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- /* portability.c - code to workaround the deficiencies of various platforms.
- *
- * Copyright 2012 Rob Landley <rob@landley.net>
- * Copyright 2012 Georgi Chorbadzhiyski <gf@unixsol.org>
- */
- #include "toys.h"
- // We can't fork() on nommu systems, and vfork() requires an exec() or exit()
- // before resuming the parent (because they share a heap until then). And no,
- // we can't implement our own clone() call that does the equivalent of fork()
- // because nommu heaps use physical addresses so if we copy the heap all our
- // pointers are wrong. (You need an mmu in order to map two heaps to the same
- // address range without interfering with each other.) In the absence of
- // a portable way to tell malloc() to start a new heap without freeing the old
- // one, you pretty much need the exec().)
- // So we exec ourselves (via /proc/self/exe, if anybody knows a way to
- // re-exec self without depending on the filesystem, I'm all ears),
- // and use the arguments to signal reentry.
- #if CFG_TOYBOX_FORK
- pid_t xfork(void)
- {
- pid_t pid = fork();
- if (pid < 0) perror_exit("fork");
- return pid;
- }
- #endif
- int xgetrandom(void *buf, unsigned buflen, unsigned flags)
- {
- int fd;
- #if CFG_TOYBOX_GETRANDOM
- if (buflen == getrandom(buf, buflen, flags&~WARN_ONLY)) return 1;
- if (errno!=ENOSYS && !(flags&WARN_ONLY)) perror_exit("getrandom");
- #endif
- fd = xopen(flags ? "/dev/random" : "/dev/urandom",O_RDONLY|(flags&WARN_ONLY));
- if (fd == -1) return 0;
- xreadall(fd, buf, buflen);
- close(fd);
- return 1;
- }
- // Get list of mounted filesystems, including stat and statvfs info.
- // Returns a reversed list, which is good for finding overmounts and such.
- #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
- #include <sys/mount.h>
- struct mtab_list *xgetmountlist(char *path)
- {
- struct mtab_list *mtlist = 0, *mt;
- struct statfs *entries;
- int i, count;
- if (path) error_exit("xgetmountlist");
- if ((count = getmntinfo(&entries, 0)) == 0) perror_exit("getmntinfo");
- // The "test" part of the loop is done before the first time through and
- // again after each "increment", so putting the actual load there avoids
- // duplicating it. If the load was NULL, the loop stops.
- for (i = 0; i < count; ++i) {
- struct statfs *me = &entries[i];
- mt = xzalloc(sizeof(struct mtab_list) + strlen(me->f_fstypename) +
- strlen(me->f_mntonname) + strlen(me->f_mntfromname) + strlen("") + 4);
- dlist_add_nomalloc((void *)&mtlist, (void *)mt);
- // Collect details about mounted filesystem.
- // Don't report errors, just leave data zeroed.
- stat(me->f_mntonname, &(mt->stat));
- statvfs(me->f_mntonname, &(mt->statvfs));
- // Remember information from struct statfs.
- mt->dir = stpcpy(mt->type, me->f_fstypename)+1;
- mt->device = stpcpy(mt->dir, me->f_mntonname)+1;
- mt->opts = stpcpy(mt->device, me->f_mntfromname)+1;
- strcpy(mt->opts, ""); /* TODO: reverse from f_flags? */
- }
- return mtlist;
- }
- #else
- #include <mntent.h>
- static void octal_deslash(char *s)
- {
- char *o = s;
- while (*s) {
- if (*s == '\\') {
- int i, oct = 0;
- for (i = 1; i < 4; i++) {
- if (!isdigit(s[i])) break;
- oct = (oct<<3)+s[i]-'0';
- }
- if (i == 4) {
- *o++ = oct;
- s += i;
- continue;
- }
- }
- *o++ = *s++;
- }
- *o = 0;
- }
- // Check if this type matches list.
- // Odd syntax: typelist all yes = if any, typelist all no = if none.
