/* $NetBSD: redir.c,v 1.66 2019/03/01 06:15:01 kre Exp $ */ /*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Kenneth Almquist. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #ifndef lint #if 0 static char sccsid[] = "@(#)redir.c 8.2 (Berkeley) 5/4/95"; #else __RCSID("$NetBSD: redir.c,v 1.66 2019/03/01 06:15:01 kre Exp $"); #endif #endif /* not lint */ #include #include /* PIPE_BUF */ #include #include #include #include #include #include #include /* * Code for dealing with input/output redirection. */ #include "main.h" #include "builtins.h" #include "shell.h" #include "nodes.h" #include "jobs.h" #include "options.h" #include "expand.h" #include "redir.h" #include "output.h" #include "memalloc.h" #include "mystring.h" #include "error.h" #include "show.h" #define EMPTY -2 /* marks an unused slot in redirtab */ #define CLOSED -1 /* fd was not open before redir */ #ifndef PIPE_BUF # define PIPESIZE 4096 /* amount of buffering in a pipe */ #else # define PIPESIZE PIPE_BUF #endif #ifndef FD_CLOEXEC # define FD_CLOEXEC 1 /* well known from before there was a name */ #endif #ifndef F_DUPFD_CLOEXEC #define F_DUPFD_CLOEXEC F_DUPFD #define CLOEXEC(fd) (fcntl((fd), F_SETFD, fcntl((fd),F_GETFD) | FD_CLOEXEC)) #else #define CLOEXEC(fd) #endif MKINIT struct renamelist { struct renamelist *next; int orig; int into; }; MKINIT struct redirtab { struct redirtab *next; struct renamelist *renamed; }; MKINIT struct redirtab *redirlist; /* * We keep track of whether or not fd0 has been redirected. This is for * background commands, where we want to redirect fd0 to /dev/null only * if it hasn't already been redirected. */ STATIC int fd0_redirected = 0; /* * And also where to put internal use fds that should be out of the * way of user defined fds (normally) */ STATIC int big_sh_fd = 0; STATIC const struct renamelist *is_renamed(const struct renamelist *, int); STATIC void fd_rename(struct redirtab *, int, int); STATIC void free_rl(struct redirtab *, int); STATIC void openredirect(union node *, char[10], int); STATIC int openhere(const union node *); STATIC int copyfd(int, int, int); STATIC void find_big_fd(void); struct shell_fds { /* keep track of internal shell fds */ struct shell_fds *nxt; void (*cb)(int, int); int fd; }; STATIC struct shell_fds *sh_fd_list; STATIC void renumber_sh_fd(struct shell_fds *); STATIC struct shell_fds *sh_fd(int); STATIC const struct renamelist * is_renamed(const struct renamelist *rl, int fd) { while (rl != NULL) { if (rl->orig == fd) return rl; rl = rl->next; } return NULL; } STATIC void free_rl(struct redirtab *rt, int reset) { struct renamelist *rl, *rn = rt->renamed; while ((rl = rn) != NULL) { rn = rl->next; if (rl->orig == 0) fd0_redirected--; VTRACE(DBG_REDIR, ("popredir %d%s: %s", rl->orig, rl->orig==0 ? " (STDIN)" : "", reset ? "" : "no reset\n")); if (reset) { if (rl->into < 0) { VTRACE(DBG_REDIR, ("closed\n")); close(rl->orig); } else { VTRACE(DBG_REDIR, ("from %d\n", rl->into)); movefd(rl->into, rl->orig); } } ckfree(rl); } rt->renamed = NULL; } STATIC void fd_rename(struct redirtab *rt, int from, int to) { /* XXX someday keep a short list (8..10) of freed renamelists XXX */ struct renamelist *rl = ckmalloc(sizeof(struct renamelist)); rl->next = rt->renamed; rt->renamed = rl; rl->orig = from; rl->into = to; } /* * Process a list of redirection commands. If the REDIR_PUSH