aboutsummaryrefslogtreecommitdiff
path: root/oslib-posix.c
blob: dbc8ee896036190e5efdc10655766007431cd3ab (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/*
 * os-posix-lib.c
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 * Copyright (c) 2010 Red Hat, Inc.
 *
 * QEMU library functions on POSIX which are shared between QEMU and
 * the QEMU tools.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/* The following block of code temporarily renames the daemon() function so the
   compiler does not see the warning associated with it in stdlib.h on OSX */
#ifdef __APPLE__
#define daemon qemu_fake_daemon_function
#include <stdlib.h>
#undef daemon
extern int daemon(int, int);
#endif

#if defined(__linux__) && defined(__x86_64__)
   /* Use 2MB alignment so transparent hugepages can be used by KVM */
#  define QEMU_VMALLOC_ALIGN (512 * 4096)
#else
#  define QEMU_VMALLOC_ALIGN getpagesize()
#endif

#include "config-host.h"
#include "sysemu.h"
#include "trace.h"
#include "qemu_socket.h"



int qemu_daemon(int nochdir, int noclose)
{
    return daemon(nochdir, noclose);
}

void *qemu_oom_check(void *ptr)
{
    if (ptr == NULL) {
        fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
        abort();
    }
    return ptr;
}

void *qemu_memalign(size_t alignment, size_t size)
{
    void *ptr;
#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
    int ret;
    ret = posix_memalign(&ptr, alignment, size);
    if (ret != 0) {
        fprintf(stderr, "Failed to allocate %zu B: %s\n",
                size, strerror(ret));
        abort();
    }
#elif defined(CONFIG_BSD)
    ptr = qemu_oom_check(valloc(size));
#else
    ptr = qemu_oom_check(memalign(alignment, size));
#endif
    trace_qemu_memalign(alignment, size, ptr);
    return ptr;
}

/* alloc shared memory pages */
void *qemu_vmalloc(size_t size)
{
    void *ptr;
    size_t align = QEMU_VMALLOC_ALIGN;

    if (size < align) {
        align = getpagesize();
    }
    ptr = qemu_memalign(align, size);
    trace_qemu_vmalloc(size, ptr);
    return ptr;
}

void qemu_vfree(void *ptr)
{
    trace_qemu_vfree(ptr);
    free(ptr);
}

void socket_set_block(int fd)
{
    int f;
    f = fcntl(fd, F_GETFL);
    fcntl(fd, F_SETFL, f & ~O_NONBLOCK);
}

void socket_set_nonblock(int fd)
{
    int f;
    f = fcntl(fd, F_GETFL);
    fcntl(fd, F_SETFL, f | O_NONBLOCK);
}

void qemu_set_cloexec(int fd)
{
    int f;
    f = fcntl(fd, F_GETFD);
    fcntl(fd, F_SETFD, f | FD_CLOEXEC);
}

/*
 * Creates a pipe with FD_CLOEXEC set on both file descriptors
 */
int qemu_pipe(int pipefd[2])
{
    int ret;

#ifdef CONFIG_PIPE2
    ret = pipe2(pipefd, O_CLOEXEC);
    if (ret != -1 || errno != ENOSYS) {
        return ret;
    }
#endif
    ret = pipe(pipefd);
    if (ret == 0) {
        qemu_set_cloexec(pipefd[0]);
        qemu_set_cloexec(pipefd[1]);
    }

    return ret;
}

int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
                   int flags)
{
    struct timeval tv[2], tv_now;
    struct stat st;
    int i;
#ifdef CONFIG_UTIMENSAT
    int ret;

    ret = utimensat(dirfd, path, times, flags);
    if (ret != -1 || errno != ENOSYS) {
        return ret;
    }
#endif
    /* Fallback: use utimes() instead of utimensat() */

    /* happy if special cases */
    if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
        return 0;
    }
    if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
        return utimes(path, NULL);
    }

    /* prepare for hard cases */
    if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
        gettimeofday(&tv_now, NULL);
    }
    if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
        stat(path, &st);
    }

    for (i = 0; i < 2; i++) {
        if (times[i].tv_nsec == UTIME_NOW) {
            tv[i].tv_sec = tv_now.tv_sec;
            tv[i].tv_usec = tv_now.tv_usec;
        } else if (times[i].tv_nsec == UTIME_OMIT) {
            tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
            tv[i].tv_usec = 0;
        } else {
            tv[i].tv_sec = times[i].tv_sec;
            tv[i].tv_usec = times[i].tv_nsec / 1000;
        }
    }

    return utimes(path, &tv[0]);
}