- int mountlist_istype(struct mtab_list *ml, char *typelist)
- {
- int len, skip;
- char *t;
- if (!typelist) return 1;
- // leading "no" indicates whether entire list is inverted
- skip = strncmp(typelist, "no", 2);
- for (;;) {
- if (!(t = comma_iterate(&typelist, &len))) break;
- if (!skip) {
- // later "no" after first are ignored
- strstart(&t, "no");
- if (!strncmp(t, ml->type, len-2)) {
- skip = 1;
- break;
- }
- } else if (!strncmp(t, ml->type, len) && !ml->type[len]) {
- skip = 0;
- break;
- }
- }
- return !skip;
- }
- struct mtab_list *xgetmountlist(char *path)
- {
- struct mtab_list *mtlist = 0, *mt;
- struct mntent *me;
- FILE *fp;
- char *p = path ? path : "/proc/mounts";
- if (!(fp = setmntent(p, "r"))) perror_exit("bad %s", p);
- // The "test" part of the loop is done before the first time through and
- // again after each "increment", so putting the actual load there avoids
- // duplicating it. If the load was NULL, the loop stops.
- while ((me = getmntent(fp))) {
- mt = xzalloc(sizeof(struct mtab_list) + strlen(me->mnt_fsname) +
- strlen(me->mnt_dir) + strlen(me->mnt_type) + strlen(me->mnt_opts) + 4);
- dlist_add_nomalloc((void *)&mtlist, (void *)mt);
- // Collect details about mounted filesystem
- // Don't report errors, just leave data zeroed
- if (!path) {
- stat(me->mnt_dir, &(mt->stat));
- statvfs(me->mnt_dir, &(mt->statvfs));
- }
- // Remember information from /proc/mounts
- mt->dir = stpcpy(mt->type, me->mnt_type)+1;
- mt->device = stpcpy(mt->dir, me->mnt_dir)+1;
- mt->opts = stpcpy(mt->device, me->mnt_fsname)+1;
- strcpy(mt->opts, me->mnt_opts);
- octal_deslash(mt->dir);
- octal_deslash(mt->device);
- }
- endmntent(fp);
- return mtlist;
- }
- #endif
- #if defined(__APPLE__) || defined(__OpenBSD__)
- #include <sys/event.h>
- struct xnotify *xnotify_init(int max)
- {
- struct xnotify *not = xzalloc(sizeof(struct xnotify));
- not->max = max;
- if ((not->kq = kqueue()) == -1) perror_exit("kqueue");
- not->paths = xmalloc(max * sizeof(char *));
- not->fds = xmalloc(max * sizeof(int));
- return not;
- }
- int xnotify_add(struct xnotify *not, int fd, char *path)
- {
- struct kevent event;
- if (not->count == not->max) error_exit("xnotify_add overflow");
- EV_SET(&event, fd, EVFILT_VNODE, EV_ADD|EV_CLEAR, NOTE_WRITE, 0, NULL);
- if (kevent(not->kq, &event, 1, NULL, 0, NULL) == -1 || event.flags & EV_ERROR)
- error_exit("xnotify_add failed on %s", path);
- not->paths[not->count] = path;
- not->fds[not->count++] = fd;
- return 0;
- }
- int xnotify_wait(struct xnotify *not, char **path)
- {
- struct kevent event;
- int i;
- for (;;) {
- if (kevent(not->kq, NULL, 0, &event, 1, NULL) != -1) {
- // We get the fd for free, but still have to search for the path.
