| 1 | /* $Id: process-posix.cpp 20498 2009-06-12 11:05:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Process, POSIX.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | *
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| 26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 |
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| 32 |
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| 33 | /*******************************************************************************
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| 34 | * Header Files *
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| 35 | *******************************************************************************/
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| 36 | #define LOG_GROUP RTLOGGROUP_PROCESS
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| 37 | #include <unistd.h>
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| 38 | #include <stdlib.h>
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| 39 | #include <errno.h>
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| 40 | #include <sys/types.h>
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| 41 | #include <sys/stat.h>
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| 42 | #include <sys/wait.h>
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| 43 | #include <fcntl.h>
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| 44 | #include <signal.h>
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| 45 | #if defined(RT_OS_LINUX) || defined(RT_OS_OS2)
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| 46 | # define HAVE_POSIX_SPAWN 1
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| 47 | #endif
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| 48 | #ifdef HAVE_POSIX_SPAWN
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| 49 | # include <spawn.h>
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| 50 | #endif
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| 51 | #ifdef RT_OS_DARWIN
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| 52 | # include <mach-o/dyld.h>
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| 53 | #endif
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| 54 |
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| 55 | #include <iprt/process.h>
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| 56 | #include <iprt/string.h>
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| 57 | #include <iprt/assert.h>
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| 58 | #include <iprt/err.h>
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| 59 | #include <iprt/env.h>
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| 60 | #include "internal/process.h"
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| 61 |
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| 62 |
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| 63 |
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| 64 | RTR3DECL(int) RTProcCreate(const char *pszExec, const char * const *papszArgs, RTENV Env, unsigned fFlags, PRTPROCESS pProcess)
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| 65 | {
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| 66 | int rc;
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| 67 |
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| 68 | /*
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| 69 | * Validate input.
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| 70 | */
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| 71 | AssertPtrReturn(pszExec, VERR_INVALID_POINTER);
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| 72 | AssertReturn(*pszExec, VERR_INVALID_PARAMETER);
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| 73 | AssertReturn(!(fFlags & ~RTPROC_FLAGS_DAEMONIZE), VERR_INVALID_PARAMETER);
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| 74 | AssertReturn(Env != NIL_RTENV, VERR_INVALID_PARAMETER);
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| 75 | const char * const *papszEnv = RTEnvGetExecEnvP(Env);
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| 76 | AssertPtrReturn(papszEnv, VERR_INVALID_HANDLE);
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| 77 | AssertPtrReturn(papszArgs, VERR_INVALID_PARAMETER);
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| 78 | /* later: path searching. */
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| 79 |
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| 80 |
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| 81 | /*
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| 82 | * Check for execute access to the file.
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| 83 | */
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| 84 | if (access(pszExec, X_OK))
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| 85 | {
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| 86 | rc = RTErrConvertFromErrno(errno);
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| 87 | AssertMsgFailed(("'%s' %Rrc!\n", pszExec, rc));
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| 88 | return rc;
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| 89 | }
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| 90 |
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| 91 | #if 0
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| 92 | /*
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| 93 | * Squeeze gdb --args in front of what's being spawned.
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| 94 | */
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| 95 | unsigned cArgs = 0;
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| 96 | while (papszArgs[cArgs])
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| 97 | cArgs++;
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| 98 | cArgs += 3;
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| 99 | const char **papszArgsTmp = (const char **)alloca(cArgs * sizeof(char *));
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| 100 | papszArgsTmp[0] = "/usr/bin/gdb";
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| 101 | papszArgsTmp[1] = "--args";
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| 102 | papszArgsTmp[2] = pszExec;
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| 103 | for (unsigned i = 1; papszArgs[i]; i++)
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| 104 | papszArgsTmp[i + 2] = papszArgs[i];
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| 105 | papszArgsTmp[cArgs - 1] = NULL;
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| 106 | pszExec = papszArgsTmp[0];
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| 107 | papszArgs = papszArgsTmp;
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| 108 | #endif
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| 109 |
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| 110 | /*
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| 111 | * Spawn the child.
