Cleanup: open_memstream and close_memstream compat is never used
[lttng-tools.git] / src / lib / lttng-ctl / filter / memstream.h
1 #ifndef _LTTNG_CTL_MEMSTREAM_H
2 #define _LTTNG_CTL_MEMSTREAM_H
3
4 /*
5 * src/lib/lttng-ctl/memstream.h
6 *
7 * Copyright 2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 *
9 * memstream compatibility layer.
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
17 *
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
20 */
21
22 #ifdef LTTNG_HAVE_FMEMOPEN
23 #include <stdio.h>
24
25 static inline
26 FILE *lttng_fmemopen(void *buf, size_t size, const char *mode)
27 {
28 return fmemopen(buf, size, mode);
29 }
30
31 #else /* LTTNG_HAVE_FMEMOPEN */
32
33 #include <stdlib.h>
34 #include <stdio.h>
35
36 /*
37 * Fallback for systems which don't have fmemopen. Copy buffer to a
38 * temporary file, and use that file as FILE * input.
39 */
40 static inline
41 FILE *lttng_fmemopen(void *buf, size_t size, const char *mode)
42 {
43 char tmpname[PATH_MAX];
44 size_t len;
45 FILE *fp;
46 int ret;
47
48 /*
49 * Support reading only.
50 */
51 if (strcmp(mode, "rb") != 0) {
52 return NULL;
53 }
54 strncpy(tmpname, "/tmp/lttng-tmp-XXXXXX", PATH_MAX);
55 ret = mkstemp(tmpname);
56 if (ret < 0) {
57 return NULL;
58 }
59 /*
60 * We need to write to the file.
61 */
62 fp = fdopen(ret, "w+");
63 if (!fp) {
64 goto error_unlink;
65 }
66 /* Copy the entire buffer to the file */
67 len = fwrite(buf, sizeof(char), size, fp);
68 if (len != size) {
69 goto error_close;
70 }
71 ret = fseek(fp, 0L, SEEK_SET);
72 if (ret < 0) {
73 PERROR("fseek");
74 goto error_close;
75 }
76 /* We keep the handle open, but can unlink the file on the VFS. */
77 ret = unlink(tmpname);
78 if (ret < 0) {
79 PERROR("unlink");
80 }
81 return fp;
82
83 error_close:
84 ret = fclose(fp);
85 if (ret < 0) {
86 PERROR("close");
87 }
88 error_unlink:
89 ret = unlink(tmpname);
90 if (ret < 0) {
91 PERROR("unlink");
92 }
93 return NULL;
94 }
95
96 #endif /* LTTNG_HAVE_FMEMOPEN */
97
98 #endif /* _LTTNG_CTL_MEMSTREAM_H */
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