- for (i = 0; i<not->count; i++) if (not->fds[i]==event.ident) {
- *path = not->paths[i];
- return event.ident;
- }
- }
- }
- }
- #else
- #include <sys/inotify.h>
- struct xnotify *xnotify_init(int max)
- {
- struct xnotify *not = xzalloc(sizeof(struct xnotify));
- not->max = max;
- if ((not->kq = inotify_init()) < 0) perror_exit("inotify_init");
- not->paths = xmalloc(max * sizeof(char *));
- not->fds = xmalloc(max * 2 * sizeof(int));
- return not;
- }
- int xnotify_add(struct xnotify *not, int fd, char *path)
- {
- int i = 2*not->count;
- if (not->max == not->count) error_exit("xnotify_add overflow");
- if ((not->fds[i] = inotify_add_watch(not->kq, path, IN_MODIFY))==-1)
- perror_exit("xnotify_add failed on %s", path);
- not->fds[i+1] = fd;
- not->paths[not->count++] = path;
- return 0;
- }
- int xnotify_wait(struct xnotify *not, char **path)
- {
- struct inotify_event ev;
- int i;
- for (;;) {
- if (sizeof(ev)!=read(not->kq, &ev, sizeof(ev))) perror_exit("inotify");
- for (i = 0; i<not->count; i++) if (ev.wd==not->fds[2*i]) {
- *path = not->paths[i];
- return not->fds[2*i+1];
- }
- }
- }
- #endif
- #ifdef __APPLE__
- ssize_t xattr_get(const char *path, const char *name, void *value, size_t size)
- {
- return getxattr(path, name, value, size, 0, 0);
- }
- ssize_t xattr_lget(const char *path, const char *name, void *value, size_t size)
- {
- return getxattr(path, name, value, size, 0, XATTR_NOFOLLOW);
- }
- ssize_t xattr_fget(int fd, const char *name, void *value, size_t size)
- {
- return fgetxattr(fd, name, value, size, 0, 0);
- }
- ssize_t xattr_list(const char *path, char *list, size_t size)
- {
- return listxattr(path, list, size, 0);
- }
- ssize_t xattr_llist(const char *path, char *list, size_t size)
- {
- return listxattr(path, list, size, XATTR_NOFOLLOW);
- }
- ssize_t xattr_flist(int fd, char *list, size_t size)
- {
- return flistxattr(fd, list, size, 0);
- }
- ssize_t xattr_set(const char* path, const char* name,
- const void* value, size_t size, int flags)
- {
- return setxattr(path, name, value, size, 0, flags);
- }
- ssize_t xattr_lset(const char* path, const char* name,
- const void* value, size_t size, int flags)
- {
- return setxattr(path, name, value, size, 0, flags | XATTR_NOFOLLOW);
- }
- ssize_t xattr_fset(int fd, const char* name,
- const void* value, size_t size, int flags)
- {
- return fsetxattr(fd, name, value, size, 0, flags);
- }
- #elif !defined(__OpenBSD__)
- ssize_t xattr_get(const char *path, const char *name, void *value, size_t size)
- {
- return getxattr(path, name, value, size);
- }
- ssize_t xattr_lget(const char *path, const char *name, void *value, size_t size)
- {
- return lgetxattr(path, name, value, size);
- }
- ssize_t xattr_fget(int fd, const char *name, void *value, size_t size)
- {
- return fgetxattr(fd, name, value, size);
- }
- ssize_t xattr_list(const char *path, char *list, size_t size)
- {
- return listxattr(path, list, size);
- }
- ssize_t xattr_llist(const char *path, char *list, size_t size)
- {
- return llistxattr(path, list, size);
- }
- ssize_t xattr_flist(int fd, char *list, size_t size)
- {
- return flistxattr(fd, list, size);
- }
- ssize_t xattr_set(const char* path, const char* name,
- const void* value, size_t size, int flags)
- {
- return setxattr(path, name, value, size, flags);
- }
- ssize_t xattr_lset(const char* path, const char* name,
- const void* value, size_t size, int flags)
- {
- return lsetxattr(path, name, value, size, flags);
- }
- ssize_t xattr_fset(int fd, const char* name,
- const void* value, size_t size, int flags)
- {
- return fsetxattr(fd, name, value, size, flags);
- }
- #endif
- #ifdef __APPLE__
- // In the absence of a mknodat system call, fchdir to dirfd and back
- // around a regular mknod call...
