summaryrefslogtreecommitdiffstats
path: root/nsprpub/pr/src/md/unix/uxproces.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /nsprpub/pr/src/md/unix/uxproces.c
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'nsprpub/pr/src/md/unix/uxproces.c')
-rw-r--r--nsprpub/pr/src/md/unix/uxproces.c877
1 files changed, 877 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/unix/uxproces.c b/nsprpub/pr/src/md/unix/uxproces.c
new file mode 100644
index 0000000000..4216c04424
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/uxproces.c
@@ -0,0 +1,877 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <string.h>
+#if defined(AIX)
+#include <dlfcn.h> /* For dlopen, dlsym, dlclose */
+#endif
+
+#if defined(DARWIN)
+#if defined(HAVE_CRT_EXTERNS_H)
+#include <crt_externs.h>
+#endif
+#else
+PR_IMPORT_DATA(char **) environ;
+#endif
+
+/*
+ * HP-UX 9 doesn't have the SA_RESTART flag.
+ */
+#ifndef SA_RESTART
+#define SA_RESTART 0
+#endif
+
+/*
+ **********************************************************************
+ *
+ * The Unix process routines
+ *
+ **********************************************************************
+ */
+
+#define _PR_SIGNALED_EXITSTATUS 256
+
+typedef enum pr_PidState {
+ _PR_PID_DETACHED,
+ _PR_PID_REAPED,
+ _PR_PID_WAITING
+} pr_PidState;
+
+typedef struct pr_PidRecord {
+ pid_t pid;
+ int exitStatus;
+ pr_PidState state;
+ PRCondVar *reapedCV;
+ struct pr_PidRecord *next;
+} pr_PidRecord;
+
+/*
+ * LinuxThreads are actually a kind of processes
+ * that can share the virtual address space and file descriptors.
+ */
+#if ((defined(LINUX) || defined(__GNU__) || defined(__GLIBC__)) \
+ && defined(_PR_PTHREADS))
+#define _PR_SHARE_CLONES
+#endif
+
+/*
+ * The macro _PR_NATIVE_THREADS indicates that we are
+ * using native threads only, so waitpid() blocks just the
+ * calling thread, not the process. In this case, the waitpid
+ * daemon thread can safely block in waitpid(). So we don't
+ * need to catch SIGCHLD, and the pipe to unblock PR_Poll() is
+ * also not necessary.
+ */
+
+#if defined(_PR_GLOBAL_THREADS_ONLY) \
+ || (defined(_PR_PTHREADS) \
+ && !defined(LINUX) && !defined(__GNU__) && !defined(__GLIBC__))
+#define _PR_NATIVE_THREADS
+#endif
+
+/*
+ * All the static variables used by the Unix process routines are
+ * collected in this structure.
+ */
+
+static struct {
+ PRCallOnceType once;
+ PRThread *thread;
+ PRLock *ml;
+#if defined(_PR_NATIVE_THREADS)
+ PRInt32 numProcs;
+ PRCondVar *cv;
+#else
+ int pipefd[2];
+#endif
+ pr_PidRecord **pidTable;
+
+#ifdef _PR_SHARE_CLONES
+ struct pr_CreateProcOp *opHead, *opTail;
+#endif
+
+#ifdef AIX
+ pid_t (*forkptr)(void); /* Newer versions of AIX (starting in 4.3.2)
+ * have f_fork, which is faster than the
+ * regular fork in a multithreaded process
+ * because it skips calling the fork handlers.
+ * So we look up the f_fork symbol to see if
+ * it's available and fall back on fork.