flag is set, * old file descriptors are stashed away so that the redirection can be * undone by calling popredir. If the REDIR_BACKQ flag is set, then the * standard output, and the standard error if it becomes a duplicate of * stdout, is saved in memory. */ void redirect(union node *redir, int flags) { union node *n; struct redirtab *sv = NULL; int i; int fd; char memory[10]; /* file descriptors to write to memory */ CTRACE(DBG_REDIR, ("redirect(F=0x%x):%s\n", flags, redir?"":" NONE")); for (i = 10 ; --i >= 0 ; ) memory[i] = 0; memory[1] = flags & REDIR_BACKQ; if (flags & REDIR_PUSH) { /* * We don't have to worry about REDIR_VFORK here, as * flags & REDIR_PUSH is never true if REDIR_VFORK is set. */ sv = ckmalloc(sizeof (struct redirtab)); sv->renamed = NULL; sv->next = redirlist; redirlist = sv; } for (n = redir ; n ; n = n->nfile.next) { fd = n->nfile.fd; VTRACE(DBG_REDIR, ("redir %d (max=%d) ", fd, max_user_fd)); if (fd > max_user_fd) max_user_fd = fd; renumber_sh_fd(sh_fd(fd)); if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) && n->ndup.dupfd == fd) { /* redirect from/to same file descriptor */ /* make sure it stays open */ if (fcntl(fd, F_SETFD, 0) < 0) error("fd %d: %s", fd, strerror(errno)); VTRACE(DBG_REDIR, ("!cloexec\n")); continue; } if ((flags & REDIR_PUSH) && !is_renamed(sv->renamed, fd)) { INTOFF; if (big_sh_fd < 10) find_big_fd(); if ((i = fcntl(fd, F_DUPFD, big_sh_fd)) == -1) { switch (errno) { case EBADF: i = CLOSED; break; case EMFILE: case EINVAL: find_big_fd(); i = fcntl(fd, F_DUPFD, big_sh_fd); if (i >= 0) break; /* FALLTHRU */ default: i = errno; error("%d: %s", fd, strerror(i)); /* NOTREACHED */ } } if (i >= 0) (void)fcntl(i, F_SETFD, FD_CLOEXEC); fd_rename(sv, fd, i); VTRACE(DBG_REDIR, ("saved as %d ", i)); INTON; } VTRACE(DBG_REDIR, ("%s\n", fd == 0 ? "STDIN" : "")); if (fd == 0) fd0_redirected++; openredirect(n, memory, flags); } if (memory[1]) out1 = &memout; if (memory[2]) out2 = &memout; } STATIC void openredirect(union node *redir, char memory[10], int flags) { struct stat sb; int fd = redir->nfile.fd; char *fname; int f; int eflags, cloexec; /* * We suppress interrupts so that we won't leave open file * descriptors around. This may not be such a good idea because * an open of a device or a fifo can block indefinitely. */ INTOFF; if (fd < 10) memory[fd] = 0; switch (redir->nfile.type) { case NFROM: fname = redir->nfile.expfname; if (flags & REDIR_VFORK) eflags = O_NONBLOCK; else eflags = 0; if ((f = open(fname, O_RDONLY|eflags)) < 0) goto eopen; VTRACE(DBG_REDIR, ("openredirect(< '%s') -> %d [%#x]", fname, f, eflags)); if (eflags) (void)fcntl(f, F_SETFL, fcntl(f, F_GETFL, 0) & ~eflags); break; case NFROMTO: fname = redir->nfile.expfname; if ((f = open(fname, O_RDWR|O_CREAT, 0666)) < 0) goto ecreate; VTRACE(DBG_REDIR, ("openredirect(<> '%s') -> %d", fname, f)); break; case NTO: if (Cflag) { fname = redir->nfile.expfname; if ((f = open(fname, O_WRONLY)) == -1) { if ((f = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666)) < 0) goto ecreate; } else if (fstat(f, &sb) == -1) { int serrno = errno; close(f); errno = serrno; goto ecreate; } else if (S_ISREG(sb.st_mode)) { close(f); errno = EEXIST; goto ecreate; } VTRACE(DBG_REDIR, ("openredirect(>| '%s') -> %d", fname, f)); break; } /* FALLTHROUGH */ case NCLOBBER: fname = redir->nfile.expfname; if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0) goto