diff options
Diffstat (limited to 'arch/um/os-Linux')
-rw-r--r-- | arch/um/os-Linux/Makefile | 4 | ||||
-rw-r--r-- | arch/um/os-Linux/aio.c | 467 | ||||
-rw-r--r-- | arch/um/os-Linux/start_up.c | 22 | ||||
-rw-r--r-- | arch/um/os-Linux/umid.c | 335 | ||||
-rw-r--r-- | arch/um/os-Linux/user_syms.c | 5 |
5 files changed, 588 insertions, 245 deletions
diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile index b83ac8e..11e30b13 100644 --- a/arch/um/os-Linux/Makefile +++ b/arch/um/os-Linux/Makefile @@ -4,11 +4,11 @@ # obj-y = aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \ - start_up.o time.o tt.o tty.o uaccess.o user_syms.o drivers/ \ + start_up.o time.o tt.o tty.o uaccess.o umid.o user_syms.o drivers/ \ sys-$(SUBARCH)/ USER_OBJS := aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \ - start_up.o time.o tt.o tty.o uaccess.o + start_up.o time.o tt.o tty.o uaccess.o umid.o elf_aux.o: $(ARCH_DIR)/kernel-offsets.h CFLAGS_elf_aux.o += -I$(objtree)/arch/um diff --git a/arch/um/os-Linux/aio.c b/arch/um/os-Linux/aio.c index ffa759a..f897140 100644 --- a/arch/um/os-Linux/aio.c +++ b/arch/um/os-Linux/aio.c @@ -16,12 +16,12 @@ #include "mode.h" struct aio_thread_req { - enum aio_type type; - int io_fd; - unsigned long long offset; - char *buf; - int len; - struct aio_context *aio; + enum aio_type type; + int io_fd; + unsigned long long offset; + char *buf; + int len; + struct aio_context *aio; }; static int aio_req_fd_r = -1; @@ -38,18 +38,18 @@ static int aio_req_fd_w = -1; static long io_setup(int n, aio_context_t *ctxp) { - return syscall(__NR_io_setup, n, ctxp); + return syscall(__NR_io_setup, n, ctxp); } static long io_submit(aio_context_t ctx, long nr, struct iocb **iocbpp) { - return syscall(__NR_io_submit, ctx, nr, iocbpp); + return syscall(__NR_io_submit, ctx, nr, iocbpp); } static long io_getevents(aio_context_t ctx_id, long min_nr, long nr, - struct io_event *events, struct timespec *timeout) + struct io_event *events, struct timespec *timeout) { - return syscall(__NR_io_getevents, ctx_id, min_nr, nr, events, timeout); + return syscall(__NR_io_getevents, ctx_id, min_nr, nr, events, timeout); } #endif @@ -66,243 +66,245 @@ static long io_getevents(aio_context_t ctx_id, long min_nr, long nr, */ static int do_aio(aio_context_t ctx, enum aio_type type, int fd, char *buf, - int len, unsigned long long offset, struct aio_context *aio) + int len, unsigned long long offset, struct aio_context *aio) { - struct iocb iocb, *iocbp = &iocb; - char c; - int err; - - iocb = ((struct iocb) { .aio_data = (unsigned long) aio, - .aio_reqprio = 0, - .aio_fildes = fd, - .aio_buf = (unsigned long) buf, - .aio_nbytes = len, - .aio_offset = offset, - .aio_reserved1 = 0, - .aio_reserved2 = 0, - .aio_reserved3 = 0 }); - - switch(type){ - case AIO_READ: - iocb.aio_lio_opcode = IOCB_CMD_PREAD; - err = io_submit(ctx, 1, &iocbp); - break; - case AIO_WRITE: - iocb.aio_lio_opcode = IOCB_CMD_PWRITE; - err = io_submit(ctx, 1, &iocbp); - break; - case AIO_MMAP: - iocb.aio_lio_opcode = IOCB_CMD_PREAD; - iocb.aio_buf = (unsigned long) &c; - iocb.aio_nbytes = sizeof(c); - err = io_submit(ctx, 1, &iocbp); - break; - default: - printk("Bogus op in do_aio - %d\n", type); - err = -EINVAL; - break; - } - - if(err > 0) - err = 0; + struct iocb iocb, *iocbp = &iocb; + char c; + int err; + + iocb = ((struct iocb) { .aio_data = (unsigned