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| 112 | */
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| 113 | pid_t pid;
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| 114 | #ifdef HAVE_POSIX_SPAWN
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| 115 | if (!(fFlags & RTPROC_FLAGS_DAEMONIZE))
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| 116 | {
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| 117 | /** @todo check if it requires any of those two attributes, don't remember atm. */
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| 118 | rc = posix_spawn(&pid, pszExec, NULL, NULL, (char * const *)papszArgs,
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| 119 | (char * const *)papszEnv);
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| 120 | if (!rc)
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| 121 | {
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| 122 | if (pProcess)
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| 123 | *pProcess = pid;
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| 124 | return VINF_SUCCESS;
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| 125 | }
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| 126 | }
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| 127 | else
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| 128 | #endif
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| 129 | {
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| 130 | pid = fork();
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| 131 | if (!pid)
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| 132 | {
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| 133 | if (fFlags & RTPROC_FLAGS_DAEMONIZE)
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| 134 | {
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| 135 | rc = RTProcDaemonize(true /* fNoChDir */, false /* fNoClose */, NULL /* pszPidFile */);
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| 136 | AssertReleaseMsgFailed(("RTProcDaemonize returns %Rrc errno=%d\n", rc, errno));
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| 137 | exit(127);
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| 138 | }
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| 139 | rc = execve(pszExec, (char * const *)papszArgs, (char * const *)papszEnv);
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| 140 | AssertReleaseMsgFailed(("execve returns %d errno=%d\n", rc, errno));
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| 141 | exit(127);
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| 142 | }
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| 143 | if (pid > 0)
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| 144 | {
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| 145 | if (pProcess)
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| 146 | *pProcess = pid;
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| 147 | return VINF_SUCCESS;
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| 148 | }
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| 149 | rc = errno;
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| 150 | }
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| 151 |
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| 152 | /* failure, errno value in rc. */
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| 153 | AssertMsgFailed(("spawn/exec failed rc=%d\n", rc)); /* this migth be annoying... */
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| 154 | return RTErrConvertFromErrno(rc);
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| 155 | }
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| 156 |
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| 157 |
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| 158 | RTR3DECL(int) RTProcWait(RTPROCESS Process, unsigned fFlags, PRTPROCSTATUS pProcStatus)
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| 159 | {
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| 160 | int rc;
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| 161 | do rc = RTProcWaitNoResume(Process, fFlags, pProcStatus);
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| 162 | while (rc == VERR_INTERRUPTED);
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| 163 | return rc;
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| 164 | }
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| 165 |
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| 166 | RTR3DECL(int) RTProcWaitNoResume(RTPROCESS Process, unsigned fFlags, PRTPROCSTATUS pProcStatus)
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| 167 | {
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| 168 | /*
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| 169 | * Validate input.
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| 170 | */
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| 171 | if (Process <= 0)
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| 172 | {
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| 173 | AssertMsgFailed(("Invalid Process=%d\n", Process));
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| 174 | return VERR_INVALID_PARAMETER;
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| 175 | }
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| 176 | if (fFlags & ~(RTPROCWAIT_FLAGS_NOBLOCK | RTPROCWAIT_FLAGS_BLOCK))
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| 177 | {
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| 178 | AssertMsgFailed(("Invalid flags %#x\n", fFlags));
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| 179 | return VERR_INVALID_PARAMETER;
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| 180 | }
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| 181 |
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| 182 | /*
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| 183 | * Performe the wait.
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| 184 | */
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| 185 | int iStatus = 0;
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| 186 | int rc = waitpid(Process, &iStatus, fFlags & RTPROCWAIT_FLAGS_NOBLOCK ? WNOHANG : 0);
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| 187 | if (rc > 0)
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| 188 | {
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| 189 | /*
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| 190 | * Fill in the status structure.
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| 191 | */
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| 192 | if (pProcStatus)
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| 193 | {
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| 194 | if (WIFEXITED(iStatus))
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| 195 | {
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| 196 | pProcStatus->enmReason = RTPROCEXITREASON_NORMAL;
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| 197 | pProcStatus->iStatus = WEXITSTATUS(iStatus);
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| 198 | }
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| 199 | else if (WIFSIGNALED(iStatus))
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| 200 | {
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| 201 | pProcStatus->enmReason = RTPROCEXITREASON_SIGNAL;
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| 202 | pProcStatus->iStatus = WTERMSIG(iStatus);
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| 203 | }
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| 204 | else
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| 205 | {
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| 206 | Assert(!WIFSTOPPED(iStatus));
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| 207 | pProcStatus->enmReason = RTPROCEXITREASON_ABEND;
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| 208 | pProcStatus->iStatus = iStatus;
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| 209 | }
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| 210 | }
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| 211 | return VINF_SUCCESS;
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| 212 | }
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| 213 |
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| 214 | /*
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| 215 | * Child running?
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| 216 | */
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| 217 | if (!rc)
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| 218 | {
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| 219 | Assert(fFlags & RTPROCWAIT_FLAGS_NOBLOCK);
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| 220 | return VERR_PROCESS_RUNNING;
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| 221 | }
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| 222 |
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| 223 | /*
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| 224 | * Figure out which error to return.
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| 225 | */
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| 226 | int iErr = errno;
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| 227 | if (iErr == ECHILD)
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| 228 | return VERR_PROCESS_NOT_FOUND;
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| 229 | return RTErrConvertFromErrno(iErr);
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| 230 | }
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| 231 |
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| 232 |
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| 233 | RTR3DECL(int) RTProcTerminate(RTPROCESS Process)
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| 234 | {
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| 235 | if (!kill(Process, SIGKILL))
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| 236 | return VINF_SUCCESS;
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| 237 | return RTErrConvertFromErrno(errno);
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| 238 | }
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| 239 |
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| 240 |
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| 241 | RTR3DECL(uint64_t) RTProcGetAffinityMask()
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| 242 | {
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| 243 | // @todo
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| 244 | return 1;
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| 245 | }
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| 246 |
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| 247 |
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| 248 | /**
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| 249 | * Daemonize the current process, making it a background process. The current
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| 250 | * process will exit if daemonizing is successful.