- int mknodat(int dirfd, const char *path, mode_t mode, dev_t dev)
- {
- int old_dirfd = open(".", O_RDONLY), result;
- if (old_dirfd == -1 || fchdir(dirfd) == -1) return -1;
- result = mknod(path, mode, dev);
- if (fchdir(old_dirfd) == -1) perror_exit("mknodat couldn't return");
- return result;
- }
- // As of 10.15, macOS offers an fcntl F_PREALLOCATE rather than fallocate()
- // or posix_fallocate() calls.
- int posix_fallocate(int fd, off_t offset, off_t length)
- {
- int e = errno, result;
- fstore_t f;
- f.fst_flags = F_ALLOCATEALL;
- f.fst_posmode = F_PEOFPOSMODE;
- f.fst_offset = offset;
- f.fst_length = length;
- if (fcntl(fd, F_PREALLOCATE, &f) == -1) result = errno;
- else result = ftruncate(fd, length);
- errno = e;
- return result;
- }
- #endif
- // Signals required by POSIX 2008:
- // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html
- #define SIGNIFY(x) {SIG##x, #x}
- static const struct signame signames[] = {
- {0, "0"},
- // POSIX
- SIGNIFY(ABRT), SIGNIFY(ALRM), SIGNIFY(BUS),
- SIGNIFY(FPE), SIGNIFY(HUP), SIGNIFY(ILL), SIGNIFY(INT), SIGNIFY(KILL),
- SIGNIFY(PIPE), SIGNIFY(QUIT), SIGNIFY(SEGV), SIGNIFY(TERM),
- SIGNIFY(USR1), SIGNIFY(USR2), SIGNIFY(SYS), SIGNIFY(TRAP),
- SIGNIFY(VTALRM), SIGNIFY(XCPU), SIGNIFY(XFSZ),
- // Non-POSIX signals that cause termination
- SIGNIFY(PROF), SIGNIFY(IO),
- // signals only present/absent on some targets (mips and macos)
- #ifdef SIGEMT
- SIGNIFY(EMT),
- #endif
- #ifdef SIGINFO
- SIGNIFY(INFO),
- #endif
- #ifdef SIGPOLL
- SIGNIFY(POLL),
- #endif
- #ifdef SIGPWR
- SIGNIFY(PWR),
- #endif
- #ifdef SIGSTKFLT
- SIGNIFY(STKFLT),
- #endif
- // Note: sigatexit relies on all the signals with a default disposition that
- // terminates the process coming *before* SIGCHLD.
- // POSIX signals that don't cause termination
- SIGNIFY(CHLD), SIGNIFY(CONT), SIGNIFY(STOP), SIGNIFY(TSTP),
- SIGNIFY(TTIN), SIGNIFY(TTOU), SIGNIFY(URG),
- // Non-POSIX signals that don't cause termination
- SIGNIFY(WINCH),
- };
- #undef SIGNIFY
- void xsignal_all_killers(void *handler)
- {
- int i;
- for (i = 1; signames[i].num != SIGCHLD; i++)
- if (signames[i].num != SIGKILL) xsignal(signames[i].num, handler);
- }
- // Convert a string like "9", "KILL", "SIGHUP", or "SIGRTMIN+2" to a number.
- int sig_to_num(char *sigstr)
- {
- int i, offset;
- char *s;
- // Numeric?
- offset = estrtol(sigstr, &s, 10);
- if (!errno && !*s) return offset;
- // Skip leading "SIG".
- strcasestart(&sigstr, "sig");
- // Named signal?
- for (i=0; i<ARRAY_LEN(signames); i++)
- if (!strcasecmp(sigstr, signames[i].name)) return signames[i].num;
- // Real-time signal?
- #ifdef SIGRTMIN
- if (strcasestart(&sigstr, "rtmin")) i = SIGRTMIN;
- else if (strcasestart(&sigstr, "rtmax")) i = SIGRTMAX;
- else return -1;
- // No offset?
- if (!*sigstr) return i;
- // We allow any offset that's still a real-time signal: SIGRTMIN+20 is fine.
- // Others are more restrictive, only accepting what they show with -l.