long) aio, + .aio_reqprio = 0, + .aio_fildes = fd, + .aio_buf = (unsigned long) buf, + .aio_nbytes = len, + .aio_offset = offset, + .aio_reserved1 = 0, + .aio_reserved2 = 0, + .aio_reserved3 = 0 }); + + switch(type){ + case AIO_READ: + iocb.aio_lio_opcode = IOCB_CMD_PREAD; + err = io_submit(ctx, 1, &iocbp); + break; + case AIO_WRITE: + iocb.aio_lio_opcode = IOCB_CMD_PWRITE; + err = io_submit(ctx, 1, &iocbp); + break; + case AIO_MMAP: + iocb.aio_lio_opcode = IOCB_CMD_PREAD; + iocb.aio_buf = (unsigned long) &c; + iocb.aio_nbytes = sizeof(c); + err = io_submit(ctx, 1, &iocbp); + break; + default: + printk("Bogus op in do_aio - %d\n", type); + err = -EINVAL; + break; + } + + if(err > 0) + err = 0; else err = -errno; - return err; + return err; } static aio_context_t ctx = 0; static int aio_thread(void *arg) { - struct aio_thread_reply reply; - struct io_event event; - int err, n, reply_fd; - - signal(SIGWINCH, SIG_IGN); - - while(1){ - n = io_getevents(ctx, 1, 1, &event, NULL); - if(n < 0){ - if(errno == EINTR) - continue; - printk("aio_thread - io_getevents failed, " - "errno = %d\n", errno); - } - else { - reply = ((struct aio_thread_reply) - { .data = (void *) (long) event.data, - .err = event.res }); + struct aio_thread_reply reply; + struct io_event event; + int err, n, reply_fd; + + signal(SIGWINCH, SIG_IGN); + + while(1){ + n = io_getevents(ctx, 1, 1, &event, NULL); + if(n < 0){ + if(errno == EINTR) + continue; + printk("aio_thread - io_getevents failed, " + "errno = %d\n", errno); + } + else { + reply = ((struct aio_thread_reply) + { .data = (void *) (long) event.data, + .err = event.res }); reply_fd = ((struct aio_context *) reply.data)->reply_fd; err = os_write_file(reply_fd, &reply, sizeof(reply)); - if(err != sizeof(reply)) + if(err != sizeof(reply)) printk("aio_thread - write failed, fd = %d, " - "err = %d\n", aio_req_fd_r, -err); - } - } - return 0; + "err = %d\n", aio_req_fd_r, -err); + } + } + return 0; } #endif static int do_not_aio(struct aio_thread_req *req) { - char c; - int err; - - switch(req->type){ - case AIO_READ: - err = os_seek_file(req->io_fd, req->offset); - if(err) - goto out; - - err = os_read_file(req->io_fd, req->buf, req->len); - break; - case AIO_WRITE: - err = os_seek_file(req->io_fd, req->offset); - if(err) - goto out; - - err = os_write_file(req->io_fd, req->buf, req->len); - break; - case AIO_MMAP: - err = os_seek_file(req->io_fd, req->offset); - if(err) - goto out; - - err = os_read_file(req->io_fd, &c, sizeof(c)); - break; - default: - printk("do_not_aio - bad request type : %d\n", req->type); - err = -EINVAL; - break; - } - - out: - return err; + char c; + int err; + + switch(req->type){ + case AIO_READ: + err = os_seek_file(req->io_fd, req->offset); + if(err) + goto out; + + err = os_read_file(req->io_fd, req->buf, req->len); + break; + case AIO_WRITE: + err = os_seek_file(req->io_fd, req->offset); + if(err) + goto out; + + err = os_write_file(req->io_fd, req->buf, req->len); + break; + case AIO_MMAP: + err = os_seek_file(req->io_fd, req->offset); + if(err) + goto out; + + err = os_read_file(req->io_fd, &c, sizeof(c)); + break; + default: + printk("do_not_aio - bad request type : %d\n", req->type); + err = -EINVAL; + break; + } + +out: + return err; } static int not_aio_thread(void *arg) { - struct aio_thread_req req; - struct aio_thread_reply reply; - int