STATIC int
openredirect(union node *redir)
{
char *fname;
int f;
switch (redir->nfile.type) {
case NFROM:
fname = redir->nfile.expfname;
if ((f = open64(fname, O_RDONLY)) < 0)
goto eopen;
break;
case NFROMTO:
fname = redir->nfile.expfname;
if ((f = open64(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
goto ecreate;
break;
case NTO:
/* Take care of noclobber mode. */
if (Cflag) {
fname = redir->nfile.expfname;
if ((f = noclobberopen(fname)) < 0)
goto ecreate;
break;
}
/* FALLTHROUGH */
case NCLOBBER:
fname = redir->nfile.expfname;
if ((f = open64(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
goto ecreate;
break;
case NAPPEND:
fname = redir->nfile.expfname;
if ((f = open64(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
goto ecreate;
break;
default:
#ifdef DEBUG
abort();
#endif
/* Fall through to eliminate warning. */
case NTOFD:
case NFROMFD:
f = -1;
break;
case NHERE:
case NXHERE:
f = openhere(redir);
break;
}
return f;
ecreate:
sh_error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
eopen:
sh_error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
}
static void
openredirect(union node *redir, char memory[10])
{
struct stat sb;
int fd = redir->nfile.fd;
const char *fname;
int f;
int e;
memory[fd] = 0;
switch (redir->nfile.type) {
case NFROM:
fname = redir->nfile.expfname;
if ((f = open(fname, O_RDONLY)) < 0)
error("cannot open %s: %s", fname, strerror(errno));
break;
case NFROMTO:
fname = redir->nfile.expfname;
if ((f = open(fname, O_RDWR|O_CREAT, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
break;
case NTO:
if (Cflag) {
fname = redir->nfile.expfname;
if (stat(fname, &sb) == -1) {
if ((f = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
} else if (!S_ISREG(sb.st_mode)) {
if ((f = open(fname, O_WRONLY, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
if (fstat(f, &sb) != -1 && S_ISREG(sb.st_mode)) {
close(f);
error("cannot create %s: %s", fname,
strerror(EEXIST));
}
} else
error("cannot create %s: %s", fname,
strerror(EEXIST));
break;
}
/* FALLTHROUGH */
case NCLOBBER:
fname = redir->nfile.expfname;
if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
break;
case NAPPEND:
fname = redir->nfile.expfname;
if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
break;
case NTOFD:
case NFROMFD:
if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
if (memory[redir->ndup.dupfd])
memory[fd] = 1;
else {
if (dup2(redir->ndup.dupfd, fd) < 0)
error("%d: %s", redir->ndup.dupfd,
strerror(errno));
}
} else {
close(fd);
}
return;
case NHERE:
case NXHERE:
f = openhere(redir);
break;
default:
abort();
}
if (f != fd) {
if (dup2(f, fd) == -1) {
e = errno;
close(f);
error("%d: %s", fd, strerror(e));
}
close(f);
}
}
static void
openredirect(union node *redir, char memory[10])
{
struct stat sb;
int fd = redir->nfile.fd;
char *fname;
int f;
int e;
/*
* We suppress interrupts so that we won't leave open file
* descriptors around. Because the signal handler remains
* installed and we do not use system call restart, interrupts
* will still abort blocking opens such as fifos (they will fail
* with EINTR). There is, however, a race condition if an interrupt
* arrives after INTOFF and before open blocks.
*/
INTOFF;
memory[fd] = 0;
switch (redir->nfile.type) {
case NFROM:
fname = redir->nfile.expfname;
if ((f = open(fname, O_RDONLY)) < 0)
error("cannot open %s: %s", fname, strerror(errno));
movefd:
if (f != fd) {
if (dup2(f, fd) == -1) {
e = errno;
close(f);
error("%d: %s", fd, strerror(e));
}
close(f);
}
break;
case NFROMTO:
fname = redir->nfile.expfname;
if ((f = open(fname, O_RDWR|O_CREAT, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
goto movefd;
case NTO:
if (Cflag) {
fname = redir->nfile.expfname;
if (stat(fname, &sb) == -1) {
if ((f = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
} else if (!S_ISREG(sb.st_mode)) {
if ((f = open(fname, O_WRONLY, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
if (fstat(f, &sb) != -1 && S_ISREG(sb.st_mode)) {
close(f);
error("cannot create %s: %s", fname,
strerror(EEXIST));
}
} else
error("cannot create %s: %s", fname,
strerror(EEXIST));
goto movefd;
}
/* FALLTHROUGH */
case NCLOBBER:
fname = redir->nfile.expfname;
if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
goto movefd;
case NAPPEND:
fname = redir->nfile.expfname;
if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
error("cannot create %s: %s", fname, strerror(errno));
goto movefd;
case NTOFD:
case NFROMFD:
if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
if (memory[redir->ndup.dupfd])
memory[fd] = 1;
else {
if (dup2(redir->ndup.dupfd, fd) < 0)
error("%d: %s", redir->ndup.dupfd,
strerror(errno));
}
} else {
close(fd);
}
break;
case NHERE:
case NXHERE:
f = openhere(redir);
goto movefd;
default:
abort();
}
INTON;
}
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;
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|O_TRUNC, 0666)) < 0)
goto ecreate;
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;
}
break;
}
/* FALLTHROUGH */
case NCLOBBER:
fname = redir->nfile.expfname;
if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
goto ecreate;
break;
case NAPPEND:
fname = redir->nfile.expfname;
if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
goto ecreate;
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));
} else
(void) close(fd);
INTON;
return;
case NHERE:
case NXHERE:
f = openhere(redir);
break;
default:
abort();
}
cloexec = fd > 2 && (flags & REDIR_KEEP) == 0;
if (f != 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);
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));
}
STATIC void
openredirect(union node *redir, char memory[10], int flags)
{
int fd = redir->nfile.fd;
char *fname;
int f;
int oflags = O_WRONLY|O_CREAT|O_TRUNC, eflags;
/*
* 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;
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;
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|O_TRUNC, 0666)) < 0)
goto ecreate;
break;
case NTO:
if (Cflag)
oflags |= O_EXCL;
/* FALLTHROUGH */
case NCLOBBER:
fname = redir->nfile.expfname;
if ((f = open(fname, oflags, 0666)) < 0)
goto ecreate;
break;
case NAPPEND:
fname = redir->nfile.expfname;
if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
goto ecreate;
break;
case NTOFD:
case NFROMFD:
if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
if (memory[redir->ndup.dupfd])
memory[fd] = 1;
else
copyfd(redir->ndup.dupfd, fd, 1);
}
INTON;
return;
case NHERE:
case NXHERE:
f = openhere(redir);
break;
default:
abort();
}
if (f != fd) {
copyfd(f, fd, 1);
close(f);
}
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));
}