- offset = estrtol(sigstr, &s, 10);
- if (errno || *s) return -1;
- i += offset;
- if (i >= SIGRTMIN && i <= SIGRTMAX) return i;
- #endif
- return -1;
- }
- char *num_to_sig(int sig)
- {
- int i;
- // A named signal?
- for (i=0; i<ARRAY_LEN(signames); i++)
- if (signames[i].num == sig) return signames[i].name;
- // A real-time signal?
- #ifdef SIGRTMIN
- if (sig == SIGRTMIN) return "RTMIN";
- if (sig == SIGRTMAX) return "RTMAX";
- if (sig > SIGRTMIN && sig < SIGRTMAX) {
- if (sig-SIGRTMIN <= SIGRTMAX-sig) sprintf(libbuf, "RTMIN+%d", sig-SIGRTMIN);
- else sprintf(libbuf, "RTMAX-%d", SIGRTMAX-sig);
- return libbuf;
- }
- #endif
- return NULL;
- }
- int dev_minor(int dev)
- {
- #if defined(__linux__)
- return ((dev&0xfff00000)>>12)|(dev&0xff);
- #elif defined(__APPLE__)
- return dev&0xffffff;
- #elif defined(__OpenBSD__)
- return minor(dev);
- #else
- #error
- #endif
- }
- int dev_major(int dev)
- {
- #if defined(__linux__)
- return (dev&0xfff00)>>8;
- #elif defined(__APPLE__)
- return (dev>>24)&0xff;
- #elif defined(__OpenBSD__)
- return major(dev);
- #else
- #error
- #endif
- }
- int dev_makedev(int major, int minor)
- {
- #if defined(__linux__)
- return (minor&0xff)|((major&0xfff)<<8)|((minor&0xfff00)<<12);
- #elif defined(__APPLE__)
- return (minor&0xffffff)|((major&0xff)<<24);
- #elif defined(__OpenBSD__)
- return makedev(major, minor);
- #else
- #error
- #endif
- }
- char *fs_type_name(struct statfs *statfs)
- {
- #if defined(__APPLE__) || defined(__OpenBSD__)
- // macOS has an `f_type` field, but assigns values dynamically as filesystems
- // are registered. They do give you the name directly though, so use that.
- return statfs->f_fstypename;
- #else
- char *s = NULL;
- struct {unsigned num; char *name;} nn[] = {
- {0xADFF, "affs"}, {0x5346544e, "ntfs"}, {0x1Cd1, "devpts"},
- {0x137D, "ext"}, {0xEF51, "ext2"}, {0xEF53, "ext3"},
- {0x1BADFACE, "bfs"}, {0x9123683E, "btrfs"}, {0x28cd3d45, "cramfs"},
- {0x3153464a, "jfs"}, {0x7275, "romfs"}, {0x01021994, "tmpfs"},
- {0x3434, "nilfs"}, {0x6969, "nfs"}, {0x9fa0, "proc"},
- {0x534F434B, "sockfs"}, {0x62656572, "sysfs"}, {0x517B, "smb"},
- {0x4d44, "msdos"}, {0x4006, "fat"}, {0x43415d53, "smackfs"},
- {0x73717368, "squashfs"}
- };
- int i;
- for (i=0; i<ARRAY_LEN(nn); i++)
- if (nn[i].num == statfs->f_type) s = nn[i].name;
- if (!s) sprintf(s = libbuf, "0x%x", (unsigned)statfs->f_type);
- return s;
- #endif
- }
- #if defined(__APPLE__)
- #include <sys/disk.h>
- int get_block_device_size(int fd, unsigned long long* size)
- {
- unsigned long block_size, block_count;
- if (!ioctl(fd, DKIOCGETBLOCKSIZE, &block_size) &&
- !ioctl(fd, DKIOCGETBLOCKCOUNT, &block_count)) {
- *size = block_count * block_size;
- return 1;
- }
- return 0;
- }
- #elif defined(__linux__)
- int get_block_device_size(int fd, unsigned long long* size)
- {
- return (ioctl(fd, BLKGETSIZE64, size) >= 0);
- }
- #elif defined(__OpenBSD__)
- #include <sys/dkio.h>
- #include <sys/disklabel.h>
- int get_block_device_size(int fd, unsigned long long* size)
- {
- struct disklabel lab;
- int status = (ioctl(fd, DIOCGDINFO, &lab) >= 0);
- *size = lab.d_secsize * lab.d_nsectors;
- return status;
- }
- #endif
- ssize_t copy_file_range_wrap(int infd, off_t *inoff, int outfd,
- off_t *outoff, size_t len, unsigned flags)
- {
- #if defined(__linux__)
- return syscall(__NR_copy_file_range, infd, inoff, outfd, outoff, len, flags);
- #else
- errno = EINVAL;
- return -1;
- #endif
- }
- // Return bytes copied from in to out. If bytes <0 copy all of in to out.