ecreate; VTRACE(DBG_REDIR, ("openredirect(> '%s') -> %d", fname, f)); break; case NAPPEND: fname = redir->nfile.expfname; if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0) goto ecreate; VTRACE(DBG_REDIR, ("openredirect(>> '%s') -> %d", fname, f)); break; case NTOFD: case NFROMFD: if (redir->ndup.dupfd >= 0) { /* if not ">&-" */ if (fd < 10 && redir->ndup.dupfd < 10 && memory[redir->ndup.dupfd]) memory[fd] = 1; else if (copyfd(redir->ndup.dupfd, fd, (flags & REDIR_KEEP) == 0) < 0) error("Redirect (from %d to %d) failed: %s", redir->ndup.dupfd, fd, strerror(errno)); VTRACE(DBG_REDIR, ("openredirect: %d%c&%d\n", fd, "<>"[redir->nfile.type==NTOFD], redir->ndup.dupfd)); } else { (void) close(fd); VTRACE(DBG_REDIR, ("openredirect: %d%c&-\n", fd, "<>"[redir->nfile.type==NTOFD])); } INTON; return; case NHERE: case NXHERE: VTRACE(DBG_REDIR, ("openredirect: %d<<...", fd)); f = openhere(redir); break; default: abort(); } cloexec = fd > 2 && (flags & REDIR_KEEP) == 0 && !posix; if (f != fd) { VTRACE(DBG_REDIR, (" -> %d", fd)); if (copyfd(f, fd, cloexec) < 0) { int e = errno; close(f); error("redirect reassignment (fd %d) failed: %s", fd, strerror(e)); } close(f); } else if (cloexec) (void)fcntl(f, F_SETFD, FD_CLOEXEC); VTRACE(DBG_REDIR, ("%s\n", cloexec ? " cloexec" : "")); INTON; return; ecreate: exerrno = 1; error("cannot create %s: %s", fname, errmsg(errno, E_CREAT)); eopen: exerrno = 1; error("cannot open %s: %s", fname, errmsg(errno, E_OPEN)); } /* * Handle here documents. Normally we fork off a process to write the * data to a pipe. If the document is short, we can stuff the data in * the pipe without forking. */ STATIC int openhere(const union node *redir) { int pip[2]; int len = 0; if (pipe(pip) < 0) error("Pipe call failed"); if (redir->type == NHERE) { len = strlen(redir->nhere.doc->narg.text); if (len <= PIPESIZE) { xwrite(pip[1], redir->nhere.doc->narg.text, len); goto out; } } VTRACE(DBG_REDIR, (" forking [%d,%d]\n", pip[0], pip[1])); if (forkshell(NULL, NULL, FORK_NOJOB) == 0) { close(pip[0]); signal(SIGINT, SIG_IGN); signal(SIGQUIT, SIG_IGN); signal(SIGHUP, SIG_IGN); #ifdef SIGTSTP signal(SIGTSTP, SIG_IGN); #endif signal(SIGPIPE, SIG_DFL); if (redir->type == NHERE) xwrite(pip[1], redir->nhere.doc->narg.text, len); else expandhere(redir->nhere.doc, pip[1]); VTRACE(DBG_PROCS|DBG_REDIR, ("wrote here doc. exiting\n")); _exit(0); } VTRACE(DBG_REDIR, ("openhere (closing %d)", pip[1])); out: close(pip[1]); VTRACE(DBG_REDIR, (" (pipe fd=%d)", pip[0])); return pip[0]; } /* * Undo the effects of the last redirection. */ void popredir(void) { struct redirtab *rp = redirlist; INTOFF; free_rl(rp, 1); redirlist = rp->next; ckfree(rp); INTON; } /* * Undo all redirections. Called on error or interrupt. */ #ifdef mkinit INCLUDE "redir.h" RESET { while (redirlist) popredir(); } SHELLPROC { clearredir(0); } #endif /* Return true if fd 0 has already been redirected at least once. */ int fd0_redirected_p(void) { return fd0_redirected != 0; } /* * Discard all saved file descriptors. */ void clearredir(int vforked) { struct redirtab *rp; struct renamelist *rl; for (rp = redirlist ; rp ; rp = rp->next) { if (!vforked) free_rl(rp, 0); else for (rl = rp->renamed; rl; rl = rl->next) if (rl->into >= 0) close(rl->into); } } /* * Copy a file descriptor to be == to. * cloexec