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freebsd/usr.bin/make/main.c
Dag-Erling Smørgrav 4358431405 Install a SIGCHLD handler so select(2) will be interrupted when a child 
terminates.  Without this patch, 'make -j1 buildworld' takes about 30%
longer than 'make -B buildworld' on my 2.4 GHz P4; the difference is
probably even larger on faster systems.  With this patch, there is no
perceptible difference in wall time between the two.

Submitted by:	bde
MFC after:	3 days
2003-12-13 15:26:27 +00:00

1161 lines
29 KiB
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/*
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)main.c 8.3 (Berkeley) 3/19/94
*/
#ifndef lint
#if 0
static char copyright[] =
"@(#) Copyright (c) 1988, 1989, 1990, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* main.c --
* The main file for this entire program. Exit routines etc
* reside here.
*
* Utility functions defined in this file:
* Main_ParseArgLine Takes a line of arguments, breaks them and
* treats them as if they were given when first
* invoked. Used by the parse module to implement
* the .MFLAGS target.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/signal.h>
#include <sys/stat.h>
#if defined(__i386__)
#include <sys/sysctl.h>
#endif
#ifndef MACHINE
#include <sys/utsname.h>
#endif
#include <sys/wait.h>
#include <err.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sysexits.h>
#include <stdarg.h>
#include <unistd.h>
#include "make.h"
#include "hash.h"
#include "dir.h"
#include "job.h"
#include "pathnames.h"
#define WANT_ENV_MKLVL 1
#ifndef DEFMAXLOCAL
#define DEFMAXLOCAL DEFMAXJOBS
#endif /* DEFMAXLOCAL */
#define MAKEFLAGS ".MAKEFLAGS"
Lst create; /* Targets to be made */
time_t now; /* Time at start of make */
GNode *DEFAULT; /* .DEFAULT node */
Boolean allPrecious; /* .PRECIOUS given on line by itself */
static Boolean noBuiltins; /* -r flag */
static Lst makefiles; /* ordered list of makefiles to read */
static Boolean expandVars; /* fully expand printed variables */
static Lst variables; /* list of variables to print */
int maxJobs; /* -j argument */
static Boolean forceJobs; /* -j argument given */
static int maxLocal; /* -L argument */
Boolean compatMake; /* -B argument */
Boolean debug; /* -d flag */
Boolean noExecute; /* -n flag */
Boolean keepgoing; /* -k flag */
Boolean queryFlag; /* -q flag */
Boolean touchFlag; /* -t flag */
Boolean usePipes; /* !-P flag */
Boolean ignoreErrors; /* -i flag */
Boolean beSilent; /* -s flag */
Boolean beVerbose; /* -v flag */
Boolean oldVars; /* variable substitution style */
Boolean checkEnvFirst; /* -e flag */
Lst envFirstVars; /* (-E) vars to override from env */
Boolean jobsRunning; /* TRUE if the jobs might be running */
static void MainParseArgs(int, char **);
char * chdir_verify_path(char *, char *);
static int ReadMakefile(void *, void *);
static void usage(void);
static char *curdir; /* startup directory */
static char *objdir; /* where we chdir'ed to */
/*-
* MainParseArgs --
* Parse a given argument vector. Called from main() and from
* Main_ParseArgLine() when the .MAKEFLAGS target is used.
*
* XXX: Deal with command line overriding .MAKEFLAGS in makefile
*
* Results:
* None
*
* Side Effects:
* Various global and local flags will be set depending on the flags
* given
*/
static void
MainParseArgs(int argc, char **argv)
{
char *p;
int c;
optind = 1; /* since we're called more than once */
#ifdef REMOTE
# define OPTFLAGS "BC:D:E:I:L:PSV:Xd:ef:ij:km:nqrstv"
#else
# define OPTFLAGS "BC:D:E:I:PSV:Xd:ef:ij:km:nqrstv"
#endif
rearg: while((c = getopt(argc, argv, OPTFLAGS)) != -1) {
switch(c) {
case 'C':
if (chdir(optarg) == -1)
err(1, "chdir %s", optarg);
break;
case 'D':
Var_Set(optarg, "1", VAR_GLOBAL);
Var_Append(MAKEFLAGS, "-D", VAR_GLOBAL);
Var_Append(MAKEFLAGS, optarg, VAR_GLOBAL);
break;
case 'I':
Parse_AddIncludeDir(optarg);
Var_Append(MAKEFLAGS, "-I", VAR_GLOBAL);
Var_Append(MAKEFLAGS, optarg, VAR_GLOBAL);
break;
case 'V':
(void)Lst_AtEnd(variables, (void *)optarg);