err; - - signal(SIGWINCH, SIG_IGN); - while(1){ - err = os_read_file(aio_req_fd_r, &req, sizeof(req)); - if(err != sizeof(req)){ - if(err < 0) - printk("not_aio_thread - read failed, " - "fd = %d, err = %d\n", aio_req_fd_r, - -err); - else { - printk("not_aio_thread - short read, fd = %d, " - "length = %d\n", aio_req_fd_r, err); - } - continue; - } - err = do_not_aio(&req); - reply = ((struct aio_thread_reply) { .data = req.aio, - .err = err }); - err = os_write_file(req.aio->reply_fd, &reply, sizeof(reply)); - if(err != sizeof(reply)) - printk("not_aio_thread - write failed, fd = %d, " - "err = %d\n", aio_req_fd_r, -err); - } + struct aio_thread_req req; + struct aio_thread_reply reply; + int err; + + signal(SIGWINCH, SIG_IGN); + while(1){ + err = os_read_file(aio_req_fd_r, &req, sizeof(req)); + if(err != sizeof(req)){ + if(err < 0) + printk("not_aio_thread - read failed, " + "fd = %d, err = %d\n", aio_req_fd_r, + -err); + else { + printk("not_aio_thread - short read, fd = %d, " + "length = %d\n", aio_req_fd_r, err); + } + continue; + } + err = do_not_aio(&req); + reply = ((struct aio_thread_reply) { .data = req.aio, + .err = err }); + err = os_write_file(req.aio->reply_fd, &reply, sizeof(reply)); + if(err != sizeof(reply)) + printk("not_aio_thread - write failed, fd = %d, " + "err = %d\n", aio_req_fd_r, -err); + } + + return 0; } static int aio_pid = -1; static int init_aio_24(void) { - unsigned long stack; - int fds[2], err; - - err = os_pipe(fds, 1, 1); - if(err) - goto out; - - aio_req_fd_w = fds[0]; - aio_req_fd_r = fds[1]; - err = run_helper_thread(not_aio_thread, NULL, - CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0); - if(err < 0) - goto out_close_pipe; - - aio_pid = err; - goto out; - - out_close_pipe: - os_close_file(fds[0]); - os_close_file(fds[1]); - aio_req_fd_w = -1; - aio_req_fd_r = -1; - out: + unsigned long stack; + int fds[2], err; + + err = os_pipe(fds, 1, 1); + if(err) + goto out; + + aio_req_fd_w = fds[0]; + aio_req_fd_r = fds[1]; + err = run_helper_thread(not_aio_thread, NULL, + CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0); + if(err < 0) + goto out_close_pipe; + + aio_pid = err; + goto out; + +out_close_pipe: + os_close_file(fds[0]); + os_close_file(fds[1]); + aio_req_fd_w = -1; + aio_req_fd_r = -1; +out: #ifndef HAVE_AIO_ABI printk("/usr/include/linux/aio_abi.h not present during build\n"); #endif printk("2.6 host AIO support not used - falling back to I/O " "thread\n"); - return 0; + return 0; } #ifdef HAVE_AIO_ABI #define DEFAULT_24_AIO 0 static int init_aio_26(void) { - unsigned long stack; - int err; + unsigned long stack; + int err; - if(io_setup(256, &ctx)){ + if(io_setup(256, &ctx)){ err = -errno; - printk("aio_thread failed to initialize context, err = %d\n", - errno); - return err; - } + printk("aio_thread failed to initialize context, err = %d\n", + errno); + return err; + } - err = run_helper_thread(aio_thread, NULL, - CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0); - if(err < 0) - return err; + err = run_helper_thread(aio_thread, NULL, + CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0); + if(err < 0) + return err; - aio_pid = err; + aio_pid = err; printk("Using 2.6 host AIO\n"); - return 0; + return 0; } static int submit_aio_26(enum aio_type type, int io_fd, char *buf, int len, unsigned long long offset, struct aio_context *aio) { - struct