diff options
Diffstat (limited to 'arch/sandbox/cpu/os.c')
-rw-r--r-- | arch/sandbox/cpu/os.c | 95 |
1 files changed, 93 insertions, 2 deletions
diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c index 26f44cb597..725b505177 100644 --- a/arch/sandbox/cpu/os.c +++ b/arch/sandbox/cpu/os.c @@ -27,6 +27,10 @@ /* Operating System Interface */ +struct os_mem_hdr { + size_t length; /* number of bytes in the block */ +}; + ssize_t os_read(int fd, void *buf, size_t count) { return read(fd, buf, count); @@ -128,8 +132,45 @@ void os_tty_raw(int fd) void *os_malloc(size_t length) { - return mmap(NULL, length, PROT_READ | PROT_WRITE, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + struct os_mem_hdr *hdr; + + hdr = mmap(NULL, length + sizeof(*hdr), PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + if (hdr == MAP_FAILED) + return NULL; + hdr->length = length; + + return hdr + 1; +} + +void *os_free(void *ptr) +{ + struct os_mem_hdr *hdr = ptr; + + hdr--; + if (ptr) + munmap(hdr, hdr->length + sizeof(*hdr)); +} + +void *os_realloc(void *ptr, size_t length) +{ + struct os_mem_hdr *hdr = ptr; + void *buf = NULL; + + hdr--; + if (length != 0) { + buf = os_malloc(length); + if (!buf) + return buf; + if (ptr) { + if (length > hdr->length) + length = hdr->length; + memcpy(buf, ptr, length); + } + } + os_free(ptr); + + return buf; } void os_usleep(unsigned long usec) @@ -347,3 +388,53 @@ ssize_t os_get_filesize(const char *fname) return ret; return buf.st_size; } + +void os_putc(int ch) +{ + putchar(ch); +} + +void os_puts(const char *str) +{ + while (*str) + os_putc(*str++); +} + +int os_write_ram_buf(const char *fname) +{ + struct sandbox_state *state = state_get_current(); + int fd, ret; + + fd = open(fname, O_CREAT | O_WRONLY, 0777); + if (fd < 0) + return -ENOENT; + ret = write(fd, state->ram_buf, state->ram_size); + close(fd); + if (ret != state->ram_size) + return -EIO; + + return 0; +} + +int os_read_ram_buf(const char *fname) +{ + struct sandbox_state *state = state_get_current(); + int fd, ret; + int size; + + size = os_get_filesize(fname); + if (size < 0) + return -ENOENT; + if (size != state->ram_size) + return -ENOSPC; + fd = open(fname, O_RDONLY); + if (fd < 0) + return -ENOENT; + + ret = read(fd, state->ram_buf, state->ram_size); + close(fd); + if (ret != state->ram_size) + return -EIO; + + return 0; +} |