+ */
+#endif /* AIX */
+} pr_wp;
+
+#ifdef _PR_SHARE_CLONES
+static int pr_waitpid_daemon_exit;
+
+void
+_MD_unix_terminate_waitpid_daemon(void)
+{
+ if (pr_wp.thread) {
+ pr_waitpid_daemon_exit = 1;
+ write(pr_wp.pipefd[1], "", 1);
+ PR_JoinThread(pr_wp.thread);
+ }
+}
+#endif
+
+static PRStatus _MD_InitProcesses(void);
+#if !defined(_PR_NATIVE_THREADS)
+static void pr_InstallSigchldHandler(void);
+#endif
+
+static PRProcess *
+ForkAndExec(
+ const char *path,
+ char *const *argv,
+ char *const *envp,
+ const PRProcessAttr *attr)
+{
+ PRProcess *process;
+ int nEnv, idx;
+ char *const *childEnvp;
+ char **newEnvp = NULL;
+ int flags;
+
+ process = PR_NEW(PRProcess);
+ if (!process) {
+ PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+ return NULL;
+ }
+
+ childEnvp = envp;
+ if (attr && attr->fdInheritBuffer) {
+ PRBool found = PR_FALSE;
+
+ if (NULL == childEnvp) {
+#ifdef DARWIN
+#ifdef HAVE_CRT_EXTERNS_H
+ childEnvp = *(_NSGetEnviron());
+#else
+ /* _NSGetEnviron() is not available on iOS. */
+ PR_DELETE(process);
+ PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+ return NULL;
+#endif
+#else
+ childEnvp = environ;
+#endif
+ }
+
+ for (nEnv = 0; childEnvp[nEnv]; nEnv++) {
+ }
+ newEnvp = (char **) PR_MALLOC((nEnv + 2) * sizeof(char *));
+ if (NULL == newEnvp) {
+ PR_DELETE(process);
+ PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+ return NULL;
+ }
+ for (idx = 0; idx < nEnv; idx++) {
+ newEnvp[idx] = childEnvp[idx];
+ if (!found && !strncmp(newEnvp[idx], "NSPR_INHERIT_FDS=", 17)) {
+ newEnvp[idx] = attr->fdInheritBuffer;
+ found = PR_TRUE;
+ }
+ }
+ if (!found) {
+ newEnvp[idx++] = attr->fdInheritBuffer;
+ }
+ newEnvp[idx] = NULL;
+ childEnvp = newEnvp;
+ }
+
+#ifdef AIX
+ process->md.pid = (*pr_wp.forkptr)();
+#elif defined(NTO)
+ /*
+ * fork() & exec() does not work in a multithreaded process.
+ * Use spawn() instead.
+ */
+ {
+ int fd_map[3] = { 0, 1, 2 };
+
+ if (attr) {
+ if (attr->stdinFd && attr->stdinFd->secret->md.osfd != 0) {
+ fd_map[0] = dup(attr->stdinFd->secret->md.osfd);
+ flags = fcntl(fd_map[0], F_GETFL, 0);
+ if (flags & O_NONBLOCK) {
+ fcntl(fd_map[0], F_SETFL, flags & ~O_NONBLOCK);
+ }
+ }
+ if (attr->stdoutFd && attr->stdoutFd->secret->md.osfd != 1) {
+ fd_map[1] = dup(attr->stdoutFd->secret->md.osfd);
+ flags = fcntl(fd_map[1], F_GETFL, 0);
+ if (flags & O_NONBLOCK) {
+ fcntl(fd_map[1], F_SETFL, flags & ~O_NONBLOCK);
+ }
+ }
+ if (attr->stderrFd && attr->stderrFd->secret->md.osfd != 2) {
+ fd_map[2] = dup(attr->stderrFd->secret->md.osfd);
+ flags = fcntl(fd_map[2], F_GETFL, 0);
+ if (flags & O_NONBLOCK) {
+ fcntl(fd_map[2], F_SETFL, flags & ~O_NONBLOCK);
+ }
+ }
+
+ PR_ASSERT(attr->currentDirectory == NULL); /* not implemented */
+ }
+
+ process->md.pid = spawn(path, 3, fd_map, NULL, argv, childEnvp);
+
+ if (fd_map[0] != 0) {
+ close(fd_map[0]);
+ }
+ if (fd_map[1] != 1) {
+ close(fd_map[1]);
+ }
+ if (fd_map[2] != 2) {
+ close(fd_map[2]);
+ }
+ }
+#else
+ process->md.pid = fork();
+#endif
+ if ((pid_t) -1 == process->md.pid) {
+ PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, errno);
+ PR_DELETE(process);
+ if (newEnvp) {
+ PR_DELETE(newEnvp);
+ }
+ return NULL;
+ }
+ if (0 == process->md.pid) { /* the child process */
+ /*
+ * If the child process needs to exit, it must call _exit().
+ * Do not call exit(), because exit() will flush and close
+ * the standard I/O file descriptors, and hence corrupt
+ * the parent process's standard I/O data structures.