aio_thread_reply reply; - int err; - - err = do_aio(ctx, type, io_fd, buf, len, offset, aio); - if(err){ - reply = ((struct aio_thread_reply) { .data = aio, - .err = err }); - err = os_write_file(aio->reply_fd, &reply, sizeof(reply)); - if(err != sizeof(reply)) - printk("submit_aio_26 - write failed, " - "fd = %d, err = %d\n", aio->reply_fd, -err); - else err = 0; - } - - return err; + struct aio_thread_reply reply; + int err; + + err = do_aio(ctx, type, io_fd, buf, len, offset, aio); + if(err){ + reply = ((struct aio_thread_reply) { .data = aio, + .err = err }); + err = os_write_file(aio->reply_fd, &reply, sizeof(reply)); + if(err != sizeof(reply)) + printk("submit_aio_26 - write failed, " + "fd = %d, err = %d\n", aio->reply_fd, -err); + else err = 0; + } + + return err; } #else #define DEFAULT_24_AIO 1 static int init_aio_26(void) { - return -ENOSYS; + return -ENOSYS; } static int submit_aio_26(enum aio_type type, int io_fd, char *buf, int len, unsigned long long offset, struct aio_context *aio) { - return -ENOSYS; + return -ENOSYS; } #endif @@ -310,8 +312,8 @@ static int aio_24 = DEFAULT_24_AIO; static int __init set_aio_24(char *name, int *add) { - aio_24 = 1; - return 0; + aio_24 = 1; + return 0; } __uml_setup("aio=2.4", set_aio_24, @@ -328,28 +330,27 @@ __uml_setup("aio=2.4", set_aio_24, static int init_aio(void) { - int err; - - CHOOSE_MODE(({ - if(!aio_24){ - printk("Disabling 2.6 AIO in tt mode\n"); - aio_24 = 1; - } }), (void) 0); - - if(!aio_24){ - err = init_aio_26(); - if(err && (errno == ENOSYS)){ - printk("2.6 AIO not supported on the host - " - "reverting to 2.4 AIO\n"); - aio_24 = 1; - } - else return err; - } - - if(aio_24) - return init_aio_24(); - - return 0; + int err; + + CHOOSE_MODE(({ if(!aio_24){ + printk("Disabling 2.6 AIO in tt mode\n"); + aio_24 = 1; + } }), (void) 0); + + if(!aio_24){ + err = init_aio_26(); + if(err && (errno == ENOSYS)){ + printk("2.6 AIO not supported on the host - " + "reverting to 2.4 AIO\n"); + aio_24 = 1; + } + else return err; + } + + if(aio_24) + return init_aio_24(); + + return 0; } /* The reason for the __initcall/__uml_exitcall asymmetry is that init_aio @@ -362,8 +363,8 @@ __initcall(init_aio); static void exit_aio(void) { - if(aio_pid != -1) - os_kill_process(aio_pid, 1); + if(aio_pid != -1) + os_kill_process(aio_pid, 1); } __uml_exitcall(exit_aio); @@ -371,30 +372,30 @@ __uml_exitcall(exit_aio); static int submit_aio_24(enum aio_type type, int io_fd, char *buf, int len, unsigned long long offset, struct aio_context *aio) { - struct aio_thread_req req = { .type = type, - .io_fd = io_fd, - .offset = offset, - .buf = buf, - .len = len, - .aio = aio, - }; - int err; - - err = os_write_file(aio_req_fd_w, &req, sizeof(req)); - if(err == sizeof(req)) - err = 0; - - return err; + struct aio_thread_req req = { .type = type, + .io_fd = io_fd, + .offset = offset, + .buf = buf, + .len = len, + .aio = aio, + }; + int err; + + err = os_write_file(aio_req_fd_w, &req, sizeof(req)); + if(err == sizeof(req)) + err = 0; + + return err; } int submit_aio(enum aio_type type, int io_fd, char *buf, int len, - unsigned long long offset, int reply_fd, - struct aio_context *aio) + unsigned long long offset, int reply_fd, + struct aio_context *aio) { - aio->reply_fd = reply_fd; - if(aio_24) - return submit_aio_24(type, io_fd, buf, len, offset, aio); - else { - return submit_aio_26(type, io_fd, buf, len, offset, aio); - } + aio->reply_fd = reply_fd; + if(aio_24) + return submit_aio_24(type, io_fd, buf, len, offset, aio); + else { + return submit_aio_26(type, io_fd, buf, len, offset, aio); + } } diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c index 37517d4..29a9e3f 100644 --- a/arch/um/os-Linux/start_up.c +++ b/arch/um/os-Linux/start_up.c @@ -116,16 +116,16 @@ static int stop_ptraced_child(int pid, void *stack, int exitcode, if(!