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| 251 | *
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| 252 | * @returns iprt status code.
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| 253 | * @param fNoChDir Pass false to change working directory to "/".
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| 254 | * @param fNoClose Pass false to redirect standard file streams to the null device.
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| 255 | * @param pszPidfile Path to a file to write the process id of the daemon
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| 256 | * process to. Daemonizing will fail if this file already
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| 257 | * exists or cannot be written. May be NULL.
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| 258 | */
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| 259 | RTR3DECL(int) RTProcDaemonize(bool fNoChDir, bool fNoClose, const char *pszPidfile)
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| 260 | {
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| 261 | /*
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| 262 | * Fork the child process in a new session and quit the parent.
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| 263 | *
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| 264 | * - fork once and create a new session (setsid). This will detach us
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| 265 | * from the controlling tty meaning that we won't receive the SIGHUP
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| 266 | * (or any other signal) sent to that session.
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| 267 | * - The SIGHUP signal is ignored because the session/parent may throw
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| 268 | * us one before we get to the setsid.
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| 269 | * - When the parent exit(0) we will become an orphan and re-parented to
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| 270 | * the init process.
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| 271 | * - Because of the sometimes unexpected semantics of assigning the
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| 272 | * controlling tty automagically when a session leader first opens a tty,
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| 273 | * we will fork() once more to get rid of the session leadership role.
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| 274 | */
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| 275 |
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| 276 | /* We start off by opening the pidfile, so that we can fail straight away
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| 277 | * if it already exists. */
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| 278 | int fdPidfile = -1;
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| 279 | if (pszPidfile != NULL)
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| 280 | {
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| 281 | /* @note the exclusive create is not guaranteed on all file
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| 282 | * systems (e.g. NFSv2) */
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| 283 | if ((fdPidfile = open(pszPidfile, O_RDWR | O_CREAT | O_EXCL, 0644)) == -1)
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| 284 | return RTErrConvertFromErrno(errno);
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| 285 | }
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| 286 |
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| 287 | /* Ignore SIGHUP straight away. */
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| 288 | struct sigaction OldSigAct;
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| 289 | struct sigaction SigAct;
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| 290 | memset(&SigAct, 0, sizeof(SigAct));
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| 291 | SigAct.sa_handler = SIG_IGN;
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| 292 | int rcSigAct = sigaction(SIGHUP, &SigAct, &OldSigAct);
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| 293 |
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| 294 | /* First fork, to become independent process. */
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| 295 | pid_t pid = fork();
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| 296 | if (pid == -1)
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| 297 | return RTErrConvertFromErrno(errno);
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| 298 | if (pid != 0)
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| 299 | {
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| 300 | /* Parent exits, no longer necessary. Child creates gets reparented
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| 301 | * to the init process. */
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| 302 | exit(0);
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| 303 | }
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| 304 |
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| 305 | /* Create new session, fix up the standard file descriptors and the
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| 306 | * current working directory. */
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| 307 | pid_t newpgid = setsid();
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| 308 | int SavedErrno = errno;
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| 309 | if (rcSigAct != -1)
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| 310 | sigaction(SIGHUP, &OldSigAct, NULL);
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| 311 | if (newpgid == -1)
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| 312 | return RTErrConvertFromErrno(SavedErrno);
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| 313 |
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| 314 | if (!fNoClose)
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| 315 | {
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| 316 | /* Open stdin(0), stdout(1) and stderr(2) as /dev/null. */
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| 317 | int fd = open("/dev/null", O_RDWR);
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| 318 | if (fd == -1) /* paranoia */
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| 319 | {
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| 320 | close(STDIN_FILENO);
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| 321 | close(STDOUT_FILENO);
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| 322 | close(STDERR_FILENO);
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| 323 | fd = open("/dev/null", O_RDWR);
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| 324 | }
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| 325 | if (fd != -1)
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| 326 | {
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| 327 | dup2(fd, STDIN_FILENO);
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| 328 | dup2(fd, STDOUT_FILENO);
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| 329 | dup2(fd, STDERR_FILENO);
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| 330 | if (fd > 2)
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| 331 | close(fd);
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| 332 | }
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| 333 | }
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| 334 |
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| 335 | if (!fNoChDir)
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| 336 | chdir("/");
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| 337 |
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| 338 | /* Second fork to lose session leader status. */
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| 339 | pid = fork();
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| 340 | if (pid == -1)
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| 341 | return RTErrConvertFromErrno(errno);
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| 342 | if (pid != 0)
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| 343 | {
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| 344 | /* Write the pid file, this is done in the parent, before exiting. */
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| 345 | if (fdPidfile != -1)
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| 346 | {
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| 347 | char szBuf[256];
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| 348 | size_t cbPid = RTStrPrintf(szBuf, sizeof(szBuf), "%d\n", pid);
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| 349 | write(fdPidfile, szBuf, cbPid);
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| 350 | close(fdPidfile);
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| 351 | }
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| 352 | exit(0);
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| 353 | }
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| 354 |
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| 355 | return VINF_SUCCESS;
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| 356 | }
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| 357 |
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