+ */
+
+#if !defined(NTO)
+ if (attr) {
+ /* the osfd's to redirect stdin, stdout, and stderr to */
+ int in_osfd = -1, out_osfd = -1, err_osfd = -1;
+
+ if (attr->stdinFd
+ && attr->stdinFd->secret->md.osfd != 0) {
+ in_osfd = attr->stdinFd->secret->md.osfd;
+ if (dup2(in_osfd, 0) != 0) {
+ _exit(1); /* failed */
+ }
+ flags = fcntl(0, F_GETFL, 0);
+ if (flags & O_NONBLOCK) {
+ fcntl(0, F_SETFL, flags & ~O_NONBLOCK);
+ }
+ }
+ if (attr->stdoutFd
+ && attr->stdoutFd->secret->md.osfd != 1) {
+ out_osfd = attr->stdoutFd->secret->md.osfd;
+ if (dup2(out_osfd, 1) != 1) {
+ _exit(1); /* failed */
+ }
+ flags = fcntl(1, F_GETFL, 0);
+ if (flags & O_NONBLOCK) {
+ fcntl(1, F_SETFL, flags & ~O_NONBLOCK);
+ }
+ }
+ if (attr->stderrFd
+ && attr->stderrFd->secret->md.osfd != 2) {
+ err_osfd = attr->stderrFd->secret->md.osfd;
+ if (dup2(err_osfd, 2) != 2) {
+ _exit(1); /* failed */
+ }
+ flags = fcntl(2, F_GETFL, 0);
+ if (flags & O_NONBLOCK) {
+ fcntl(2, F_SETFL, flags & ~O_NONBLOCK);
+ }
+ }
+ if (in_osfd != -1) {
+ close(in_osfd);
+ }
+ if (out_osfd != -1 && out_osfd != in_osfd) {
+ close(out_osfd);
+ }
+ if (err_osfd != -1 && err_osfd != in_osfd
+ && err_osfd != out_osfd) {
+ close(err_osfd);
+ }
+ if (attr->currentDirectory) {
+ if (chdir(attr->currentDirectory) < 0) {
+ _exit(1); /* failed */
+ }
+ }
+ }
+
+ if (childEnvp) {
+ (void)execve(path, argv, childEnvp);
+ } else {
+ /* Inherit the environment of the parent. */
+ (void)execv(path, argv);
+ }
+ /* Whoops! It returned. That's a bad sign. */
+ _exit(1);
+#endif /* !NTO */
+ }
+
+ if (newEnvp) {
+ PR_DELETE(newEnvp);
+ }
+
+#if defined(_PR_NATIVE_THREADS)
+ PR_Lock(pr_wp.ml);
+ if (0 == pr_wp.numProcs++) {
+ PR_NotifyCondVar(pr_wp.cv);
+ }
+ PR_Unlock(pr_wp.ml);
+#endif
+ return process;
+}
+
+#ifdef _PR_SHARE_CLONES
+
+struct pr_CreateProcOp {
+ const char *path;
+ char *const *argv;
+ char *const *envp;
+ const PRProcessAttr *attr;
+ PRProcess *process;
+ PRErrorCode prerror;
+ PRInt32 oserror;
+ PRBool done;
+ PRCondVar *doneCV;
+ struct pr_CreateProcOp *next;
+};
+
+PRProcess *
+_MD_CreateUnixProcess(
+ const char *path,
+ char *const *argv,
+ char *const *envp,
+ const PRProcessAttr *attr)
+{
+ struct pr_CreateProcOp *op;
+ PRProcess *proc;
+ int rv;
+
+ if (PR_CallOnce(&pr_wp.once, _MD_InitProcesses) == PR_FAILURE) {
+ return NULL;
+ }
+
+ op = PR_NEW(struct pr_CreateProcOp);
+ if (NULL == op) {
+ PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+ return NULL;
+ }
+ op->path = path;