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) { int exit_with = WEXITSTATUS(status); if (exit_with == 2) - printk("check_ptrace : child exited with status 2. " + printf("check_ptrace : child exited with status 2. " "Serious trouble happening! Try updating your " "host skas patch!\nDisabling SYSEMU support."); - printk("check_ptrace : child exited with exitcode %d, while " + printf("check_ptrace : child exited with exitcode %d, while " "expecting %d; status 0x%x", exit_with, exitcode, status); if (mustpanic) panic("\n"); else - printk("\n"); + printf("\n"); ret = -1; } @@ -183,7 +183,7 @@ static void __init check_sysemu(void) void *stack; int pid, n, status, count=0; - printk("Checking syscall emulation patch for ptrace..."); + printf("Checking syscall emulation patch for ptrace..."); sysemu_supported = 0; pid = start_ptraced_child(&stack); @@ -207,10 +207,10 @@ static void __init check_sysemu(void) goto fail_stopped; sysemu_supported = 1; - printk("OK\n"); + printf("OK\n"); set_using_sysemu(!force_sysemu_disabled); - printk("Checking advanced syscall emulation patch for ptrace..."); + printf("Checking advanced syscall emulation patch for ptrace..."); pid = start_ptraced_child(&stack); if(ptrace(PTRACE_OLDSETOPTIONS, pid, 0, @@ -246,7 +246,7 @@ static void __init check_sysemu(void) goto fail_stopped; sysemu_supported = 2; - printk("OK\n"); + printf("OK\n"); if ( !force_sysemu_disabled ) set_using_sysemu(sysemu_supported); @@ -255,7 +255,7 @@ static void __init check_sysemu(void) fail: stop_ptraced_child(pid, stack, 1, 0); fail_stopped: - printk("missing\n"); + printf("missing\n"); } static void __init check_ptrace(void) @@ -263,7 +263,7 @@ static void __init check_ptrace(void) void *stack; int pid, syscall, n, status; - printk("Checking that ptrace can change system call numbers..."); + printf("Checking that ptrace can change system call numbers..."); pid = start_ptraced_child(&stack); if(ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0) @@ -292,7 +292,7 @@ static void __init check_ptrace(void) } } stop_ptraced_child(pid, stack, 0, 1); - printk("OK\n"); + printf("OK\n"); check_sysemu(); } @@ -472,6 +472,8 @@ int can_do_skas(void) int have_devanon = 0; +/* Runs on boot kernel stack - already safe to use printk. */ + void check_devanon(void) { int fd; diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c new file mode 100644 index 0000000..ecf107a --- /dev/null +++ b/arch/um/os-Linux/umid.c @@ -0,0 +1,335 @@ +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <signal.h> +#include <dirent.h> +#include <sys/fcntl.h> +#include <sys/stat.h> +#include <sys/param.h> +#include "init.h" +#include "os.h" +#include "user.h" +#include "mode.h" + +#define UML_DIR "~/.uml/" + +#define UMID_LEN 64 + +/* Changed by set_umid, which is run early in boot */ +char umid[UMID_LEN] = { 0 }; + +/* Changed by set_uml_dir and make_uml_dir, which