- // If consumed isn't null, amount read saved there (return is written or error)
- long long sendfile_len(int in, int out, long long bytes, long long *consumed)
- {
- long long total = 0, len, ww;
- int copy_file_range = CFG_TOYBOX_COPYFILERANGE;
- if (consumed) *consumed = 0;
- if (in<0) return 0;
- while (bytes != total) {
- ww = 0;
- len = bytes-total;
- errno = 0;
- if (copy_file_range) {
- if (bytes<0 || bytes>(1<<30)) len = (1<<30);
- len = copy_file_range_wrap(in, 0, out, 0, len, 0);
- if (len < 0 && errno == EINVAL) {
- copy_file_range = 0;
- continue;
- }
- }
- if (!copy_file_range) {
- if (bytes<0 || len>sizeof(libbuf)) len = sizeof(libbuf);
- ww = len = read(in, libbuf, len);
- }
- if (len<1 && errno==EAGAIN) continue;
- if (len<1) break;
- if (consumed) *consumed += len;
- if (ww && writeall(out, libbuf, len) != len) return -1;
- total += len;
- }
- return total;
- }
- #ifdef __APPLE__
- // The absolute minimum POSIX timer implementation to build timeout(1).
- // Note that although timeout(1) uses POSIX timers to get the monotonic clock,
- // that doesn't seem to be an option on macOS (without using other libraries),
- // so we just mangle that back into a regular setitimer(ITIMER_REAL) call.
- int timer_create(clock_t c, struct sigevent *se, timer_t *t)
- {
- if (se->sigev_notify != SIGEV_SIGNAL || se->sigev_signo != SIGALRM)
- error_exit("unimplemented");
- *t = 1;
- return 0;
- }
- int timer_settime(timer_t t, int flags, struct itimerspec *new, void *old)
- {
- struct itimerval mangled;
- if (flags != 0 || old != 0) error_exit("unimplemented");
- memset(&mangled, 0, sizeof(mangled));
- mangled.it_value.tv_sec = new->it_value.tv_sec;
- mangled.it_value.tv_usec = new->it_value.tv_nsec / 1000;
- return setitimer(ITIMER_REAL, &mangled, NULL);
- }
- // glibc requires -lrt for linux syscalls, which pulls in libgcc_eh.a for
- // static linking, and gcc 9.3 leaks pthread calls from that breaking the build
- // These are both just linux syscalls: wrap them ourselves
- #elif !CFG_TOYBOX_HASTIMERS
- int timer_create_wrap(clockid_t c, struct sigevent *se, timer_t *t)
- {
- // convert overengineered structure to what kernel actually uses
- struct ksigevent { void *sv; int signo, notify, tid; } kk = {
- 0, se->sigev_signo, se->sigev_notify, 0
- };
- int timer;
- if (syscall(SYS_timer_create, c, &kk, &timer)<0) return -1;
- *t = (timer_t)(long)timer;
- return 0;
- }
- int timer_settime_wrap(timer_t t, int flags, struct itimerspec *val,
- struct itimerspec *old)
- {
- return syscall(SYS_timer_settime, t, flags, val, old);
- }
- #endif
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