+ op->argv = argv;
+ op->envp = envp;
+ op->attr = attr;
+ op->done = PR_FALSE;
+ op->doneCV = PR_NewCondVar(pr_wp.ml);
+ if (NULL == op->doneCV) {
+ PR_DELETE(op);
+ return NULL;
+ }
+ PR_Lock(pr_wp.ml);
+
+ /* add to the tail of op queue */
+ op->next = NULL;
+ if (pr_wp.opTail) {
+ pr_wp.opTail->next = op;
+ pr_wp.opTail = op;
+ } else {
+ PR_ASSERT(NULL == pr_wp.opHead);
+ pr_wp.opHead = pr_wp.opTail = op;
+ }
+
+ /* wake up the daemon thread */
+ do {
+ rv = write(pr_wp.pipefd[1], "", 1);
+ } while (-1 == rv && EINTR == errno);
+
+ while (op->done == PR_FALSE) {
+ PR_WaitCondVar(op->doneCV, PR_INTERVAL_NO_TIMEOUT);
+ }
+ PR_Unlock(pr_wp.ml);
+ PR_DestroyCondVar(op->doneCV);
+ proc = op->process;
+ if (!proc) {
+ PR_SetError(op->prerror, op->oserror);
+ }
+ PR_DELETE(op);
+ return proc;
+}
+
+#else /* ! _PR_SHARE_CLONES */
+
+PRProcess *
+_MD_CreateUnixProcess(
+ const char *path,
+ char *const *argv,
+ char *const *envp,
+ const PRProcessAttr *attr)
+{
+ if (PR_CallOnce(&pr_wp.once, _MD_InitProcesses) == PR_FAILURE) {
+ return NULL;
+ }
+ return ForkAndExec(path, argv, envp, attr);
+} /* _MD_CreateUnixProcess */
+
+#endif /* _PR_SHARE_CLONES */
+
+/*
+ * The pid table is a hashtable.
+ *
+ * The number of buckets in the hashtable (NBUCKETS) must be a power of 2.
+ */
+#define NBUCKETS_LOG2 6
+#define NBUCKETS (1 << NBUCKETS_LOG2)
+#define PID_HASH_MASK ((pid_t) (NBUCKETS - 1))
+
+static pr_PidRecord *
+FindPidTable(pid_t pid)
+{
+ pr_PidRecord *pRec;
+ int keyHash = (int) (pid & PID_HASH_MASK);
+
+ pRec = pr_wp.pidTable[keyHash];
+ while (pRec) {
+ if (pRec->pid == pid) {
+ break;
+ }
+ pRec = pRec->next;
+ }
+ return pRec;
+}
+
+static void
+InsertPidTable(pr_PidRecord *pRec)
+{
+ int keyHash = (int) (pRec->pid & PID_HASH_MASK);
+
+ pRec->next = pr_wp.pidTable[keyHash];
+ pr_wp.pidTable[keyHash] = pRec;
+}
+
+static void
+DeletePidTable(pr_PidRecord *pRec)
+{
+ int keyHash = (int) (pRec->pid & PID_HASH_MASK);
+
+ if (pr_wp.pidTable[keyHash] == pRec) {
+ pr_wp.pidTable[keyHash] = pRec->next;
+ } else {
+ pr_PidRecord *pred, *cur; /* predecessor and current */
+
+ pred = pr_wp.pidTable[keyHash];
+ cur = pred->next;
+ while (cur) {
+ if (cur == pRec) {
+ pred->next = cur->next;
+ break;
+ }
+ pred = cur;
+ cur = cur->next;
+ }
+ PR_ASSERT(cur != NULL);
+ }
+}
+
+static int
+ExtractExitStatus(int rawExitStatus)
+{
+ /*
+ * We did not specify the WCONTINUED and WUNTRACED options
+ * for waitpid, so these two events should not be reported.
