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reimplement GetProgramInvocationName via reading /proc/self/exe

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This enables us to support NetBSD, as it lacks
program_invocation_name, but has fairly full-featured procfs.
This commit is contained in:
Aliaksey Kandratsenka 2023-06-26 18:01:58 -04:00
parent 50b5219635
commit 5b86aa0a51
1 changed files with 34 additions and 2 deletions
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36
src/symbolize.cc
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@ -82,7 +82,39 @@ static char* get_pprof_path() {
// Returns NULL if we're on an OS where we can't get the invocation name.
// Using a static var is ok because we're not called from a thread.
static const char* GetProgramInvocationName() {
#if defined(HAVE_PROGRAM_INVOCATION_NAME)
#if defined(__linux__) || defined(__NetBSD__)
// Those systems have functional procfs. And we can simply readlink
// /proc/self/exe.
static const char* argv0 = ([] () {
int sz = 1024;
char* retval = nullptr;
for (;;) {
if (INT_MAX / 2 <= sz) {
free(retval);
retval = nullptr;
break;
}
sz *= 2;
retval = static_cast<char*>(realloc(retval, sz));
int rc = readlink("/proc/self/exe", retval, sz);
if (rc < 0) {
perror("GetProgramInvocationName:readlink");
free(retval);
retval = nullptr;
break;
}
if (rc < sz) {
retval[rc] = 0;
break;
}
// repeat if readlink may have truncated it's output
}
return retval;
})();
return argv0;
#elif defined(HAVE_PROGRAM_INVOCATION_NAME)
#ifdef __UCLIBC__
extern const char* program_invocation_name; // uclibc provides this
#else
@ -107,7 +139,7 @@ static const char* GetProgramInvocationName() {
return program_invocation_name;
return NULL;
#else
return NULL; // figure out a way to get argv[0]
return nullptr; // figure out a way to get argv[0]
#endif
}