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diff --git a/bin/sh/miscbltin.c b/bin/sh/miscbltin.c
--- a/bin/sh/miscbltin.c
+++ b/bin/sh/miscbltin.c
@@ -40,11 +40,14 @@
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
-#include <unistd.h>
+
#include <errno.h>
+#include <poll.h>
+#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
+#include <unistd.h>
#include "shell.h"
#include "options.h"
@@ -162,17 +165,18 @@
int is_ifs;
int saveall = 0;
ptrdiff_t lastnonifs, lastnonifsws;
- struct timeval tv;
- char *tvptr;
- fd_set ifds;
+ sigset_t set, oset;
+ intmax_t number, timeout;
+ struct timespec tnow, tend, tresid;
+ struct pollfd pfd;
+ char *endptr;
ssize_t nread;
int sig;
struct fdctx fdctx;
rflag = 0;
prompt = NULL;
- tv.tv_sec = -1;
- tv.tv_usec = 0;
+ timeout = -1;
while ((i = nextopt("erp:t:")) != '\0') {
switch(i) {
case 'p':
@@ -184,22 +188,29 @@
rflag = 1;
break;
case 't':
- tv.tv_sec = strtol(shoptarg, &tvptr, 0);
- if (tvptr == shoptarg)
- error("timeout value");
- switch(*tvptr) {
- case 0:
- case 's':
- break;
- case 'h':
- tv.tv_sec *= 60;
- /* FALLTHROUGH */
- case 'm':
- tv.tv_sec *= 60;
- break;
- default:
- error("timeout unit");
- }
+ timeout = 0;
+ do {
+ number = strtol(shoptarg, &endptr, 0);
+ if (number < 0 || endptr == shoptarg)
+ error("timeout value");
+ switch (*endptr) {
+ case 's':
+ endptr++;
+ break;
+ case 'h':
+ number *= 60;
+ /* FALLTHROUGH */
+ case 'm':
+ number *= 60;
+ endptr++;
+ break;
+ }
+ if (*endptr != '\0' &&
+ !(*endptr >= '0' && *endptr <= '9'))
+ error("timeout unit");
+ timeout += number;
+ shoptarg = endptr;
+ } while (*shoptarg != '\0');
break;
}
}
@@ -212,13 +223,33 @@
if ((ifs = bltinlookup("IFS", 1)) == NULL)
ifs = " \t\n";
- if (tv.tv_sec >= 0) {
+ if (timeout >= 0) {
/*
* Wait for something to become available.
*/
- FD_ZERO(&ifds);
- FD_SET(0, &ifds);
- status = select(1, &ifds, NULL, NULL, &tv);
+ pfd.fd = STDIN_FILENO;
+ pfd.events = POLLIN;
+ status = sig = 0;
+ sigfillset(&set);
+ sigprocmask(SIG_SETMASK, &set, &oset);
+ if (pendingsig) {
+ /* caught a signal already */
+ status = -1;
+ } else if (timeout == 0) {
+ status = poll(&pfd, 1, 0);
+ } else {
+ clock_gettime(CLOCK_UPTIME, &tnow);
+ tend = tnow;
+ tend.tv_sec += timeout;
+ do {
+ timespecsub(&tend, &tnow, &tresid);
+ status = ppoll(&pfd, 1, &tresid, &oset);
+ if (status >= 0 || pendingsig != 0)
+ break;
+ clock_gettime(CLOCK_UPTIME, &tnow);
+ } while (timespeccmp(&tnow, &tend, <));
+ }
+ sigprocmask(SIG_SETMASK, &oset, NULL);
/*
* If there's nothing ready, return an error.
*/
diff --git a/bin/sh/sh.1 b/bin/sh/sh.1
--- a/bin/sh/sh.1
+++ b/bin/sh/sh.1
@@ -31,7 +31,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd May 1, 2025
+.Dd November 17, 2025
.Dt SH 1
.Os
.Sh NAME
@@ -2544,6 +2544,10 @@
If none is supplied,
.Ql s
is assumed.
+Multiple value-unit groups may be stringed together, in which case
+they are added up, e.g.\&
+.Ql 1h30m15s
+which adds up to 5,415 seconds.
.Pp
The
.Fl e
diff --git a/bin/sh/tests/builtins/Makefile b/bin/sh/tests/builtins/Makefile
--- a/bin/sh/tests/builtins/Makefile
+++ b/bin/sh/tests/builtins/Makefile
@@ -143,6 +143,7 @@
${PACKAGE}FILES+= read9.0
${PACKAGE}FILES+= read10.0
${PACKAGE}FILES+= read11.0
+${PACKAGE}FILES+= read12.0
${PACKAGE}FILES+= return1.0
${PACKAGE}FILES+= return2.1
${PACKAGE}FILES+= return3.1
diff --git a/bin/sh/tests/builtins/read11.0 b/bin/sh/tests/builtins/read11.0
--- a/bin/sh/tests/builtins/read11.0
+++ b/bin/sh/tests/builtins/read11.0
@@ -1,3 +1,5 @@
+# Verify that `read -t 0 v` succeeds immediately if input is available
+# and fails immediately if not
set -e
@@ -6,12 +8,25 @@
cd $T
mkfifo fifo1
# Open fifo1 for writing
-{ sleep 10; } >fifo1 &
+{ echo new_value; sleep 10; } >fifo1 &
# Wait for the child to open fifo1 for writing
exec 3<fifo1
+
+v=original_value
+r=0
+ts=$(date +%s%3N)
+read -t 0 v <&3 || r=$?
+te=$(date +%s%3N)
+[ "$r" -eq 0 ]
+[ $((te-ts)) -lt 250 ]
+[ "$v" = "new_value" ]
+
v=original_value
r=0
+ts=$(date +%s%3N)
read -t 0 v <&3 || r=$?
+te=$(date +%s%3N)
kill -TERM "$!" || :
-{ [ "$r" -gt 128 ] && [ "$(kill -l "$r")" = ALRM ]; } || exit
+[ "$r" -gt 128 ] && [ "$(kill -l "$r")" = ALRM ]
+[ $((te-ts)) -lt 250 ]
[ -z "$v" ]
diff --git a/bin/sh/tests/builtins/read12.0 b/bin/sh/tests/builtins/read12.0
new file mode 100644
--- /dev/null
+++ b/bin/sh/tests/builtins/read12.0
@@ -0,0 +1,32 @@
+# Verify that `read -t 3 v` succeeds immediately if input is available
+# and times out after 3 s if not
+
+set -e
+
+T=$(mktemp -d ${TMPDIR:-/tmp}/sh-test.XXXXXX)
+trap 'rm -rf "$T"' 0
+cd $T
+mkfifo fifo1
+# Open fifo1 for writing
+{ echo new_value; sleep 10; } >fifo1 &
+# Wait for the child to open fifo1 for writing
+exec 3<fifo1
+
+v=original_value
+r=0
+ts=$(date +%s%3N)
+read -t 3 v <&3 || r=$?
+te=$(date +%s%3N)
+[ "$r" -eq 0 ]
+[ $((te-ts)) -lt 250 ]
+[ "$v" = "new_value" ]
+
+v=original_value
+r=0
+ts=$(date +%s%3N)
+read -t 3 v <&3 || r=$?
+te=$(date +%s%3N)
+kill -TERM "$!" || :
+[ "$r" -gt 128 ] && [ "$(kill -l "$r")" = ALRM ]
+[ $((te-ts)) -gt 3000 ] && [ $((te-ts)) -lt 3250 ]
+[ -z "$v" ]

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