+ */
+ PR_ASSERT(!WIFSTOPPED(rawExitStatus));
+#ifdef WIFCONTINUED
+ PR_ASSERT(!WIFCONTINUED(rawExitStatus));
+#endif
+ if (WIFEXITED(rawExitStatus)) {
+ return WEXITSTATUS(rawExitStatus);
+ }
+ PR_ASSERT(WIFSIGNALED(rawExitStatus));
+ return _PR_SIGNALED_EXITSTATUS;
+}
+
+static void
+ProcessReapedChildInternal(pid_t pid, int status)
+{
+ pr_PidRecord *pRec;
+
+ pRec = FindPidTable(pid);
+ if (NULL == pRec) {
+ pRec = PR_NEW(pr_PidRecord);
+ pRec->pid = pid;
+ pRec->state = _PR_PID_REAPED;
+ pRec->exitStatus = ExtractExitStatus(status);
+ pRec->reapedCV = NULL;
+ InsertPidTable(pRec);
+ } else {
+ PR_ASSERT(pRec->state != _PR_PID_REAPED);
+ if (_PR_PID_DETACHED == pRec->state) {
+ PR_ASSERT(NULL == pRec->reapedCV);
+ DeletePidTable(pRec);
+ PR_DELETE(pRec);
+ } else {
+ PR_ASSERT(_PR_PID_WAITING == pRec->state);
+ PR_ASSERT(NULL != pRec->reapedCV);
+ pRec->exitStatus = ExtractExitStatus(status);
+ pRec->state = _PR_PID_REAPED;
+ PR_NotifyCondVar(pRec->reapedCV);
+ }
+ }
+}
+
+#if defined(_PR_NATIVE_THREADS)
+
+/*
+ * If all the threads are native threads, the daemon thread is
+ * simpler. We don't need to catch the SIGCHLD signal. We can
+ * just have the daemon thread block in waitpid().
+ */
+
+static void WaitPidDaemonThread(void *unused)
+{
+ pid_t pid;
+ int status;
+
+ while (1) {
+ PR_Lock(pr_wp.ml);
+ while (0 == pr_wp.numProcs) {
+ PR_WaitCondVar(pr_wp.cv, PR_INTERVAL_NO_TIMEOUT);
+ }
+ PR_Unlock(pr_wp.ml);
+
+ while (1) {
+ do {
+ pid = waitpid((pid_t) -1, &status, 0);
+ } while ((pid_t) -1 == pid && EINTR == errno);
+
+ /*
+ * waitpid() cannot return 0 because we did not invoke it
+ * with the WNOHANG option.
+ */
+ PR_ASSERT(0 != pid);
+
+ /*
+ * The only possible error code is ECHILD. But if we do
+ * our accounting correctly, we should only call waitpid()
+ * when there is a child process to wait for.
+ */
+ PR_ASSERT((pid_t) -1 != pid);
+ if ((pid_t) -1 == pid) {
+ break;
+ }
+
+ PR_Lock(pr_wp.ml);
+ ProcessReapedChildInternal(pid, status);
+ pr_wp.numProcs--;
+ while (0 == pr_wp.numProcs) {
+ PR_WaitCondVar(pr_wp.cv, PR_INTERVAL_NO_TIMEOUT);
+ }
+ PR_Unlock(pr_wp.ml);
+ }
+ }
+}
+
+#else /* _PR_NATIVE_THREADS */
+
+static void WaitPidDaemonThread(void *unused)
+{
+ PRPollDesc pd;
+ PRFileDesc *fd;
+ int rv;
+ char buf[128];
+ pid_t pid;
+ int status;
+#ifdef _PR_SHARE_CLONES
+ struct pr_CreateProcOp *op;
+#endif
+
+#ifdef _PR_SHARE_CLONES
+ pr_InstallSigchldHandler();
+#endif
+
+ fd = PR_ImportFile(pr_wp.pipefd[0]);
+ PR_ASSERT(NULL != fd);
+ pd.fd = fd;
+ pd.in_flags = PR_POLL_READ;
+
+ while (1) {
+ rv = PR_Poll(&pd, 1, PR_INTERVAL_NO_TIMEOUT);
+ PR_ASSERT(1 == rv);
+
+#ifdef _PR_SHARE_CLONES
+ if (pr_waitpid_daemon_exit) {
+ return;
+ }
+ PR_Lock(pr_wp.ml);
+#endif
+
+ do {
+ rv = read(pr_wp.pipefd[0], buf, sizeof(buf));
