mirror of
https://github.com/git/git.git
synced 2026-03-05 06:57:37 +01:00
fd104ef15d
In353d3d77f4(trace2: collect Windows-specific process information, 2019-02-22) Windows-specific process ancestry information was added as a data_json event to TRACE2. Furthermore in2f732bf15e(tr2: log parent process name, 2021-07-21) similar functionality was added for Linux-based systems, using procfs. Teach Git to also log process ancestry on macOS using the sysctl with KERN_PROC to get process information (PPID and process name). Like the Linux implementation, we use the cmd_ancestry TRACE2 event rather than using a data_json event and creating another custom data point. Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
#include "git-compat-util.h"
|
|
#include "strbuf.h"
|
|
#include "strvec.h"
|
|
#include "trace2.h"
|
|
#include <sys/sysctl.h>
|
|
|
|
/*
|
|
* An arbitrarily chosen value to limit the depth of the ancestor chain.
|
|
*/
|
|
#define NR_PIDS_LIMIT 10
|
|
|
|
/*
|
|
* Get the process name and parent PID for a given PID using sysctl().
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
static int get_proc_info(pid_t pid, struct strbuf *name, pid_t *ppid)
|
|
{
|
|
int mib[4];
|
|
struct kinfo_proc proc;
|
|
size_t size = sizeof(proc);
|
|
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_PROC;
|
|
mib[2] = KERN_PROC_PID;
|
|
mib[3] = pid;
|
|
|
|
if (sysctl(mib, 4, &proc, &size, NULL, 0) < 0)
|
|
return -1;
|
|
|
|
if (size == 0)
|
|
return -1;
|
|
|
|
strbuf_addstr(name, proc.kp_proc.p_comm);
|
|
*ppid = proc.kp_eproc.e_ppid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Recursively push process names onto the ancestry array.
|
|
* We guard against cycles by limiting the depth to NR_PIDS_LIMIT.
|
|
*/
|
|
static void push_ancestry_name(struct strvec *names, pid_t pid, int depth)
|
|
{
|
|
struct strbuf name = STRBUF_INIT;
|
|
pid_t ppid;
|
|
|
|
if (depth >= NR_PIDS_LIMIT)
|
|
return;
|
|
|
|
if (pid <= 0)
|
|
return;
|
|
|
|
if (get_proc_info(pid, &name, &ppid) < 0)
|
|
goto cleanup;
|
|
|
|
strvec_push(names, name.buf);
|
|
|
|
/*
|
|
* Recurse to the parent process. Stop if ppid not valid
|
|
* or if we've reached ourselves (cycle).
|
|
*/
|
|
if (ppid && ppid != pid)
|
|
push_ancestry_name(names, ppid, depth + 1);
|
|
|
|
cleanup:
|
|
strbuf_release(&name);
|
|
}
|
|
|
|
void trace2_collect_process_info(enum trace2_process_info_reason reason)
|
|
{
|
|
struct strvec names = STRVEC_INIT;
|
|
|
|
if (!trace2_is_enabled())
|
|
return;
|
|
|
|
switch (reason) {
|
|
case TRACE2_PROCESS_INFO_STARTUP:
|
|
push_ancestry_name(&names, getppid(), 0);
|
|
if (names.nr)
|
|
trace2_cmd_ancestry(names.v);
|
|
|
|
strvec_clear(&names);
|
|
break;
|
|
|
|
case TRACE2_PROCESS_INFO_EXIT:
|
|
/*
|
|
* The Windows version of this calls its
|
|
* get_peak_memory_info() here. We may want to insert
|
|
* similar process-end statistics here in the future.
|
|
*/
|
|
break;
|
|
|
|
default:
|
|
BUG("trace2_collect_process_info: unknown reason '%d'", reason);
|
|
}
|
|
}
|