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95e6d268 MD |
1 | /* |
2 | * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; version 2.1 of | |
7 | * the License. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public | |
15 | * License along with this library; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
95e6d268 MD |
19 | #define _LGPL_SOURCE |
20 | #include <limits.h> | |
21 | #include <stdio.h> | |
22 | #include <sys/types.h> | |
23 | #include <unistd.h> | |
24 | #include <ust-fd.h> | |
25 | #include <dlfcn.h> | |
26 | ||
27 | #include <helper.h> | |
28 | #include "usterr-signal-safe.h" | |
29 | ||
95e6d268 | 30 | static int (*__lttng_ust_fd_plibc_close)(int fd); |
52a20dc7 | 31 | static int (*__lttng_ust_fd_plibc_fclose)(FILE *stream); |
95e6d268 MD |
32 | |
33 | static | |
34 | int _lttng_ust_fd_libc_close(int fd) | |
35 | { | |
36 | if (!__lttng_ust_fd_plibc_close) { | |
37 | __lttng_ust_fd_plibc_close = dlsym(RTLD_NEXT, "close"); | |
38 | if (!__lttng_ust_fd_plibc_close) { | |
39 | fprintf(stderr, "%s\n", dlerror()); | |
40 | return -1; | |
41 | } | |
42 | } | |
43 | return lttng_ust_safe_close_fd(fd, __lttng_ust_fd_plibc_close); | |
44 | } | |
45 | ||
52a20dc7 MD |
46 | static |
47 | int _lttng_ust_fd_libc_fclose(FILE *stream) | |
48 | { | |
49 | if (!__lttng_ust_fd_plibc_fclose) { | |
50 | __lttng_ust_fd_plibc_fclose = dlsym(RTLD_NEXT, "fclose"); | |
51 | if (!__lttng_ust_fd_plibc_fclose) { | |
52 | fprintf(stderr, "%s\n", dlerror()); | |
53 | return -1; | |
54 | } | |
55 | } | |
56 | return lttng_ust_safe_fclose_stream(stream, | |
57 | __lttng_ust_fd_plibc_fclose); | |
58 | } | |
59 | ||
95e6d268 MD |
60 | int close(int fd) |
61 | { | |
62 | return _lttng_ust_fd_libc_close(fd); | |
63 | } | |
64 | ||
52a20dc7 MD |
65 | /* |
66 | * Note: fcloseall() is not an issue because it fcloses only the | |
67 | * streams it knows about, which differs from the problems caused by | |
68 | * gnulib close_stdout(), which does an explicit fclose(stdout). | |
69 | */ | |
70 | int fclose(FILE *stream) | |
71 | { | |
72 | return _lttng_ust_fd_libc_fclose(stream); | |
73 | } | |
74 | ||
95e6d268 MD |
75 | #if defined(__sun__) || defined(__FreeBSD__) |
76 | /* Solaris and FreeBSD. */ | |
77 | void closefrom(int lowfd) | |
78 | { | |
23366626 | 79 | (void) lttng_ust_safe_closefrom_fd(lowfd, __lttng_ust_fd_plibc_close); |
95e6d268 MD |
80 | } |
81 | #elif defined(__NetBSD__) || defined(__OpenBSD__) | |
82 | /* NetBSD and OpenBSD. */ | |
83 | int closefrom(int lowfd) | |
84 | { | |
23366626 | 85 | return lttng_ust_safe_closefrom_fd(lowfd, __lttng_ust_fd_plibc_close); |
95e6d268 MD |
86 | } |
87 | #else | |
88 | /* As far as we know, this OS does not implement closefrom. */ | |
89 | #endif |