+ } while (sizeof(buf) == rv || (-1 == rv && EINTR == errno));
+
+#ifdef _PR_SHARE_CLONES
+ while ((op = pr_wp.opHead) != NULL) {
+ PR_Unlock(pr_wp.ml);
+ op->process = ForkAndExec(op->path, op->argv,
+ op->envp, op->attr);
+ if (NULL == op->process) {
+ op->prerror = PR_GetError();
+ op->oserror = PR_GetOSError();
+ }
+ PR_Lock(pr_wp.ml);
+ pr_wp.opHead = op->next;
+ if (NULL == pr_wp.opHead) {
+ pr_wp.opTail = NULL;
+ }
+ op->done = PR_TRUE;
+ PR_NotifyCondVar(op->doneCV);
+ }
+ PR_Unlock(pr_wp.ml);
+#endif
+
+ while (1) {
+ do {
+ pid = waitpid((pid_t) -1, &status, WNOHANG);
+ } while ((pid_t) -1 == pid && EINTR == errno);
+ if (0 == pid) {
+ break;
+ }
+ if ((pid_t) -1 == pid) {
+ /* must be because we have no child processes */
+ PR_ASSERT(ECHILD == errno);
+ break;
+ }
+
+ PR_Lock(pr_wp.ml);
+ ProcessReapedChildInternal(pid, status);
+ PR_Unlock(pr_wp.ml);
+ }
+ }
+}
+
+static void pr_SigchldHandler(int sig)
+{
+ int errnoCopy;
+ int rv;
+
+ errnoCopy = errno;
+
+ do {
+ rv = write(pr_wp.pipefd[1], "", 1);
+ } while (-1 == rv && EINTR == errno);
+
+#ifdef DEBUG
+ if (-1 == rv && EAGAIN != errno && EWOULDBLOCK != errno) {
+ char *msg = "cannot write to pipe\n";
+ write(2, msg, strlen(msg) + 1);
+ _exit(1);
+ }
+#endif
+
+ errno = errnoCopy;
+}
+
+static void pr_InstallSigchldHandler()
+{
+ struct sigaction act, oact;
+ int rv;
+
+ act.sa_handler = pr_SigchldHandler;
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = SA_NOCLDSTOP | SA_RESTART;
+ rv = sigaction(SIGCHLD, &act, &oact);
+ PR_ASSERT(0 == rv);
+ /* Make sure we are not overriding someone else's SIGCHLD handler */
+#ifndef _PR_SHARE_CLONES
+ PR_ASSERT(oact.sa_handler == SIG_DFL);
+#endif
+}
+
+#endif /* !defined(_PR_NATIVE_THREADS) */
+
+static PRStatus _MD_InitProcesses(void)
+{
+#if !defined(_PR_NATIVE_THREADS)
+ int rv;
+ int flags;
+#endif
+
+#ifdef AIX
+ {
+ void *handle = dlopen(NULL, RTLD_NOW | RTLD_GLOBAL);
+ pr_wp.forkptr = (pid_t (*)(void)) dlsym(handle, "f_fork");
+ if (!pr_wp.forkptr) {
+ pr_wp.forkptr = fork;
+ }
+ dlclose(handle);
+ }
+#endif /* AIX */
+
+ pr_wp.ml = PR_NewLock();
+ PR_ASSERT(NULL != pr_wp.ml);
+
+#if defined(_PR_NATIVE_THREADS)
+ pr_wp.numProcs = 0;
+ pr_wp.cv = PR_NewCondVar(pr_wp.ml);
+ PR_ASSERT(NULL != pr_wp.cv);
+#else
+ rv = pipe(pr_wp.pipefd);
+ PR_ASSERT(0 == rv);
+ flags = fcntl(pr_wp.pipefd[0], F_GETFL, 0);
+ fcntl(pr_wp.pipefd[0], F_SETFL, flags | O_NONBLOCK);
+ flags = fcntl(pr_wp.pipefd[1], F_GETFL, 0);
+ fcntl(pr_wp.pipefd[1], F_SETFL, flags | O_NONBLOCK);
+
+#ifndef _PR_SHARE_CLONES
+ pr_InstallSigchldHandler();
+#endif
+#endif /* !_PR_NATIVE_THREADS */
+
+ pr_wp.thread = PR_CreateThread(PR_SYSTEM_THREAD,
+ WaitPidDaemonThread, NULL, PR_PRIORITY_NORMAL,
+#ifdef _PR_SHARE_CLONES
+ PR_GLOBAL_THREAD,
+#else
+ PR_LOCAL_THREAD,
+#endif
+ PR_JOINABLE_THREAD, 0);
