diff options
Diffstat (limited to 'src/redir.c')
| -rw-r--r-- | src/redir.c | 46 |
1 files changed, 37 insertions, 9 deletions
diff --git a/src/redir.c b/src/redir.c index 6ffde0c..d4d9c39 100644 --- a/src/redir.c +++ b/src/redir.c @@ -57,7 +57,10 @@ #include "error.h" +#define REALLY_CLOSED -3 /* fd that was closed and still is */ #define EMPTY -2 /* marks an unused slot in redirtab */ +#define CLOSED -1 /* fd opened for redir needs to be closed */ + #ifndef PIPE_BUF # define PIPESIZE 4096 /* amount of buffering in a pipe */ #else @@ -135,14 +138,29 @@ redirect(union node *redir, int flags) continue; /* redirect from/to same file descriptor */ newfd = openredirect(n); + + if (sv) { + p = &sv->renamed[fd]; + i = *p; + + if (likely(i == EMPTY)) { + i = CLOSED; + if (fd != newfd) { + i = savefd(fd); + fd = -1; + } + } + + if (i == newfd) + /* Can only happen if i == newfd == CLOSED */ + i = REALLY_CLOSED; + + *p = i; + } + if (fd == newfd) continue; - if (sv && *(p = &sv->renamed[fd]) == EMPTY) { - int i = savefd(fd); - if (i >= 0) - *p = i; - } #ifdef notyet dupredirect(n, newfd, memory); #else @@ -204,7 +222,7 @@ openredirect(union node *redir) /* Fall through to eliminate warning. */ case NTOFD: case NFROMFD: - f = -1; + f = redir->ndup.dupfd; break; case NHERE: case NXHERE: @@ -239,9 +257,10 @@ dupredirect(redir, f) memory[fd] = 0; #endif if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) { - if (redir->ndup.dupfd >= 0) { /* if not ">&-" */ + /* if not ">&-" */ + if (f >= 0) { #ifdef notyet - if (memory[redir->ndup.dupfd]) + if (memory[f]) memory[fd] = 1; else #endif @@ -324,10 +343,19 @@ popredir(int drop) INTOFF; rp = redirlist; for (i = 0 ; i < 10 ; i++) { - if (rp->renamed[i] != EMPTY) { + switch (rp->renamed[i]) { + case CLOSED: + if (!drop) + close(i); + break; + case EMPTY: + case REALLY_CLOSED: + break; + default: if (!drop) dup2(rp->renamed[i], i); close(rp->renamed[i]); + break; } } redirlist = rp->next; |