 adjustment = xatoi_range(arg, INT_MIN/2, INT_MAX/2);
77
78 while ((arg = *++argv) != NULL) {
79
80 if (arg[0] == '-' && arg[1]) {
81 static const char opts[] ALIGN1 = {
82 'p', 'g', 'u', 0, PRIO_PROCESS, PRIO_PGRP, PRIO_USER
83 };
84 const char *p = strchr(opts, arg[1]);
85 if (p) {
86 which = p[4];
87 if (!arg[2])
88 continue;
89 arg += 2;
90 }
91 }
92
93
94 if (which == PRIO_USER) {
95 struct passwd *p;
96
97 p = getpwnam(arg);
98 if (!p) {
99 bb_error_msg("unknown user %s", arg);
100 goto HAD_ERROR;
101 }
102 who = p->pw_uid;
103 } else {
104 who = bb_strtou(arg, NULL, 10);
105 if (errno) {
106 bb_error_msg("invalid number '%s'", arg);
107 goto HAD_ERROR;
108 }
109 }
110
111
112 if (use_relative) {
113 int old_priority;
114
115 errno = 0;
116 old_priority = getpriority(which, who);
117 if (errno) {
118 bb_perror_msg(Xetpriority_msg, 'g');
119 goto HAD_ERROR;
120 }
121
122 new_priority = old_priority + adjustment;
123 } else {
124 new_priority = adjustment;
125 }
126
127 if (setpriority(which, who, new_priority) == 0) {
128 continue;
129 }
130
131 bb_perror_msg(Xetpriority_msg, 's');
132 HAD_ERROR:
133 retval = EXIT_FAILURE;
134 }
135
136
137
138
139 return retval;
140}
141