Build fix: implicit declaration of function 'PERROR' on Solaris
[lttng-tools.git] / src / common / filter / memstream.h
1 /*
2 * Copyright 2012 (C) Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3 *
4 * SPDX-License-Identifier: MIT
5 *
6 */
7
8 #ifndef _LTTNG_CTL_MEMSTREAM_H
9 #define _LTTNG_CTL_MEMSTREAM_H
10
11 #ifdef LTTNG_HAVE_FMEMOPEN
12 #include <stdio.h>
13
14 static inline
15 FILE *lttng_fmemopen(void *buf, size_t size, const char *mode)
16 {
17 return fmemopen(buf, size, mode);
18 }
19
20 #else /* LTTNG_HAVE_FMEMOPEN */
21
22 #include <stdlib.h>
23 #include <stdio.h>
24 #include <common/error.h>
25
26 /*
27 * Fallback for systems which don't have fmemopen. Copy buffer to a
28 * temporary file, and use that file as FILE * input.
29 */
30 static inline
31 FILE *lttng_fmemopen(void *buf, size_t size, const char *mode)
32 {
33 char tmpname[PATH_MAX];
34 size_t len;
35 FILE *fp;
36 int ret;
37
38 /*
39 * Support reading only.
40 */
41 if (strcmp(mode, "rb") != 0) {
42 return NULL;
43 }
44 strncpy(tmpname, "/tmp/lttng-tmp-XXXXXX", PATH_MAX);
45 ret = mkstemp(tmpname);
46 if (ret < 0) {
47 return NULL;
48 }
49 /*
50 * We need to write to the file.
51 */
52 fp = fdopen(ret, "w+");
53 if (!fp) {
54 goto error_unlink;
55 }
56 /* Copy the entire buffer to the file */
57 len = fwrite(buf, sizeof(char), size, fp);
58 if (len != size) {
59 goto error_close;
60 }
61 ret = fseek(fp, 0L, SEEK_SET);
62 if (ret < 0) {
63 PERROR("fseek");
64 goto error_close;
65 }
66 /* We keep the handle open, but can unlink the file on the VFS. */
67 ret = unlink(tmpname);
68 if (ret < 0) {
69 PERROR("unlink");
70 }
71 return fp;
72
73 error_close:
74 ret = fclose(fp);
75 if (ret < 0) {
76 PERROR("close");
77 }
78 error_unlink:
79 ret = unlink(tmpname);
80 if (ret < 0) {
81 PERROR("unlink");
82 }
83 return NULL;
84 }
85
86 #endif /* LTTNG_HAVE_FMEMOPEN */
87
88 #endif /* _LTTNG_CTL_MEMSTREAM_H */
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