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86b645e7 JS |
1 | /* |
2 | * os-posix.c | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * Copyright (c) 2010 Red Hat, Inc. | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
25 | ||
26 | #include <unistd.h> | |
27 | #include <fcntl.h> | |
28 | #include <signal.h> | |
8d963e6a JS |
29 | #include <sys/types.h> |
30 | #include <sys/wait.h> | |
6170540b | 31 | #include <libgen.h> |
86b645e7 JS |
32 | |
33 | /* Needed early for CONFIG_BSD etc. */ | |
34 | #include "config-host.h" | |
35 | #include "sysemu.h" | |
36 | ||
fe98ac14 | 37 | void os_setup_early_signal_handling(void) |
86b645e7 JS |
38 | { |
39 | struct sigaction act; | |
40 | sigfillset(&act.sa_mask); | |
41 | act.sa_flags = 0; | |
42 | act.sa_handler = SIG_IGN; | |
43 | sigaction(SIGPIPE, &act, NULL); | |
44 | } | |
8d963e6a JS |
45 | |
46 | static void termsig_handler(int signal) | |
47 | { | |
48 | qemu_system_shutdown_request(); | |
49 | } | |
50 | ||
51 | static void sigchld_handler(int signal) | |
52 | { | |
53 | waitpid(-1, NULL, WNOHANG); | |
54 | } | |
55 | ||
56 | void os_setup_signal_handling(void) | |
57 | { | |
58 | struct sigaction act; | |
59 | ||
60 | memset(&act, 0, sizeof(act)); | |
61 | act.sa_handler = termsig_handler; | |
62 | sigaction(SIGINT, &act, NULL); | |
63 | sigaction(SIGHUP, &act, NULL); | |
64 | sigaction(SIGTERM, &act, NULL); | |
65 | ||
66 | act.sa_handler = sigchld_handler; | |
67 | act.sa_flags = SA_NOCLDSTOP; | |
68 | sigaction(SIGCHLD, &act, NULL); | |
69 | } | |
6170540b JS |
70 | |
71 | /* Find a likely location for support files using the location of the binary. | |
72 | For installed binaries this will be "$bindir/../share/qemu". When | |
73 | running from the build tree this will be "$bindir/../pc-bios". */ | |
74 | #define SHARE_SUFFIX "/share/qemu" | |
75 | #define BUILD_SUFFIX "/pc-bios" | |
76 | char *os_find_datadir(const char *argv0) | |
77 | { | |
78 | char *dir; | |
79 | char *p = NULL; | |
80 | char *res; | |
81 | char buf[PATH_MAX]; | |
82 | size_t max_len; | |
83 | ||
84 | #if defined(__linux__) | |
85 | { | |
86 | int len; | |
87 | len = readlink("/proc/self/exe", buf, sizeof(buf) - 1); | |
88 | if (len > 0) { | |
89 | buf[len] = 0; | |
90 | p = buf; | |
91 | } | |
92 | } | |
93 | #elif defined(__FreeBSD__) | |
94 | { | |
95 | static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; | |
96 | size_t len = sizeof(buf) - 1; | |
97 | ||
98 | *buf = '\0'; | |
99 | if (!sysctl(mib, sizeof(mib)/sizeof(*mib), buf, &len, NULL, 0) && | |
100 | *buf) { | |
101 | buf[sizeof(buf) - 1] = '\0'; | |
102 | p = buf; | |
103 | } | |
104 | } | |
105 | #endif | |
106 | /* If we don't have any way of figuring out the actual executable | |
107 | location then try argv[0]. */ | |
108 | if (!p) { | |
109 | p = realpath(argv0, buf); | |
110 | if (!p) { | |
111 | return NULL; | |
112 | } | |
113 | } | |
114 | dir = dirname(p); | |
115 | dir = dirname(dir); | |
116 | ||
117 | max_len = strlen(dir) + | |
118 | MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1; | |
119 | res = qemu_mallocz(max_len); | |
120 | snprintf(res, max_len, "%s%s", dir, SHARE_SUFFIX); | |
121 | if (access(res, R_OK)) { | |
122 | snprintf(res, max_len, "%s%s", dir, BUILD_SUFFIX); | |
123 | if (access(res, R_OK)) { | |
124 | qemu_free(res); | |
125 | res = NULL; | |
126 | } | |
127 | } | |
128 | ||
129 | return res; | |
130 | } | |
131 | #undef SHARE_SUFFIX | |
132 | #undef BUILD_SUFFIX |