/src/curl/lib/curlx/wait.c
Line | Count | Source |
1 | | /*************************************************************************** |
2 | | * _ _ ____ _ |
3 | | * Project ___| | | | _ \| | |
4 | | * / __| | | | |_) | | |
5 | | * | (__| |_| | _ <| |___ |
6 | | * \___|\___/|_| \_\_____| |
7 | | * |
8 | | * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. |
9 | | * |
10 | | * This software is licensed as described in the file COPYING, which |
11 | | * you should have received as part of this distribution. The terms |
12 | | * are also available at https://curl.se/docs/copyright.html. |
13 | | * |
14 | | * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
15 | | * copies of the Software, and permit persons to whom the Software is |
16 | | * furnished to do so, under the terms of the COPYING file. |
17 | | * |
18 | | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
19 | | * KIND, either express or implied. |
20 | | * |
21 | | * SPDX-License-Identifier: curl |
22 | | * |
23 | | ***************************************************************************/ |
24 | | #include "../curl_setup.h" |
25 | | |
26 | | #ifndef HAVE_SELECT |
27 | | #error "We cannot compile without select() support." |
28 | | #endif |
29 | | |
30 | | #ifdef HAVE_SYS_SELECT_H |
31 | | #include <sys/select.h> |
32 | | #elif defined(HAVE_UNISTD_H) |
33 | | #include <unistd.h> |
34 | | #endif |
35 | | |
36 | | #ifdef MSDOS |
37 | | #include <dos.h> /* delay() */ |
38 | | #endif |
39 | | |
40 | | #include "timediff.h" |
41 | | #include "wait.h" |
42 | | |
43 | | /* |
44 | | * Internal function used for waiting a specific amount of ms in |
45 | | * Curl_socket_check() and Curl_poll() when no file descriptor is provided to |
46 | | * wait on, just being used to delay execution. Winsock select() and poll() |
47 | | * timeout mechanisms need a valid socket descriptor in a not null file |
48 | | * descriptor set to work. Waiting indefinitely with this function is not |
49 | | * allowed, a zero or negative timeout value will return immediately. Timeout |
50 | | * resolution, accuracy, as well as maximum supported value is system |
51 | | * dependent, neither factor is a critical issue for the intended use of this |
52 | | * function in the library. |
53 | | * |
54 | | * Return values: |
55 | | * -1 = system call error, or invalid timeout value |
56 | | * 0 = specified timeout has elapsed, or interrupted |
57 | | */ |
58 | | int curlx_wait_ms(timediff_t timeout_ms) |
59 | 0 | { |
60 | 0 | int r = 0; |
61 | |
|
62 | 0 | if(!timeout_ms) |
63 | 0 | return 0; |
64 | 0 | if(timeout_ms < 0) { |
65 | 0 | SET_SOCKERRNO(SOCKEINVAL); |
66 | 0 | return -1; |
67 | 0 | } |
68 | | #ifdef MSDOS |
69 | | delay((unsigned int)timeout_ms); |
70 | | #elif defined(_WIN32) |
71 | | /* prevent overflow, timeout_ms is typecast to ULONG/DWORD. */ |
72 | | #if TIMEDIFF_T_MAX >= ULONG_MAX |
73 | | if(timeout_ms >= ULONG_MAX) |
74 | | timeout_ms = ULONG_MAX - 1; |
75 | | /* do not use ULONG_MAX, because that is equal to INFINITE */ |
76 | | #endif |
77 | | Sleep((DWORD)timeout_ms); |
78 | | #else |
79 | | /* avoid using poll() for this since it behaves incorrectly with no sockets |
80 | | on Apple operating systems */ |
81 | 0 | { |
82 | 0 | struct timeval pending_tv; |
83 | 0 | r = select(0, NULL, NULL, NULL, curlx_mstotv(&pending_tv, timeout_ms)); |
84 | 0 | } |
85 | 0 | #endif /* _WIN32 */ |
86 | 0 | if(r) { |
87 | 0 | if((r == -1) && (SOCKERRNO == SOCKEINTR)) |
88 | | /* make EINTR from select or poll not a "lethal" error */ |
89 | 0 | r = 0; |
90 | 0 | else |
91 | 0 | r = -1; |
92 | 0 | } |
93 | 0 | return r; |
94 | 0 | } |