indicates if we want close-on-exec or not. * Returns -1 if any error occurs. */ STATIC int copyfd(int from, int to, int cloexec) { int newfd; if (cloexec && to > 2) { #ifdef O_CLOEXEC newfd = dup3(from, to, O_CLOEXEC); #else newfd = dup2(from, to); fcntl(newfd, F_SETFD, fcntl(newfd,F_GETFD) | FD_CLOEXEC); #endif } else newfd = dup2(from, to); return newfd; } /* * rename fd from to be fd to (closing from). * close-on-exec is never set on 'to' (unless * from==to and it was set on from) - ie: a no-op * returns to (or errors() if an error occurs). * * This is mostly used for rearranging the * results from pipe(). */ int movefd(int from, int to) { if (from == to) return to; (void) close(to); if (copyfd(from, to, 0) != to) { int e = errno; (void) close(from); error("Unable to make fd %d: %s", to, strerror(e)); } (void) close(from); return to; } STATIC void find_big_fd(void) { int i, fd; static int last_start = 3; /* aim to keep sh fd's under 20 */ if (last_start < 10) last_start++; for (i = (1 << last_start); i >= 10; i >>= 1) { if ((fd = fcntl(0, F_DUPFD, i - 1)) >= 0) { close(fd); break; } } fd = (i / 5) * 4; if (fd < 10) fd = 10; big_sh_fd = fd; } /* * If possible, move file descriptor fd out of the way * of expected user fd values. Returns the new fd * (which may be the input fd if things do not go well.) * Always set close-on-exec on the result, and close * the input fd unless it is to be our result. */ int to_upper_fd(int fd) { int i; VTRACE(DBG_REDIR|DBG_OUTPUT, ("to_upper_fd(%d)", fd)); if (big_sh_fd < 10) find_big_fd(); do { i = fcntl(fd, F_DUPFD_CLOEXEC, big_sh_fd); if (i >= 0) { if (fd != i) close(fd); VTRACE(DBG_REDIR|DBG_OUTPUT, ("-> %d\n", i)); return i; } if (errno != EMFILE && errno != EINVAL) break; find_big_fd(); } while (big_sh_fd > 10); /* * If we wanted to move this fd to some random high number * we certainly do not intend to pass it through exec, even * if the reassignment failed. */ (void)fcntl(fd, F_SETFD, FD_CLOEXEC); VTRACE(DBG_REDIR|DBG_OUTPUT, (" fails ->%d\n", fd)); return fd; } void register_sh_fd(int fd, void (*cb)(int, int)) { struct shell_fds *fp; fp = ckmalloc(sizeof (struct shell_fds)); if (fp != NULL) { fp->nxt = sh_fd_list; sh_fd_list = fp; fp->fd = fd; fp->cb = cb; } } void sh_close(int fd) { struct shell_fds **fpp, *fp; fpp = &sh_fd_list; while ((fp = *fpp) != NULL) { if (fp->fd == fd) { *fpp = fp->nxt; ckfree(fp); break; } fpp = &fp->nxt; } (void)close(fd); } STATIC struct shell_fds * sh_fd(int fd) { struct shell_fds *fp; for (fp = sh_fd_list; fp != NULL; fp = fp->nxt) if (fp->fd == fd) return fp; return NULL; } STATIC void renumber_sh_fd(struct shell_fds *fp) { int to; if (fp == NULL) return; /* * if we have had a collision, and the sh fd was a "big" one * try moving the sh fd base to a higher number (if possible) * so future sh fds are less likely to be in the user's sights * (incl this one when moved) */ if (fp->fd >= big_sh_fd) find_big_fd(); to = fcntl(fp->fd, F_DUPFD_CLOEXEC, big_sh_fd); if (to == -1) to = fcntl(fp->fd, F_DUPFD_CLOEXEC, big_sh_fd/2); if (to == -1) to = fcntl(fp->fd, F_DUPFD_CLOEXEC, fp->fd + 1); if (to == -1) to = fcntl(fp->fd, F_DUPFD_CLOEXEC, 10); if (to == -1) to = fcntl(fp->fd, F_DUPFD_CLOEXEC, 3); if (to == -1) error("insufficient file descriptors available"); CLOEXEC(to); if (fp->fd == to) /* impossible? */ return; (*fp->cb)(fp->fd, to); (void)close(fp->fd); fp->fd = to; } static const struct flgnames { const char *name; uint16_t minch; uint32_t value; } nv[] = { #ifdef O_APPEND { "append", 2, O_APPEND }, #else # define O_APPEND 0 #endif #ifdef O_ASYNC { "async", 2, O_ASYNC }, #else # define O_ASYNC 0 #endif #ifdef O_SYNC { "sync", 2, O_SYNC }, #else # define O_SYNC 0 #endif #ifdef O_NONBLOCK { "nonblock", 3, O_NONBLOCK }, #else # define O_NONBLOCK 0 #endif #ifdef O_FSYNC { "fsync", 2, O_FSYNC }, #else # define O_FSYNC 0 #endif #ifdef O_DSYNC { "dsync", 2, O_DSYNC }, #else # define O_DSYNC 0 #endif #ifdef O_RSYNC { "rsync", 2, O_RSYNC }, #else # define O_RSYNC 0 #endif #ifdef O_ALT_IO { "altio", 2, O_ALT_IO }, #else # define O_ALT_IO 0 #endif #ifdef O_DIRECT { "direct", 2, O_DIRECT }, #else # define O_DIRECT 0 #endif #ifdef O_NOSIGPIPE { "nosigpipe", 3, O_NOSIGPIPE }, #else # define O_NOSIGPIPE 0 #endif #define ALLFLAGS (O_APPEND|O_ASYNC|O_SYNC|O_NONBLOCK|O_DSYNC|O_RSYNC|\ O_ALT_IO|O_DIRECT|O_NOSIGPIPE) #ifndef O_CLOEXEC # define O_CLOEXEC ((~ALLFLAGS) ^ ((~ALLFLAGS) & ((~ALLFLAGS) - 1))) #endif /* for any system we support, close on exec is always defined */ { "cloexec", 2, O_CLOEXEC }, { 0, 0, 0 } }; #ifndef O_ACCMODE # define O_ACCMODE 0 #endif #ifndef O_RDONLY # define O_RDONLY 0 #endif #ifndef O_WRONLY # define O_WRONLY 0 #endif #ifndef O_RWDR # define O_RWDR 0 #endif #ifndef O_SHLOCK # define O_SHLOCK 0 #endif #ifndef O_EXLOCK # define O_EXLOCK 0 #endif #ifndef O_NOFOLLOW # define O_NOFOLLOW 0 #endif #ifndef O_CREAT # define O_CREAT 0 #endif #ifndef O_TRUNC # define O_TRUNC 0 #endif #ifndef O_EXCL # define O_EXCL 0 #endif #ifndef O_NOCTTY # define O_NOCTTY 0 #endif #ifndef O_DIRECTORY # define O_DIRECTORY 0 #endif #ifndef O_REGULAR # define O_REGULAR 0 #endif /* * flags that F_GETFL might return that we want to ignore * * F_GETFL should not actually return these, they're all just open() * modifiers, rather than state, but just in case... */ #define IGNFLAGS (O_ACCMODE|O_RDONLY|O_WRONLY|O_RDWR|O_SHLOCK|O_EXLOCK| \ O_NOFOLLOW|O_CREAT|O_TRUNC|O_EXCL|O_NOCTTY|O_DIRECTORY|O_REGULAR) static int getflags(int fd, int p) { int c, f; if (sh_fd(fd) != NULL) { if (!p) return -1; error("Can't get status for fd=%d (%s)", fd, "Bad file descriptor"); /*XXX*/ } if ((c = fcntl(fd, F_GETFD)) == -1) { if (!p) return -1; error("Can't get status for fd=%d (%s)", fd, strerror(errno)); } if ((f = fcntl(fd, F_GETFL)) == -1) { if (!p) return -1; error("Can't get flags for fd=%d (%s)", fd, strerror(errno)); } f &= ~IGNFLAGS; /* clear anything we know about, but ignore */ if (c & FD_CLOEXEC) f |= O_CLOEXEC; return f; } static void printone(int fd, int p, int verbose, int pfd) { int f = getflags(fd, p); const struct flgnames *fn; if (f == -1) return; if (pfd) outfmt(out1, "%d: ", fd); for (fn = nv; fn->name; fn++) { if (f & fn->value) { outfmt(out1, "%s%s", verbose ? "+" : "", fn->name); f &= ~fn->value; } else if (verbose) outfmt(out1, "-%s", fn->name); else continue; if (f || (verbose && fn[1].name)) outfmt(out1, ","); } if (verbose && f) /* f should be normally be 0 */ outfmt(out1, " +%#x", f); outfmt(out1, "\n"); } static void parseflags(char *s, int *p, int *n) { int *v, *w; const struct flgnames *fn; size_t len; *p = 0; *n = 0; for (s = strtok(s, ","); s; s = strtok(NULL, ",")) { switch (*s++) { case '+': v = p; w = n; break; case '-': v = n; w = p; break; default: error("Missing +/- indicator before flag %s", s-1); } len = strlen(s); for (fn = nv; fn->name; fn++) if (len >= fn->minch && strncmp(s,fn->name,len) == 0) { *v |= fn->value; *w &=~ fn->value; break; } if (fn->name == 0) error("Bad flag `%s'", s); } } static void setone(int fd, int pos, int neg, int verbose) { int f = getflags(fd, 1); int n, cloexec; if (f == -1) return; cloexec = -1; if ((pos & O_CLOEXEC) && !