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InitSystem (Linux): add fast path for systemd version detection

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This commit is contained in:
Carter Li
2024-08-08 15:04:01 +08:00
parent a9373fb4e4
commit 3fae29ba8f
1 changed files with 29 additions and 10 deletions
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src/detection/initsystem/initsystem_linux.c
+29 -10
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@@ -1,7 +1,22 @@
#include "initsystem.h"
#include "common/processing.h"
#include "util/linux/elf.h"
#include <unistd.h>
static bool elfExtractStringsCallBack(const char* str, uint32_t len, void* data)
{
if (len > strlen("systemd 0.0 running in ") && memcmp(str, "systemd ", strlen("systemd ")) == 0)
{
const char* pend = memmem(str + strlen("systemd "), len - strlen("systemd "), " running in ", strlen(" running in "));
if (pend)
{
ffStrbufSetNS((FFstrbuf*) data, (uint32_t) (pend - str) - (uint32_t) strlen("systemd "), str + strlen("systemd "));
return false;
}
}
return true;
}
const char* ffDetectInitSystem(FFInitSystemResult* result)
{
const char* error = ffProcessGetBasicInfoLinux((int) result->pid, &result->name, NULL, NULL);
@@ -33,18 +48,22 @@ const char* ffDetectInitSystem(FFInitSystemResult* result)
{
if (ffStrbufEqualS(&result->name, "systemd"))
{
if (ffProcessAppendStdOut(&result->version, (char* const[]) {
ffStrbufEndsWithS(&result->exe, "/systemd") ? result->exe.chars : "systemctl", // use exe path in case users have another systemd installed
"--version",
NULL,
}) == NULL && result->version.length)
ffElfExtractStrings(result->exe.chars, elfExtractStringsCallBack, &result->version);
if (result->version.length == 0)
{
uint32_t iStart = ffStrbufFirstIndexC(&result->version, '(');
if (iStart < result->version.length)
if (ffProcessAppendStdOut(&result->version, (char* const[]) {
ffStrbufEndsWithS(&result->exe, "/systemd") ? result->exe.chars : "systemctl", // use exe path in case users have another systemd installed
"--version",
NULL,
}) == NULL && result->version.length)
{
uint32_t iEnd = ffStrbufNextIndexC(&result->version, iStart + 1, ')');
ffStrbufSubstrBefore(&result->version, iEnd);
ffStrbufSubstrAfter(&result->version, iStart);
uint32_t iStart = ffStrbufFirstIndexC(&result->version, '(');
if (iStart < result->version.length)
{
uint32_t iEnd = ffStrbufNextIndexC(&result->version, iStart + 1, ')');
ffStrbufSubstrBefore(&result->version, iEnd);
ffStrbufSubstrAfter(&result->version, iStart);
}
}
}
}