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 | ||
389fbf04 | 8 | #include <common/compat/time.h> |
395d6b02 | 9 | #include <common/time.h> |
b2047add FD |
10 | #include <fcntl.h> |
11 | #include <poll.h> | |
12 | #include <stdbool.h> | |
13 | #include <stdint.h> | |
14 | #include <stdio.h> | |
15 | #include <stdlib.h> | |
16 | #include <sys/stat.h> | |
17 | #include <sys/types.h> | |
18 | #include <unistd.h> | |
19 | ||
edf4b93e | 20 | #include <common/compat/errno.h> |
a0377dfe | 21 | #include <common/macros.h> |
edf4b93e | 22 | |
b2047add | 23 | #include "utils.h" |
0458ed8c | 24 | |
0458ed8c JG |
25 | static inline |
26 | int64_t elapsed_time_ns(struct timespec *t1, struct timespec *t2) | |
27 | { | |
28 | struct timespec delta; | |
29 | ||
a0377dfe | 30 | LTTNG_ASSERT(t1 && t2); |
0458ed8c JG |
31 | delta.tv_sec = t2->tv_sec - t1->tv_sec; |
32 | delta.tv_nsec = t2->tv_nsec - t1->tv_nsec; | |
33 | return ((int64_t) NSEC_PER_SEC * (int64_t) delta.tv_sec) + | |
34 | (int64_t) delta.tv_nsec; | |
35 | } | |
36 | ||
37 | int usleep_safe(useconds_t usec) | |
38 | { | |
39 | int ret = 0; | |
40 | struct timespec t1, t2; | |
41 | int64_t time_remaining_ns = (int64_t) usec * (int64_t) NSEC_PER_USEC; | |
42 | ||
389fbf04 | 43 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &t1); |
0458ed8c JG |
44 | if (ret) { |
45 | ret = -1; | |
46 | perror("clock_gettime"); | |
47 | goto end; | |
48 | } | |
49 | ||
50 | while (time_remaining_ns > 0) { | |
51 | ret = usleep(time_remaining_ns / (int64_t) NSEC_PER_USEC); | |
52 | if (ret && errno != EINTR) { | |
53 | perror("usleep"); | |
54 | goto end; | |
55 | } | |
56 | ||
838193da | 57 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &t2); |
0458ed8c JG |
58 | if (ret) { |
59 | perror("clock_gettime"); | |
60 | goto end; | |
61 | } | |
62 | ||
63 | time_remaining_ns -= elapsed_time_ns(&t1, &t2); | |
64 | } | |
65 | end: | |
66 | return ret; | |
67 | } | |
b2047add FD |
68 | |
69 | int create_file(const char *path) | |
70 | { | |
71 | int ret; | |
72 | ||
73 | if (!path) { | |
74 | return -1; | |
75 | } | |
76 | ||
77 | ret = creat(path, S_IRWXU); | |
78 | if (ret < 0) { | |
79 | perror("creat"); | |
80 | return -1; | |
81 | } | |
82 | ||
83 | ret = close(ret); | |
84 | if (ret < 0) { | |
85 | perror("close"); | |
86 | return -1; | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | int wait_on_file(const char *path) | |
93 | { | |
94 | int ret; | |
95 | struct stat buf; | |
96 | ||
97 | if (!path) { | |
98 | return -1; | |
99 | } | |
100 | ||
101 | for (;;) { | |
102 | ret = stat(path, &buf); | |
103 | if (ret == -1 && errno == ENOENT) { | |
104 | ret = poll(NULL, 0, 10); /* 10 ms delay */ | |
105 | /* Should return 0 everytime */ | |
106 | if (ret) { | |
107 | if (ret < 0) { | |
108 | perror("perror"); | |
109 | } else { | |
110 | fprintf(stderr, | |
111 | "poll return value is larger than zero\n"); | |
112 | } | |
113 | return -1; | |
114 | } | |
115 | continue; /* retry */ | |
116 | } | |
117 | if (ret) { | |
118 | perror("stat"); | |
119 | return -1; | |
120 | } | |
121 | break; /* found */ | |
122 | } | |
123 | ||
124 | return 0; | |
125 | } |