+ PR_ASSERT(NULL != pr_wp.thread);
+
+ pr_wp.pidTable = (pr_PidRecord**)PR_CALLOC(NBUCKETS * sizeof(pr_PidRecord *));
+ PR_ASSERT(NULL != pr_wp.pidTable);
+ return PR_SUCCESS;
+}
+
+PRStatus _MD_DetachUnixProcess(PRProcess *process)
+{
+ PRStatus retVal = PR_SUCCESS;
+ pr_PidRecord *pRec;
+
+ PR_Lock(pr_wp.ml);
+ pRec = FindPidTable(process->md.pid);
+ if (NULL == pRec) {
+ pRec = PR_NEW(pr_PidRecord);
+ if (NULL == pRec) {
+ PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+ retVal = PR_FAILURE;
+ goto done;
+ }
+ pRec->pid = process->md.pid;
+ pRec->state = _PR_PID_DETACHED;
+ pRec->reapedCV = NULL;
+ InsertPidTable(pRec);
+ } else {
+ PR_ASSERT(_PR_PID_REAPED == pRec->state);
+ if (_PR_PID_REAPED != pRec->state) {
+ PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+ retVal = PR_FAILURE;
+ } else {
+ DeletePidTable(pRec);
+ PR_ASSERT(NULL == pRec->reapedCV);
+ PR_DELETE(pRec);
+ }
+ }
+ PR_DELETE(process);
+
+done:
+ PR_Unlock(pr_wp.ml);
+ return retVal;
+}
+
+PRStatus _MD_WaitUnixProcess(
+ PRProcess *process,
+ PRInt32 *exitCode)
+{
+ pr_PidRecord *pRec;
+ PRStatus retVal = PR_SUCCESS;
+ PRBool interrupted = PR_FALSE;
+
+ PR_Lock(pr_wp.ml);
+ pRec = FindPidTable(process->md.pid);
+ if (NULL == pRec) {
+ pRec = PR_NEW(pr_PidRecord);
+ if (NULL == pRec) {
+ PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+ retVal = PR_FAILURE;
+ goto done;
+ }
+ pRec->pid = process->md.pid;
+ pRec->state = _PR_PID_WAITING;
+ pRec->reapedCV = PR_NewCondVar(pr_wp.ml);
+ if (NULL == pRec->reapedCV) {
+ PR_DELETE(pRec);
+ retVal = PR_FAILURE;
+ goto done;
+ }
+ InsertPidTable(pRec);
+ while (!interrupted && _PR_PID_REAPED != pRec->state) {
+ if (PR_WaitCondVar(pRec->reapedCV,
+ PR_INTERVAL_NO_TIMEOUT) == PR_FAILURE
+ && PR_GetError() == PR_PENDING_INTERRUPT_ERROR) {
+ interrupted = PR_TRUE;
+ }
+ }
+ if (_PR_PID_REAPED == pRec->state) {
+ if (exitCode) {
+ *exitCode = pRec->exitStatus;
+ }
+ } else {
+ PR_ASSERT(interrupted);
+ retVal = PR_FAILURE;
+ }
+ DeletePidTable(pRec);
+ PR_DestroyCondVar(pRec->reapedCV);
+ PR_DELETE(pRec);
+ } else {
+ PR_ASSERT(_PR_PID_REAPED == pRec->state);
+ PR_ASSERT(NULL == pRec->reapedCV);
+ DeletePidTable(pRec);
+ if (exitCode) {
+ *exitCode = pRec->exitStatus;
+ }
+ PR_DELETE(pRec);
+ }
+ PR_DELETE(process);
+
+done:
+ PR_Unlock(pr_wp.ml);
+ return retVal;
+} /* _MD_WaitUnixProcess */
+
+PRStatus _MD_KillUnixProcess(PRProcess *process)
+{
+ PRErrorCode prerror;
+ PRInt32 oserror;
+
+ if (kill(process->md.pid, SIGKILL) == 0) {
+ return PR_SUCCESS;
+ }
+ oserror = errno;
+ switch (oserror) {
+ case EPERM:
+ prerror = PR_NO_ACCESS_RIGHTS_ERROR;
+ break;
+ case ESRCH:
+ prerror = PR_INVALID_ARGUMENT_ERROR;
+ break;
+ default:
+ prerror = PR_UNKNOWN_ERROR;
+ break;
+ }
+ PR_SetError(prerror, oserror);
+ return PR_FAILURE;
+} /* _MD_KillUnixProcess */