Commit | Line | Data |
---|---|---|
0458ed8c | 1 | /* |
9d16b343 | 2 | * Copyright (C) 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
0458ed8c | 3 | * |
9d16b343 | 4 | * SPDX-License-Identifier: LGPL-2.1-only |
0458ed8c | 5 | * |
0458ed8c JG |
6 | */ |
7 | ||
b2047add | 8 | #include <assert.h> |
389fbf04 | 9 | #include <common/compat/time.h> |
395d6b02 | 10 | #include <common/time.h> |
0458ed8c | 11 | #include <errno.h> |
b2047add FD |
12 | #include <fcntl.h> |
13 | #include <poll.h> | |
14 | #include <stdbool.h> | |
15 | #include <stdint.h> | |
16 | #include <stdio.h> | |
17 | #include <stdlib.h> | |
18 | #include <sys/stat.h> | |
19 | #include <sys/types.h> | |
20 | #include <unistd.h> | |
21 | ||
22 | #include "utils.h" | |
0458ed8c | 23 | |
0458ed8c JG |
24 | static inline |
25 | int64_t elapsed_time_ns(struct timespec *t1, struct timespec *t2) | |
26 | { | |
27 | struct timespec delta; | |
28 | ||
29 | assert(t1 && t2); | |
30 | delta.tv_sec = t2->tv_sec - t1->tv_sec; | |
31 | delta.tv_nsec = t2->tv_nsec - t1->tv_nsec; | |
32 | return ((int64_t) NSEC_PER_SEC * (int64_t) delta.tv_sec) + | |
33 | (int64_t) delta.tv_nsec; | |
34 | } | |
35 | ||
36 | int usleep_safe(useconds_t usec) | |
37 | { | |
38 | int ret = 0; | |
39 | struct timespec t1, t2; | |
40 | int64_t time_remaining_ns = (int64_t) usec * (int64_t) NSEC_PER_USEC; | |
41 | ||
389fbf04 | 42 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &t1); |
0458ed8c JG |
43 | if (ret) { |
44 | ret = -1; | |
45 | perror("clock_gettime"); | |
46 | goto end; | |
47 | } | |
48 | ||
49 | while (time_remaining_ns > 0) { | |
50 | ret = usleep(time_remaining_ns / (int64_t) NSEC_PER_USEC); | |
51 | if (ret && errno != EINTR) { | |
52 | perror("usleep"); | |
53 | goto end; | |
54 | } | |
55 | ||
838193da | 56 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &t2); |
0458ed8c JG |
57 | if (ret) { |
58 | perror("clock_gettime"); | |
59 | goto end; | |
60 | } | |
61 | ||
62 | time_remaining_ns -= elapsed_time_ns(&t1, &t2); | |
63 | } | |
64 | end: | |
65 | return ret; | |
66 | } | |
b2047add FD |
67 | |
68 | int create_file(const char *path) | |
69 | { | |
70 | int ret; | |
71 | ||
72 | if (!path) { | |
73 | return -1; | |
74 | } | |
75 | ||
76 | ret = creat(path, S_IRWXU); | |
77 | if (ret < 0) { | |
78 | perror("creat"); | |
79 | return -1; | |
80 | } | |
81 | ||
82 | ret = close(ret); | |
83 | if (ret < 0) { | |
84 | perror("close"); | |
85 | return -1; | |
86 | } | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | int wait_on_file(const char *path) | |
92 | { | |
93 | int ret; | |
94 | struct stat buf; | |
95 | ||
96 | if (!path) { | |
97 | return -1; | |
98 | } | |
99 | ||
100 | for (;;) { | |
101 | ret = stat(path, &buf); | |
102 | if (ret == -1 && errno == ENOENT) { | |
103 | ret = poll(NULL, 0, 10); /* 10 ms delay */ | |
104 | /* Should return 0 everytime */ | |
105 | if (ret) { | |
106 | if (ret < 0) { | |
107 | perror("perror"); | |
108 | } else { | |
109 | fprintf(stderr, | |
110 | "poll return value is larger than zero\n"); | |
111 | } | |
112 | return -1; | |
113 | } | |
114 | continue; /* retry */ | |
115 | } | |
116 | if (ret) { | |
117 | perror("stat"); | |
118 | return -1; | |
119 | } | |
120 | break; /* found */ | |
121 | } | |
122 | ||
123 | return 0; | |
124 | } |