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Commit | Line | Data |
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0ecb606c JJ |
1 | /* Tests for POSIX timer implementation using another process's CPU clock. */ |
2 | ||
3 | #include <unistd.h> | |
4 | ||
5 | #if _POSIX_THREADS && defined _POSIX_CPUTIME | |
6 | ||
7 | #include <errno.h> | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | #include <string.h> | |
11 | #include <fcntl.h> | |
12 | #include <time.h> | |
13 | #include <signal.h> | |
14 | #include <sys/wait.h> | |
15 | ||
16 | static clockid_t child_clock; | |
17 | ||
18 | #define TEST_CLOCK child_clock | |
19 | #define TEST_CLOCK_MISSING(clock) \ | |
20 | (setup_test () ? "other-process CPU clock timer support" : NULL) | |
21 | ||
22 | /* This function is intended to rack up both user and system time. */ | |
23 | static void | |
24 | chew_cpu (void) | |
25 | { | |
26 | while (1) | |
27 | { | |
28 | static volatile char buf[4096]; | |
29 | for (int i = 0; i < 100; ++i) | |
30 | for (size_t j = 0; j < sizeof buf; ++j) | |
31 | buf[j] = 0xaa; | |
32 | int nullfd = open ("/dev/null", O_WRONLY); | |
33 | for (int i = 0; i < 100; ++i) | |
34 | for (size_t j = 0; j < sizeof buf; ++j) | |
35 | buf[j] = 0xbb; | |
36 | write (nullfd, (char *) buf, sizeof buf); | |
37 | close (nullfd); | |
38 | if (getppid () == 1) | |
39 | _exit (2); | |
40 | } | |
41 | } | |
42 | ||
43 | static pid_t child; | |
44 | static void | |
45 | cleanup_child (void) | |
46 | { | |
47 | if (child <= 0) | |
48 | return; | |
49 | if (kill (child, SIGKILL) < 0 && errno != ESRCH) | |
50 | printf ("cannot kill child %d: %m\n", child); | |
51 | else | |
52 | { | |
53 | int status; | |
54 | errno = 0; | |
55 | if (waitpid (child, &status, 0) != child) | |
56 | printf ("waitpid %d: %m\n", child); | |
57 | } | |
58 | } | |
59 | #define CLEANUP_HANDLER cleanup_child () | |
60 | ||
61 | static int | |
62 | setup_test (void) | |
63 | { | |
64 | /* Test timers on a process CPU clock by having a child process eating | |
65 | CPU. First make sure we can make such timers at all. */ | |
66 | ||
67 | int pipefd[2]; | |
68 | if (pipe (pipefd) < 0) | |
69 | { | |
70 | printf ("pipe: %m\n"); | |
71 | exit (1); | |
72 | } | |
73 | ||
74 | child = fork (); | |
75 | ||
76 | if (child == 0) | |
77 | { | |
78 | char c; | |
79 | close (pipefd[1]); | |
80 | if (read (pipefd[0], &c, 1) == 1) | |
81 | chew_cpu (); | |
82 | _exit (1); | |
83 | } | |
84 | ||
85 | if (child < 0) | |
86 | { | |
87 | printf ("fork: %m\n"); | |
88 | exit (1); | |
89 | } | |
90 | ||
91 | atexit (&cleanup_child); | |
92 | ||
93 | close (pipefd[0]); | |
94 | ||
95 | int e = clock_getcpuclockid (child, &child_clock); | |
96 | if (e == EPERM) | |
97 | { | |
98 | puts ("clock_getcpuclockid does not support other processes"); | |
99 | return 1; | |
100 | } | |
101 | if (e != 0) | |
102 | { | |
103 | printf ("clock_getcpuclockid: %s\n", strerror (e)); | |
104 | exit (1); | |
105 | } | |
106 | ||
107 | timer_t t; | |
108 | if (timer_create (TEST_CLOCK, NULL, &t) != 0) | |
109 | { | |
110 | printf ("timer_create: %m\n"); | |
111 | return 1; | |
112 | } | |
113 | timer_delete (t); | |
114 | ||
115 | /* Get the child started chewing. */ | |
116 | if (write (pipefd[1], "x", 1) != 1) | |
117 | { | |
118 | printf ("write to pipe: %m\n"); | |
119 | return 1; | |
120 | } | |
121 | close (pipefd[1]); | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | #else | |
127 | # define TEST_CLOCK_MISSING(clock) "process clocks" | |
128 | #endif | |
129 | ||
130 | #include "tst-timer4.c" |