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/* -*- Mode: C++; tab-width: 8; c-basic-offset: 8 -*- */
/* 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 <stdio.h>
#include <signal.h>
#define _PR_SIGNALED_EXITSTATUS 256
PRProcess*
_MD_create_process (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;
PRBool found = PR_FALSE;
process = PR_NEW(PRProcess);
if (!process) {
PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
return NULL;
}
childEnvp = envp;
if (attr && attr->fdInheritBuffer) {
if (NULL == childEnvp) {
childEnvp = environ;
}
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;
}
process->md.pid = fork();
if ((pid_t) -1 == process->md.pid) {
PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, errno);
PR_DELETE(process);
if (newEnvp) {
PR_DELETE(newEnvp);
}
return NULL;
} else 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 (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);
}
if (newEnvp) {
PR_DELETE(newEnvp);
}
return process;
}
PRStatus
_MD_detach_process (PRProcess *process)
{
/* If we kept a process table like unix does,
* we'd remove the entry here.
* Since we dont', just delete the process variable
*/
PR_DELETE(process);
return PR_SUCCESS;
}
PRStatus
_MD_wait_process (PRProcess *process, PRInt32 *exitCode)
{
PRStatus retVal = PR_SUCCESS;
int ret, status;
/* Ignore interruptions */
do {
ret = waitpid(process->md.pid, &status, 0);
} while (ret == -1 && errno == EINTR);
/*
* waitpid() cannot return 0 because we did not invoke it
* with the WNOHANG option.
*/
PR_ASSERT(0 != ret);
if (ret < 0) {
PR_SetError(PR_UNKNOWN_ERROR, _MD_ERRNO());
return PR_FAILURE;
}
/* If child process exited normally, return child exit code */
if (WIFEXITED(status)) {
*exitCode = WEXITSTATUS(status);
} else {
PR_ASSERT(WIFSIGNALED(status));
*exitCode = _PR_SIGNALED_EXITSTATUS;
}
PR_DELETE(process);
return PR_SUCCESS;
}
PRStatus
_MD_kill_process (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;
}
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