- revert r15563 (pull current version of taskset off the busybox_scratch branch)

5 files changed, 125 insertions, 0 deletions

diff --git a/include/applets.h b/include/applets.h
index 80ee222d8..d3e38d813 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -284,6 +284,7 @@ USE_BB_SYSCTL(APPLET(sysctl, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_SYSLOGD(APPLET(syslogd, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_TAIL(APPLET(tail, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TAR(APPLET(tar, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_TASKSET(APPLET(taskset, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TEE(APPLET(tee, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TELNET(APPLET(telnet, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TELNETD(APPLET(telnetd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
diff --git a/include/usage.h b/include/usage.h
index 69e958d68..7ba79ff87 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -3001,6 +3001,23 @@ USE_FEATURE_START_STOP_DAEMON_FANCY( \
         "$ zcat /tmp/tarball.tar.gz | tar -xf -\n" \
         "$ tar -cf /tmp/tarball.tar /usr/local\n"
 
+#define taskset_trivial_usage \
+                "[OPTIONS] [mask] [pid | command [arg]...]"
+#define taskset_full_usage \
+                "Set or get CPU affinity.\n\n" \
+        "Options:\n" \
+        "\t-p\toperate on an existing PID"
+#define taskset_example_usage \
+                "$ taskset 0x7 ./dgemm_test&\n" \
+        "$ taskset -p 0x1 $!\n" \
+        "pid 4790's current affinity mask: 7\n" \
+        "pid 4790's new affinity mask: 1\n" \
+        "$ taskset 0x7 /bin/sh -c './taskset -p 0x1 $$'\n" \
+        "pid 6671's current affinity mask: 1\n" \
+        "pid 6671's new affinity mask: 1\n" \
+        "$ taskset -p 1\n"
+        "pid 1's current affinity mask: 3\n"
+
 #define tee_trivial_usage \
         "[OPTION]... [FILE]..."
 #define tee_full_usage \
diff --git a/miscutils/Config.in b/miscutils/Config.in
index e093924d7..90e2b6fb1 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -340,6 +340,16 @@ config TASKSET
         default n
         help
           Retrieve or set a processes's CPU affinity.
+          This requires sched_{g,s}etaffinity support in your libc.
+
+config FEATURE_TASKSET_FANCY
+        bool "fancy output"
+        default y
+        depends on TASKSET
+        help
+          Add code for fancy output. This merely silences a compiler-warning
+          and adds about 135 Bytes. May be needed for machines with alot
+          of CPUs.
 
 config TIME
         bool "time"
diff --git a/miscutils/Kbuild b/miscutils/Kbuild
index 16c76fa38..8d1b9f484 100644
--- a/miscutils/Kbuild
+++ b/miscutils/Kbuild
@@ -25,5 +25,6 @@ lib-$(CONFIG_RUNLEVEL)    += runlevel.o
 lib-$(CONFIG_RX)          += rx.o
 lib-$(CONFIG_SETSID)      += setsid.o
 lib-$(CONFIG_STRINGS)     += strings.o
+lib-$(CONFIG_TASKSET)     += taskset.o
 lib-$(CONFIG_TIME)        += time.o
 lib-$(CONFIG_WATCHDOG)    += watchdog.o
diff --git a/miscutils/taskset.c b/miscutils/taskset.c
new file mode 100644
index 000000000..4496aa5b4
--- /dev/null
+++ b/miscutils/taskset.c
@@ -0,0 +1,96 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * taskset - retrieve or set a processes' CPU affinity
+ * Copyright (c) 2006 Bernhard Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "busybox.h"
+#include <sched.h>
+#include <unistd.h>
+#include <getopt.h> /* optind */
+
+#if ENABLE_FEATURE_TASKSET_FANCY
+#define TASKSET_PRINTF_MASK "%s"
+#define from_cpuset(x) __from_cpuset(&x)
+/* craft a string from the mask */
+static char *__from_cpuset(cpu_set_t *mask) {
+        int i;
+        char *ret = 0, *str = xzalloc(9);
+
+        for (i = CPU_SETSIZE - 4; i >= 0; i -= 4) {
+                char val = 0;
+                int off;
+                for (off = 0; off <= 3; ++off)
+                        if (CPU_ISSET(i+off, mask))
+                                val |= 1<<off;
+
+                if (!ret && val)
+                        ret = str;
+                *str++ = (val-'0'<=9) ? (val+48) : (val+87);
+        }
+        return ret;
+}
+#else
+#define TASKSET_PRINTF_MASK "%x"
+#define from_cpuset(mask) mask
+#endif
+
+#define TASKSET_OPT_p (1)
+
+int taskset_main(int argc, char** argv)
+{
+        cpu_set_t mask, new_mask;
+        pid_t pid = 0;
+        unsigned long ul;
+        const char *state = "current\0new";
+        char *p_opt = NULL, *aff = NULL;
+
+        ul = getopt32(argc, argv, "+p:", &p_opt);
+
+        if (ul & TASKSET_OPT_p) {
+                if (argc == optind+1) { /* -p <aff> <pid> */
+                        aff = p_opt;
+                        p_opt = argv[optind];
+                }
+                argv += optind; /* me -p <arg> */
+                pid = xatoul_range(p_opt, 1, ULONG_MAX); /* -p <pid> */
+        } else
+                aff = *++argv; /* <aff> <cmd...> */
+        if (aff) {
+                unsigned i = 0;
+                unsigned long l = xstrtol_range(aff, 16, 1, ULONG_MAX);
+
+                CPU_ZERO(&new_mask);
+                while (i < CPU_SETSIZE && l >= (1<<i)) {
+                        if ((1<<i) & l)
+                                CPU_SET(i, &new_mask);
+                        ++i;
+                }
+        }
+
+        if (ul & TASKSET_OPT_p) {
+print_aff:
+                if (sched_getaffinity(pid, sizeof (mask), &mask) < 0)
+                        bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 'g', pid);
+                printf("pid %d's %s affinity mask: "TASKSET_PRINTF_MASK"\n",
+                                pid, state, from_cpuset(mask));
+                if (!*argv) /* no new affinity given or we did print already, done. */
+                        return EXIT_SUCCESS;
+        }
+
+        if (sched_setaffinity(pid, sizeof (new_mask), &new_mask))
+                bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 's', pid);
+        if (ul & TASKSET_OPT_p) {
+                state += 8;
+                ++argv;
+                goto print_aff;
+        }
+        ++argv;
+        execvp(*argv, argv);
+        bb_perror_msg_and_die("%s", *argv);
+}
+#undef TASKSET_OPT_p
+#undef TASKSET_PRINTF_MASK
+#undef from_cpuset