xref: /illumos-kvm-cmd/oslib-posix.c (revision 68396ea9)
1 /*
2  * os-posix-lib.c
3  *
4  * Copyright (c) 2003-2008 Fabrice Bellard
5  * Copyright (c) 2010 Red Hat, Inc.
6  *
7  * QEMU library functions on POSIX which are shared between QEMU and
8  * the QEMU tools.
9  *
10  * Permission is hereby granted, free of charge, to any person obtaining a copy
11  * of this software and associated documentation files (the "Software"), to deal
12  * in the Software without restriction, including without limitation the rights
13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14  * copies of the Software, and to permit persons to whom the Software is
15  * furnished to do so, subject to the following conditions:
16  *
17  * The above copyright notice and this permission notice shall be included in
18  * all copies or substantial portions of the Software.
19  *
20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26  * THE SOFTWARE.
27  */
28 
29 #include "config-host.h"
30 #include "sysemu.h"
31 #include "trace.h"
32 #include "qemu_socket.h"
33 
qemu_oom_check(void * ptr)34 void *qemu_oom_check(void *ptr)
35 {
36     if (ptr == NULL) {
37         fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
38         abort();
39     }
40     return ptr;
41 }
42 
qemu_memalign(size_t alignment,size_t size)43 void *qemu_memalign(size_t alignment, size_t size)
44 {
45     void *ptr;
46 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
47     int ret;
48     ret = posix_memalign(&ptr, alignment, size);
49     if (ret != 0) {
50         fprintf(stderr, "Failed to allocate %zu B: %s\n",
51                 size, strerror(ret));
52         abort();
53     }
54 #elif defined(CONFIG_BSD)
55     ptr = qemu_oom_check(valloc(size));
56 #else
57     ptr = qemu_oom_check(memalign(alignment, size));
58 #endif
59     trace_qemu_memalign(alignment, size, ptr);
60     return ptr;
61 }
62 
63 /* alloc shared memory pages */
qemu_vmalloc(size_t size)64 void *qemu_vmalloc(size_t size)
65 {
66 #ifndef __ia64__
67     return qemu_memalign(getpagesize(), size);
68 #else
69     return qemu_memalign(65536, size);
70 #endif
71 }
72 
qemu_vfree(void * ptr)73 void qemu_vfree(void *ptr)
74 {
75     trace_qemu_vfree(ptr);
76     free(ptr);
77 }
78 
socket_set_nonblock(int fd)79 void socket_set_nonblock(int fd)
80 {
81     int f;
82     f = fcntl(fd, F_GETFL);
83     fcntl(fd, F_SETFL, f | O_NONBLOCK);
84 }
85 
qemu_set_cloexec(int fd)86 void qemu_set_cloexec(int fd)
87 {
88     int f;
89     f = fcntl(fd, F_GETFD);
90     fcntl(fd, F_SETFD, f | FD_CLOEXEC);
91 }
92 
93 /*
94  * Creates a pipe with FD_CLOEXEC set on both file descriptors
95  */
qemu_pipe(int pipefd[2])96 int qemu_pipe(int pipefd[2])
97 {
98     int ret;
99 
100 #ifdef CONFIG_PIPE2
101     ret = pipe2(pipefd, O_CLOEXEC);
102     if (ret != -1 || errno != ENOSYS) {
103         return ret;
104     }
105 #endif
106     ret = pipe(pipefd);
107     if (ret == 0) {
108         qemu_set_cloexec(pipefd[0]);
109         qemu_set_cloexec(pipefd[1]);
110     }
111 
112     return ret;
113 }
114 
qemu_utimensat(int dirfd,const char * path,const struct timespec * times,int flags)115 int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
116                    int flags)
117 {
118     struct timeval tv[2], tv_now;
119     struct stat st;
120     int i;
121 #ifdef CONFIG_UTIMENSAT
122     int ret;
123 
124     ret = utimensat(dirfd, path, times, flags);
125     if (ret != -1 || errno != ENOSYS) {
126         return ret;
127     }
128 #endif
129     /* Fallback: use utimes() instead of utimensat() */
130 
131     /* happy if special cases */
132     if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
133         return 0;
134     }
135     if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
136         return utimes(path, NULL);
137     }
138 
139     /* prepare for hard cases */
140     if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
141         gettimeofday(&tv_now, NULL);
142     }
143     if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
144         stat(path, &st);
145     }
146 
147     for (i = 0; i < 2; i++) {
148         if (times[i].tv_nsec == UTIME_NOW) {
149             tv[i].tv_sec = tv_now.tv_sec;
150             tv[i].tv_usec = tv_now.tv_usec;
151         } else if (times[i].tv_nsec == UTIME_OMIT) {
152             tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
153             tv[i].tv_usec = 0;
154         } else {
155             tv[i].tv_sec = times[i].tv_sec;
156             tv[i].tv_usec = times[i].tv_nsec / 1000;
157         }
158     }
159 
160     return utimes(path, &tv[0]);
161 }
162