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polish error messages (not in Polish though)

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This commit is contained in:
Benoit Jacob 2020-11-12 16:01:38 -05:00
parent e2c1af9d5a
commit 89b184311d
1 changed files with 58 additions and 15 deletions
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71
client/TracySysTrace.cpp
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@ -889,7 +889,12 @@ static void SetupSampling( int64_t& samplingPeriod )
#endif
#endif
WriteBufferToFile("/proc/sys/kernel/perf_event_paranoid", "0");
// If the 'paranoid' file exists, it may beed to be set to 0 before we can
// use perf_event_open.
const char paranoid_filename[] = "/proc/sys/kernel/perf_event_paranoid";
if (!WriteBufferToFile(paranoid_filename, "0") && errno != ENOENT) {
TRACY_LOG_ERROR_ERRNO("failed to write to %s", paranoid_filename);
}
for( int i=0; i<s_numCpus; i++ )
{
@ -1032,9 +1037,49 @@ static bool TraceWrite( const char* path, const char* val )
return true;
}
static void PrintErrorAboutNeedingRootPermissions() {
fprintf(stderr, R"TXT(
#############################################################################
A possible reason for that failure may be that that required root permissions.
If it's acceptable for your profilee program to run as root, that's
easiest, but as this isn't always possible, tracy instrumentation
supports non-root programs by creating subprocesses running only some file
I/O as root, by exec'ing the command `sudo` (or, on Android, `su`) in a
non-interactive way (e.g. `su -n`).
You are seeing this error message because the latter just failed. Typically,
that is because sudo or su needs authentication to proceed, so it was not
possible to perform a non-interactive sudo or su.
Ways to fix this:
0. As noted above, consider running the whole program as root if possible.
1. Try relying on your system's persistence of authentication: maybe it
does not require a sudo or su password every time? It may work
to perform any sudo or su authentication manually in your terminal,
before running your program again, letting it ride on the persistent
authentication.
2. Try editing your system configuration (e.g. see `man sudo`) so it does
not ask for a password. Note, that should already be the case on Android
on any rooted device. On Android, the first thing to check, then, is that
your device is rooted (can you get a root shell? Does `su` work?)
3. Try editying this file,
%s,
to make it actually authenticate. For example, instead of doing `sudo -n`,
how about trying `sudo -A` to get a password prompt from a external
program, or maybe even just `sudo -S`?
#############################################################################
)TXT", __FILE__);
}
bool SysTraceStart( int64_t& samplingPeriod )
{
if( !TraceWrite( TracingOn, "0" ) ) return false;
if( !TraceWrite( TracingOn, "0" ) ) {
PrintErrorAboutNeedingRootPermissions();
return false;
}
if( !TraceWrite( CurrentTracer, "nop" ) ) return false;
if( !TraceWrite( TraceOptions, "norecord-cmd" ) ) return false;
if( !TraceWrite( TraceOptions, "norecord-tgid" ) ) return false;
@ -1379,12 +1424,17 @@ void SysTraceSendExternalName( uint64_t thread )
GetProfiler().SendString( thread, buf, QueueType::ExternalThreadName );
return true;
})) {
TRACY_LOG_ERROR_ERRNO("failed to read %s", fn);
// This function frequently fails to read files because the /proc/$tid/
// files that it tries to read go away when the thread terminates, and there
// is no synchronization to prevent that from happening.
// To limit logging verbosity, we don't report these failures.
// The user may still see stderr messages coming directly from the exec'd
// `dd` command.
return;
}
sprintf( fn, "/proc/%" PRIu64 "/status", thread );
if (!ReadFileWithFunction(fn, [=](int fd){
ReadFileWithFunction(fn, [=](int fd){
FILE* f = fdopen(dup(fd), "rb");
if (!f) {
return false;
@ -1415,7 +1465,7 @@ void SysTraceSendExternalName( uint64_t thread )
}
char fn[256];
sprintf( fn, "/proc/%i/comm", pid );
if (!ReadFileWithFunction(fn, [=](int fd){
ReadFileWithFunction(fn, [=](int fd){
char buf[256];
const auto sz = read( fd, buf, sizeof(buf));
if (sz == -1) {
@ -1424,17 +1474,10 @@ void SysTraceSendExternalName( uint64_t thread )
if( sz > 0 && buf[sz-1] == '\n' ) buf[sz-1] = '\0';
GetProfiler().SendString( thread, buf, QueueType::ExternalName );
return true;
})) {
TRACY_LOG_ERROR_ERRNO("failed to read %s", fn);
return false;
}
});
}
return true;
})) {
TRACY_LOG_ERROR_ERRNO("failed to read %s", fn);
GetProfiler().SendString( thread, "???", 3, QueueType::ExternalName );
return;
}
});
}
}