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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <limits.h>
#include <pwd.h>
#include <string.h> // strerror
#include <sys/mount.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>
#include <signal.h>
#include <libprocstat.h>
#include "src/main/cpp/blaze_util.h"
#include "src/main/cpp/blaze_util_platform.h"
#include "src/main/cpp/util/errors.h"
#include "src/main/cpp/util/exit_code.h"
#include "src/main/cpp/util/file.h"
#include "src/main/cpp/util/port.h"
#include "src/main/cpp/util/strings.h"
namespace blaze {
using blaze_util::die;
using blaze_util::pdie;
using std::string;
string GetOutputRoot() {
char buf[2048];
struct passwd pwbuf;
struct passwd *pw = NULL;
int uid = getuid();
int r = getpwuid_r(uid, &pwbuf, buf, 2048, &pw);
if (r != -1 && pw != NULL) {
return blaze_util::JoinPath(pw->pw_dir, ".cache/bazel");
} else {
return "/tmp";
}
}
void WarnFilesystemType(const string &output_base) {
struct statfs buf = {};
if (statfs(output_base.c_str(), &buf) < 0) {
fprintf(stderr,
"WARNING: couldn't get file system type information for '%s': %s\n",
output_base.c_str(), strerror(errno));
return;
}
if (strcmp(buf.f_fstypename, "nfs") == 0) {
fprintf(stderr,
"WARNING: Output base '%s' is on NFS. This may lead "
"to surprising failures and undetermined behavior.\n",
output_base.c_str());
}
}
string GetSelfPath() {
char buffer[PATH_MAX] = {};
ssize_t bytes = readlink("/proc/curproc/file", buffer, sizeof(buffer));
if (bytes == sizeof(buffer)) {
// symlink contents truncated
bytes = -1;
errno = ENAMETOOLONG;
}
if (bytes == -1) {
pdie(blaze_exit_code::INTERNAL_ERROR, "error reading /proc/curproc/file");
}
buffer[bytes] = '\0'; // readlink does not NUL-terminate
return string(buffer);
}
pid_t GetPeerProcessId(int socket) { return -1; }
uint64_t MonotonicClock() {
struct timespec ts = {};
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec * 1000000000LL + ts.tv_nsec;
}
uint64_t ProcessClock() {
struct timespec ts = {};
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
return ts.tv_sec * 1000000000LL + ts.tv_nsec;
}
void SetScheduling(bool batch_cpu_scheduling, int io_nice_level) {
// Move ourself into a low priority CPU scheduling group if the
// machine is configured appropriately. Fail silently, because this
// isn't available on all kernels.
if (io_nice_level >= 0) {
if (blaze_util::sys_ioprio_set(
IOPRIO_WHO_PROCESS, getpid(),
IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, io_nice_level)) < 0) {
pdie(blaze_exit_code::INTERNAL_ERROR,
"ioprio_set() with class %d and level %d failed", IOPRIO_CLASS_BE,
io_nice_level);
}
}
}
string GetProcessCWD(int pid) {
if (kill(pid, 0) < 0) return "";
auto procstat = procstat_open_sysctl();
unsigned int n;
auto p = procstat_getprocs(procstat, KERN_PROC_PID, pid, &n);
string cwd;
if (p) {
if (n != 1) {
pdie(blaze_exit_code::INTERNAL_ERROR,
"expected exactly one process from procstat_getprocs, got %d", n);
}
auto files = procstat_getfiles(procstat, p, false);
filestat *entry;
STAILQ_FOREACH(entry, files, next) {
if (entry->fs_uflags & PS_FST_UFLAG_CDIR) {
cwd = entry->fs_path;
}
}
procstat_freefiles(procstat, files);
procstat_freeprocs(procstat, p);
}
procstat_close(procstat);
return cwd;
}
bool IsSharedLibrary(const string &filename) {
return blaze_util::ends_with(filename, ".so");
}
string GetDefaultHostJavabase() {
// if JAVA_HOME is defined, then use it as default.
const char *javahome = getenv("JAVA_HOME");
if (javahome != NULL) {
return string(javahome);
}
return "/usr/local/openjdk8";
}
} // namespace blaze
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