are run early in boot */ +static char *uml_dir = UML_DIR; + +static int __init make_uml_dir(void) +{ + char dir[512] = { '\0' }; + int len, err; + + if(*uml_dir == '~'){ + char *home = getenv("HOME"); + + err = -ENOENT; + if(home == NULL){ + printk("make_uml_dir : no value in environment for " + "$HOME\n"); + goto err; + } + strlcpy(dir, home, sizeof(dir)); + uml_dir++; + } + strlcat(dir, uml_dir, sizeof(dir)); + len = strlen(dir); + if (len > 0 && dir[len - 1] != '/') + strlcat(dir, "/", sizeof(dir)); + + err = -ENOMEM; + uml_dir = malloc(strlen(dir) + 1); + if (uml_dir == NULL) { + printf("make_uml_dir : malloc failed, errno = %d\n", errno); + goto err; + } + strcpy(uml_dir, dir); + + if((mkdir(uml_dir, 0777) < 0) && (errno != EEXIST)){ + printf("Failed to mkdir '%s': %s\n", uml_dir, strerror(errno)); + err = -errno; + goto err_free; + } + return 0; + +err_free: + free(uml_dir); +err: + uml_dir = NULL; + return err; +} + +static int actually_do_remove(char *dir) +{ + DIR *directory; + struct dirent *ent; + int len; + char file[256]; + + directory = opendir(dir); + if(directory == NULL) + return -errno; + + while((ent = readdir(directory)) != NULL){ + if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, "..")) + continue; + len = strlen(dir) + sizeof("/") + strlen(ent->d_name) + 1; + if(len > sizeof(file)) + return -E2BIG; + + sprintf(file, "%s/%s", dir, ent->d_name); + if(unlink(file) < 0) + return -errno; + } + if(rmdir(dir) < 0) + return -errno; + + return 0; +} + +/* This says that there isn't already a user of the specified directory even if + * there are errors during the checking. This is because if these errors + * happen, the directory is unusable by the pre-existing UML, so we might as + * well take it over. This could happen either by + * the existing UML somehow corrupting its umid directory + * something other than UML sticking stuff in the directory + * this boot racing with a shutdown of the other UML + * In any of these cases, the directory isn't useful for anything else. + */ + +static int not_dead_yet(char *dir) +{ + char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")]; + char pid[sizeof("nnnnn\0")], *end; + int dead, fd, p, n, err; + + n = snprintf(file, sizeof(file), "%s/pid", dir); + if(n >= sizeof(file)){ + printk("not_dead_yet - pid filename too long\n"); + err = -E2BIG; + goto out; + } + + dead = 0; + fd = open(file, O_RDONLY); + if(fd < 0){ + if(fd != -ENOENT){ + printk("not_dead_yet : couldn't open pid file '%s', " + "err = %d\n", file, -fd); + } + goto out; + } + + err = 0; + n = read(fd, pid, sizeof(pid)); + if(n <= 0){ + printk("not_dead_yet : couldn't read pid file '%s', " + "err = %d\n", file, -n); + goto out_close; + } + + p = strtoul(pid, &end, 0); + if(end == pid){ + printk("not_dead_yet : couldn't parse pid file '%s', " + "errno = %d\n", file, errno); + goto out_close; + } + + if((kill(p, 0) == 0) || (errno != ESRCH)) + return 1; + + err = actually_do_remove(dir); + if(err) + printk("not_dead_yet - actually_do_remove failed with " + "err = %d\n", err); + + return err; + + out_close: + close(fd); + out: + return 0; +} + +static void __init create_pid_file(void) +{ + char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")]; + char pid[sizeof("nnnnn\0")]; + int fd, n; + + if(umid_file_name("pid", file, sizeof(file))) + return; + + fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0644); + if(fd < 0){ + printk("Open of machine pid file \"%s\" failed: %s\n", + file, strerror(-fd)); + return; + } + + snprintf(pid, sizeof(pid), "%d\n", getpid()); + n = write(fd, pid, strlen(pid)); + if(n != strlen(pid)) + printk("Write of pid file failed - err = %d\n", -n); + + close(fd); +} + +int __init set_umid(char *name) +{ + if(strlen(name) > UMID_LEN - 1) + return -E2BIG; + + strlcpy(umid, name, sizeof(umid)); + + return 0; +} + +static int umid_setup = 0; + +int __init make_umid(void) +{ + int fd, err; + char tmp[256]; + + if(umid_setup) + return 0; + + make_uml_dir(); + + if(*umid == '\0'){ + strlcpy(tmp, uml_dir, sizeof(tmp)); + strlcat(tmp, "XXXXXX", sizeof(tmp)); + fd = mkstemp(tmp); + if(fd < 0){ + printk("make_umid - mkstemp(%s) failed: %s\n", + tmp, strerror(errno)); + err = -errno; + goto err; + } + + close(fd); + + set_umid(&tmp[strlen(uml_dir)]); + + /* There's a nice tiny little race between this unlink and + * the mkdir below. It'd be nice if there were a mkstemp + * for directories. + */ + if(unlink(tmp)){ + err = -errno; + goto err; + } + } + + snprintf(tmp, sizeof(tmp), "%s%s", uml_dir, umid); + err = mkdir(tmp, 0777); + if(err < 0){ + err = -errno; + if(errno != EEXIST) + goto err; + + if(not_dead_yet(tmp) < 0) + goto err; + + err = mkdir(tmp, 0777); + } + if(err < 0){ + printk("Failed to create '%s' - err = %d\n", umid, err); + goto err_rmdir; + } + + umid_setup = 1; + + create_pid_file(); + + return 0; + + err_rmdir: + rmdir(tmp); + err: + return err; +} + +static int __init make_umid_init(void) +{ + make_umid(); + + return 0; +} + +__initcall(make_umid_init); + +int __init umid_file_name(char *name, char *buf, int len) +{ + int n, err; + + err = make_umid(); + if(err) + return err; + + n = snprintf(buf, len, "%s%s/%s", uml_dir, umid, name); + if(n >= len){ + printk("umid_file_name : buffer too short\n"); + return -E2BIG; + } + + return 0; +} + +char *get_umid(void) +{ + return umid; +} + +static int __init set_uml_dir(char *name, int *add) +{ + if(*name == '\0'){ + printf("uml_dir can't be an empty string\n"); + return 0; + } + + if(name[strlen(name) - 1] == '/'){ + uml_dir = name; + return 0; + } + + uml_dir = malloc(strlen(name) + 2); + if(uml_dir == NULL){ + printf("Failed to malloc uml_dir - error = %d\n", errno); + + /* Return 0 here because do_initcalls doesn't look at + * the return value. + */ + return 0; + } + sprintf(uml_dir, "%s/", name); + + return 0; +} + +__uml_setup("uml_dir=", set_uml_dir, +"uml_dir=<directory>\n" +" The location to place the pid and umid files.\n\n" +); + +static void remove_umid_dir(void) +{ + char dir[strlen(uml_dir) + UMID_LEN + 1], err; + + sprintf(dir, "%s%s", uml_dir, umid); + err = actually_do_remove(dir); + if(err) + printf("remove_umid_dir - actually_do_remove failed with " + "err = %d\n", err); +} + +__uml_exitcall(remove_umid_dir); diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c index 56d3f87..8da6ab3 100644 --- a/arch/um/os-Linux/user_syms.c +++ b/arch/um/os-Linux/user_syms.c @@ -34,6 +34,11 @@ EXPORT_SYMBOL(strstr); int sym(void); \ EXPORT_SYMBOL(sym); +extern void readdir64(void) __attribute__((weak)); +EXPORT_SYMBOL(readdir64); +extern void truncate64(void) __attribute__((weak)); +EXPORT_SYMBOL(truncate64); + #ifdef SUBARCH_i386 EXPORT_SYMBOL(vsyscall_ehdr); EXPORT_SYMBOL(vsyscall_end); |