(f & O_CLOEXEC)) cloexec = FD_CLOEXEC; if ((neg & O_CLOEXEC) && (f & O_CLOEXEC)) cloexec = 0; if (cloexec != -1 && fcntl(fd, F_SETFD, cloexec) == -1) error("Can't set status for fd=%d (%s)", fd, strerror(errno)); pos &= ~O_CLOEXEC; neg &= ~O_CLOEXEC; f &= ~O_CLOEXEC; n = f; n |= pos; n &= ~neg; if (n != f && fcntl(fd, F_SETFL, n) == -1) error("Can't set flags for fd=%d (%s)", fd, strerror(errno)); if (verbose) printone(fd, 1, verbose, 1); } int fdflagscmd(int argc, char *argv[]) { char *num; int verbose = 0, ch, pos = 0, neg = 0; char *setflags = NULL; optreset = 1; optind = 1; /* initialize getopt */ while ((ch = getopt(argc, argv, ":vs:")) != -1) switch ((char)ch) { case 'v': verbose = 1; break; case 's': if (setflags) goto msg; setflags = optarg; break; case '?': default: msg: error("Usage: fdflags [-v] [-s fd] [fd...]"); /* NOTREACHED */ } argc -= optind, argv += optind; if (setflags) parseflags(setflags, &pos, &neg); if (argc == 0) { int i; if (setflags) goto msg; for (i = 0; i <= max_user_fd; i++) printone(i, 0, verbose, 1); return 0; } while ((num = *argv++) != NULL) { int fd = number(num); while (num[0] == '0' && num[1] != '\0') /* skip 0's */ num++; if (strlen(num) > 5) error("%s too big to be a file descriptor", num); if (setflags) setone(fd, pos, neg, verbose); else printone(fd, 1, verbose, argc > 1); } return 0; } #undef MAX /* in case we inherited them from somewhere */ #undef MIN #define MIN(a,b) (/*CONSTCOND*/((a)<=(b)) ? (a) : (b)) #define MAX(a,b) (/*CONSTCOND*/((a)>=(b)) ? (a) : (b)) /* now make the compiler work for us... */ #define MIN_REDIR MIN(MIN(MIN(MIN(NTO,NFROM), MIN(NTOFD,NFROMFD)), \ MIN(MIN(NCLOBBER,NAPPEND), MIN(NHERE,NXHERE))), NFROMTO) #define MAX_REDIR MAX(MAX(MAX(MAX(NTO,NFROM), MAX(NTOFD,NFROMFD)), \ MAX(MAX(NCLOBBER,NAPPEND), MAX(NHERE,NXHERE))), NFROMTO) static const char *redir_sym[MAX_REDIR - MIN_REDIR + 1] = { [NTO - MIN_REDIR]= ">", [NFROM - MIN_REDIR]= "<", [NTOFD - MIN_REDIR]= ">&", [NFROMFD - MIN_REDIR]= "<&", [NCLOBBER - MIN_REDIR]= ">|", [NAPPEND - MIN_REDIR]= ">>", [NHERE - MIN_REDIR]= "<<", [NXHERE - MIN_REDIR]= "<<", [NFROMTO - MIN_REDIR]= "<>", }; int outredir(struct output *out, union node *n, int sep) { if (n == NULL) return 0; if (n->type < MIN_REDIR || n->type > MAX_REDIR || redir_sym[n->type - MIN_REDIR] == NULL) return 0; if (sep) outc(sep, out); /* * ugly, but all redir node types have "fd" in same slot... * (and code other places assumes it as well) */ if ((redir_sym[n->type - MIN_REDIR][0] == '<' && n->nfile.fd != 0) || (redir_sym[n->type - MIN_REDIR][0] == '>' && n->nfile.fd != 1)) outfmt(out, "%d", n->nfile.fd); outstr(redir_sym[n->type - MIN_REDIR], out); switch (n->type) { case NHERE: outstr("'...'", out); break; case NXHERE: outstr("...", out); break; case NTOFD: case NFROMFD: if (n->ndup.dupfd < 0) outc('-', out); else outfmt(out, "%d", n->ndup.dupfd); break; default: outstr(n->nfile.expfname, out); break; } return 1; }