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// slang-unix-process-util.cpp
#include "../slang-process-util.h"
#include "../slang-common.h"
#include "../slang-string-util.h"
#include <stdio.h>
#include <stdlib.h>
//#include <dirent.h>
#include <errno.h>
#include <poll.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <time.h>
namespace Slang {
/* static */UnownedStringSlice ProcessUtil::getExecutableSuffix()
{
#if __CYGWIN__
return UnownedStringSlice::fromLiteral(".exe");
#else
return UnownedStringSlice::fromLiteral("");
#endif
}
/* static */void ProcessUtil::appendCommandLineEscaped(const UnownedStringSlice& slice, StringBuilder& out)
{
// TODO(JS): This escaping is not complete... !
if (slice.indexOf(' ') >= 0 || slice.indexOf('"') >= 0)
{
out << "\"";
const char* cur = slice.begin();
const char* end = slice.end();
while (cur < end)
{
char c = *cur++;
switch (c)
{
case '\"':
{
// Escape quotes.
out << "\\\"";
break;
}
default:
out.append(c);
}
}
out << "\"";
return;
}
out << slice;
}
/* static */String ProcessUtil::getCommandLineString(const CommandLine& commandLine)
{
// When outputting the command line we potentially need to escape the path to the
// command and args - that aren't already explicitly marked as escaped.
StringBuilder cmd;
appendCommandLineEscaped(commandLine.m_executable.getUnownedSlice(), cmd);
for (const auto& arg : commandLine.m_args)
{
cmd << " ";
if (arg.type == CommandLine::ArgType::Unescaped)
{
appendCommandLineEscaped(arg.value.getUnownedSlice(), cmd);
}
else
{
cmd << arg.value;
}
}
return cmd.ToString();
}
/* static */SlangResult ProcessUtil::execute(const CommandLine& commandLine, ExecuteResult& outExecuteResult)
{
outExecuteResult.init();
List<char const*> argPtrs;
// Add the command
argPtrs.add(commandLine.m_executable.getBuffer());
// Add all the args - they don't need any explicit escaping
for (auto arg : commandLine.m_args)
{
// All args for this target must be unescaped
SLANG_ASSERT(arg.type == CommandLine::ArgType::Unescaped);
argPtrs.add(arg.value.getBuffer());
}
// Terminate with a null
argPtrs.add(nullptr);
int stdoutPipe[2];
int stderrPipe[2];
if (pipe(stdoutPipe) == -1)
{
fprintf(stderr, "error: `pipe` failed\n");
return SLANG_FAIL;
}
if (pipe(stderrPipe) == -1)
{
fprintf(stderr, "error: `pipe` failed\n");
return SLANG_FAIL;
}
pid_t childProcessID = fork();
if (childProcessID == -1)
{
fprintf(stderr, "error: `fork` failed\n");
return SLANG_FAIL;
}
if (childProcessID == 0)
{
// We are the child process.
dup2(stdoutPipe[1], STDOUT_FILENO);
dup2(stderrPipe[1], STDERR_FILENO);
close(stdoutPipe[0]);
close(stdoutPipe[1]);
close(stderrPipe[0]);
close(stderrPipe[1]);
execvp(argPtrs[0], (char* const*)&argPtrs[0]);
// If we get here, then `exec` failed
fprintf(stderr, "error: `exec` failed\n");
return SLANG_FAIL;
}
else
{
// We are the parent process
close(stdoutPipe[1]);
close(stderrPipe[1]);
int stdoutFD = stdoutPipe[0];
int stderrFD = stderrPipe[0];
pollfd pollInfos[2];
nfds_t pollInfoCount = 2;
pollInfos[0].fd = stdoutFD;
pollInfos[0].events = POLLIN;
pollInfos[0].revents = 0;
pollInfos[1].fd = stderrFD;
pollInfos[1].events = POLLIN;
pollInfos[1].revents = 0;
int remainingCount = 2;
int iterations = 0;
while (remainingCount)
{
// Safeguard against infinite loop:
iterations++;
if (iterations > 10000)
{
fprintf(stderr, "poll(): %d iterations\n", iterations);
return SLANG_FAIL;
}
// Set a timeout of twenty seconds;
// we really shouldn't wait too long...
int pollTimeout = 20000;
int pollResult = poll(pollInfos, pollInfoCount, pollTimeout);
if (pollResult <= 0)
{
// If there was a signal that got in
// the way, then retry...
if (pollResult == -1 && errno == EINTR)
continue;
// timeout or error...
fprintf(stderr, "error: `poll` failed or timed out\n");
return SLANG_FAIL;
}
enum { kBufferSize = 1024 };
char buffer[kBufferSize];
if (pollInfos[0].revents)
{
auto count = read(stdoutFD, buffer, kBufferSize);
if (count <= 0)
{
// end-of-file
close(stdoutFD);
pollInfos[0].fd = -1;
remainingCount--;
}
outExecuteResult.standardOutput.append(buffer, buffer + count);
}
if (pollInfos[1].revents)
{
auto count = read(stderrFD, buffer, kBufferSize);
if (count <= 0)
{
// end-of-file
close(stderrFD);
pollInfos[1].fd = -1;
remainingCount--;
}
outExecuteResult.standardError.append(buffer, buffer + count);
}
}
int childStatus = 0;
iterations = 0;
for (;;)
{
// Safeguard against infinite loop:
iterations++;
if (iterations > 10000)
{
fprintf(stderr, "waitpid(): %d iterations\n", iterations);
return SLANG_FAIL;
}
pid_t terminatedProcessID = waitpid(childProcessID, &childStatus, 0);
if (terminatedProcessID == -1)
{
fprintf(stderr, "error: `waitpid` failed\n");
return SLANG_FAIL;
}
if (terminatedProcessID == childProcessID)
{
if (WIFEXITED(childStatus))
{
outExecuteResult.resultCode = (int)(int8_t)WEXITSTATUS(childStatus);
}
else
{
outExecuteResult.resultCode = 1;
}
return SLANG_OK;
}
}
}
return SLANG_FAIL;
}
/* static */uint64_t ProcessUtil::getClockFrequency()
{
return 1000000000;
}
/* static */uint64_t ProcessUtil::getClockTick()
{
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
return uint64_t(now.tv_sec) * 1000000000 + now.tv_nsec;
}
} // namespace Slang
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