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Diffstat (limited to 'util/oslib-posix.c')
| -rw-r--r-- | util/oslib-posix.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/util/oslib-posix.c b/util/oslib-posix.c new file mode 100644 index 0000000000..4f5ec6788b --- /dev/null +++ b/util/oslib-posix.c @@ -0,0 +1,228 @@ +/* + * 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 2 MiB alignment so transparent hugepages can be used by KVM. + Valgrind does not support alignments larger than 1 MiB, + therefore we need special code which handles running on Valgrind. */ +# define QEMU_VMALLOC_ALIGN (512 * 4096) +# define CONFIG_VALGRIND +#elif defined(__linux__) && defined(__s390x__) + /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */ +# define QEMU_VMALLOC_ALIGN (256 * 4096) +#else +# define QEMU_VMALLOC_ALIGN getpagesize() +#endif + +#include "config-host.h" +#include "sysemu/sysemu.h" +#include "trace.h" +#include "qemu/sockets.h" + +#if defined(CONFIG_VALGRIND) +static int running_on_valgrind = -1; +#else +# define running_on_valgrind 0 +#endif +#ifdef CONFIG_LINUX +#include <sys/syscall.h> +#endif + +int qemu_get_thread_id(void) +{ +#if defined(__linux__) + return syscall(SYS_gettid); +#else + return getpid(); +#endif +} + +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; +} + +/* conflicts with qemu_vmalloc in bsd-user/mmap.c */ +#if !defined(CONFIG_BSD_USER) +/* alloc shared memory pages */ +void *qemu_vmalloc(size_t size) +{ + void *ptr; + size_t align = QEMU_VMALLOC_ALIGN; + +#if defined(CONFIG_VALGRIND) + if (running_on_valgrind < 0) { + /* First call, test whether we are running on Valgrind. + This is a substitute for RUNNING_ON_VALGRIND from valgrind.h. */ + const char *ld = getenv("LD_PRELOAD"); + running_on_valgrind = (ld != NULL && strstr(ld, "vgpreload")); + } +#endif + + if (size < align || running_on_valgrind) { + align = getpagesize(); + } + ptr = qemu_memalign(align, size); + trace_qemu_vmalloc(size, ptr); + return ptr; +} +#endif + +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_utimens(const char *path, const struct timespec *times) +{ + struct timeval tv[2], tv_now; + struct stat st; + int i; +#ifdef CONFIG_UTIMENSAT + int ret; + + ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW); + 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]); +} |