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/* Copyright (c) 2017 Apple Inc. All rights reserved. */
#include <stdio.h>
#include <dispatch/dispatch.h>
#include <sysexits.h>
#include <inttypes.h>
#include <string.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <mach/mach_time.h>
#include <sys/stackshot.h>
#include <sys/types.h>
#include <kern/debug.h>
#include <unistd.h>
#include <assert.h>
#include <kern/kcdata.h>
#include <libiosexec.h>
static uint64_t
stackshot_get_mach_absolute_time(void *buffer, uint32_t size)
{
kcdata_iter_t iter = kcdata_iter_find_type(kcdata_iter(buffer, size), KCDATA_TYPE_MACH_ABSOLUTE_TIME);
if (!kcdata_iter_valid(iter) || kcdata_iter_size(iter) < sizeof(uint64_t)) {
fprintf(stderr, "bad kcdata\n");
exit(1);
}
return *(uint64_t *)kcdata_iter_payload(iter);
}
__dead2 static void usage(char **argv)
{
fprintf (stderr, "usage: %s [options] [file]\n", argv[0]);
fprintf (stderr, " -d : take delta stackshot\n");
fprintf (stderr, " -b : get bootprofile\n");
fprintf (stderr, " -c : get coalition data\n");
fprintf (stderr, " -i : get instructions and cycles\n");
fprintf (stderr, " -g : get thread group data\n");
fprintf (stderr, " -s : fork a sleep process\n");
fprintf (stderr, " -L : disable loadinfo\n");
fprintf (stderr, " -k : active kernel threads only\n");
fprintf (stderr, " -I : disable io statistics\n");
fprintf (stderr, " -S : stress test: while(1) stackshot; \n");
fprintf (stderr, " -p PID : target a pid\n");
fprintf (stderr, " -E : grab existing kernel buffer\n");
fprintf (stderr, "If no file is provided and stdout is not a TTY, the stackshot will be written to stdout.\n");
exit(1);
}
static void forksleep() {
pid_t pid = fork();
if (pid < 0) {
perror("fork");
exit(1);
}
if (pid == 0) {
execlp("sleep", "sleep", "30", NULL);
perror("execlp");
exit(1);
}
}
int main(int argc, char **argv) {
uint32_t iostats = 0;
uint32_t active_kernel_threads_only = 0;
uint32_t bootprofile = 0;
uint32_t thread_group = 0;
uint32_t coalition = 0;
uint32_t instrs_cycles = 0;
uint32_t flags = 0;
uint32_t loadinfo = STACKSHOT_SAVE_LOADINFO | STACKSHOT_SAVE_KEXT_LOADINFO;
boolean_t delta = FALSE;
boolean_t sleep = FALSE;
boolean_t stress = FALSE;
pid_t pid = -1;
int c;
FILE *file;
bool closefile;
while ((c = getopt(argc, argv, "SgIikbcLdtsp:E")) != -1) {
switch(c) {
case 'I':
iostats |= STACKSHOT_NO_IO_STATS;
break;
case 'k':
active_kernel_threads_only |= STACKSHOT_ACTIVE_KERNEL_THREADS_ONLY;
loadinfo &= ~STACKSHOT_SAVE_LOADINFO;
break;
case 'b':
bootprofile |= STACKSHOT_GET_BOOT_PROFILE;
break;
case 'c':
coalition |= STACKSHOT_SAVE_JETSAM_COALITIONS;
break;
case 'i':
instrs_cycles |= STACKSHOT_INSTRS_CYCLES;
break;
case 'L':
loadinfo = 0;
break;
case 'g':
thread_group |= STACKSHOT_THREAD_GROUP;
break;
case 'd':
delta = TRUE;
break;
case 's':
sleep = TRUE;
break;
case 'p':
pid = atoi(optarg);
break;
case 'S':
stress = TRUE;
break;
case 'E':
flags = flags | STACKSHOT_RETRIEVE_EXISTING_BUFFER;
break;
case '?':
case 'h':
default:
usage(argv);
break;
}
}
if (thread_group && delta) {
fprintf(stderr, "stackshot does not support delta snapshots with thread groups\n");
return 1;
}
if (optind == argc - 1) {
const char *const filename = argv[optind];
file = fopen(filename, "wx");
closefile = true;
if (file == NULL) {
perror("fopen");
return EX_CANTCREAT;
}
} else if (optind == argc && !isatty(STDOUT_FILENO)) {
file = stdout;
closefile = false;
} else {
usage(argv);
}
top:
;
void * config = stackshot_config_create();
if (!config) {
perror("stackshot_config_create");
return 1;
}
flags = flags | loadinfo | STACKSHOT_SAVE_IMP_DONATION_PIDS | STACKSHOT_GET_DQ | STACKSHOT_KCDATA_FORMAT | STACKSHOT_THREAD_WAITINFO |
bootprofile | active_kernel_threads_only | iostats | thread_group | coalition | instrs_cycles;
int err = stackshot_config_set_flags(config, flags);
if (err != 0) {
perror("stackshot_config_set_flags");
return 1;
}
if (pid != -1) {
int err = stackshot_config_set_pid(config, pid);
if (err != 0) {
perror("stackshot_config_set_flags");
return 1;
}
}
err = stackshot_capture_with_config(config);
if (err != 0) {
perror("stackshot_capture_with_config");
return 1;
}
void *buf = stackshot_config_get_stackshot_buffer(config);
if (!buf) {
perror("stackshot_config_get_stackshot_buffer");
return 1;
}
uint32_t size = stackshot_config_get_stackshot_size(config);
if (delta) {
// output the original somewhere?
uint64_t time = stackshot_get_mach_absolute_time(buf, size);
err = stackshot_config_dealloc_buffer(config);
assert(!err);
flags |= STACKSHOT_COLLECT_DELTA_SNAPSHOT;
int err = stackshot_config_set_flags(config, flags);
if (err != 0) {
perror("stackshot_config_set_flags");
return 1;
}
err = stackshot_config_set_delta_timestamp(config, time);
if (err != 0) {
perror("stackshot_config_delta_timestamp");
return 1;
}
if (sleep) {
forksleep();
}
usleep(10000);
err = stackshot_capture_with_config(config);
if (err != 0) {
perror("stackshot_capture_with_config");
return 1;
}
buf = stackshot_config_get_stackshot_buffer(config);
if (!buf) {
perror("stackshot_config_get_stackshot_buffer");
return 1;
}
size = stackshot_config_get_stackshot_size(config);
}
if (stress) {
if (config) {
stackshot_config_dealloc(config);
config = NULL;
}
goto top;
}
fwrite(buf, size, 1, file);
if (closefile) {
fclose(file);
}
return 0;
}
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