Var_Append(MAKEFLAGS, "-V", VAR_GLOBAL);
Var_Append(MAKEFLAGS, optarg, VAR_GLOBAL);
break;
case 'X':
expandVars = FALSE;
break;
case 'B':
compatMake = TRUE;
Var_Append(MAKEFLAGS, "-B", VAR_GLOBAL);
break;
#ifdef REMOTE
case 'L': {
char *endptr;
maxLocal = strtol(optarg, &endptr, 10);
if (maxLocal < 0 || *endptr != '\0') {
warnx("illegal number, -L argument -- %s",
optarg);
usage();
}
Var_Append(MAKEFLAGS, "-L", VAR_GLOBAL);
Var_Append(MAKEFLAGS, optarg, VAR_GLOBAL);
break;
}
#endif
case 'P':
usePipes = FALSE;
Var_Append(MAKEFLAGS, "-P", VAR_GLOBAL);
break;
case 'S':
keepgoing = FALSE;
Var_Append(MAKEFLAGS, "-S", VAR_GLOBAL);
break;
case 'd': {
char *modules = optarg;
for (; *modules; ++modules)
switch (*modules) {
case 'A':
debug = ~0;
break;
case 'a':
debug |= DEBUG_ARCH;
break;
case 'c':
debug |= DEBUG_COND;
break;
case 'd':
debug |= DEBUG_DIR;
break;
case 'f':
debug |= DEBUG_FOR;
break;
case 'g':
if (modules[1] == '1') {
debug |= DEBUG_GRAPH1;
++modules;
}
else if (modules[1] == '2') {
debug |= DEBUG_GRAPH2;
++modules;
}
break;
case 'j':
debug |= DEBUG_JOB;
break;
case 'l':
debug |= DEBUG_LOUD;
break;
case 'm':
debug |= DEBUG_MAKE;
break;
case 's':
debug |= DEBUG_SUFF;
break;
case 't':
debug |= DEBUG_TARG;
break;
case 'v':
debug |= DEBUG_VAR;
break;
default:
warnx("illegal argument to d option -- %c", *modules);
usage();
}
Var_Append(MAKEFLAGS, "-d", VAR_GLOBAL);
Var_Append(MAKEFLAGS, optarg, VAR_GLOBAL);
break;
}
case 'E':
p = emalloc(strlen(optarg) + 1);
(void)strcpy(p, optarg);
(void)Lst_AtEnd(envFirstVars, (void *)p);
Var_Append(MAKEFLAGS, "-E", VAR_GLOBAL);
Var_Append(MAKEFLAGS, optarg, VAR_GLOBAL);
break;
case 'e':
checkEnvFirst = TRUE;
Var_Append(MAKEFLAGS, "-e", VAR_GLOBAL);
break;
case 'f':
(void)Lst_AtEnd(makefiles, (void *)optarg);
break;
case 'i':
ignoreErrors = TRUE;
Var_Append(MAKEFLAGS, "-i", VAR_GLOBAL);
break;
case 'j': {
char *endptr;
forceJobs = TRUE;
maxJobs = strtol(optarg, &endptr, 10);
if (maxJobs <= 0 || *endptr != '\0') {
warnx("illegal number, -j argument -- %s",
optarg);
usage();
}
#ifndef REMOTE
maxLocal = maxJobs;
#endif
Var_Append(MAKEFLAGS, "-j", VAR_GLOBAL);
Var_Append(MAKEFLAGS, optarg, VAR_GLOBAL);
break;
}
case 'k':
keepgoing = TRUE;
Var_Append(MAKEFLAGS, "-k", VAR_GLOBAL);
break;
case 'm':
Dir_AddDir(sysIncPath, optarg);
Var_Append(MAKEFLAGS, "-m", VAR_GLOBAL);
Var_Append(MAKEFLAGS, optarg, VAR_GLOBAL);
break;
case 'n':
noExecute = TRUE;
Var_Append(MAKEFLAGS, "-n", VAR_GLOBAL);
break;
case 'q':
queryFlag = TRUE;
/* Kind of nonsensical, wot? */
Var_Append(MAKEFLAGS, "-q", VAR_GLOBAL);
break;
case 'r':
noBuiltins = TRUE;
Var_Append(MAKEFLAGS, "-r", VAR_GLOBAL);
break;
case 's':
beSilent = TRUE;
Var_Append(MAKEFLAGS, "-s", VAR_GLOBAL);
break;
case 't':
touchFlag = TRUE;
Var_Append(MAKEFLAGS, "-t", VAR_GLOBAL);
break;
case 'v':
beVerbose = TRUE;
Var_Append(MAKEFLAGS, "-v", VAR_GLOBAL);
break;
default:
case '?':
usage();
}
}
oldVars = TRUE;
/*
* See if the rest of the arguments are variable assignments and
* perform them if so. Else take them to be targets and stuff them
* on the end of the "create" list.
*/
for (argv += optind, argc -= optind; *argv; ++argv, --argc)
if (Parse_IsVar(*argv))
Parse_DoVar(*argv, VAR_CMD);
else {
if (!**argv)
Punt("illegal (null) argument.");
if (**argv == '-') {
if ((*argv)[1])
optind = 0; /* -flag... */
else
optind = 1; /* - */
goto rearg;
}
(void)Lst_AtEnd(create, (void *)estrdup(*argv));
}
}
/*-
* Main_ParseArgLine --
* Used by the parse module when a .MFLAGS or .MAKEFLAGS target
* is encountered and by main() when reading the .MAKEFLAGS envariable.
* Takes a line of arguments and breaks it into its
* component words and passes those words and the number of them to the
* MainParseArgs function.
* The line should have all its leading whitespace removed.
*
* Results:
* None
*
* Side Effects:
* Only those that come from the various arguments.
*/
void
Main_ParseArgLine(char *line)
{
char **argv; /* Manufactured argument vector */
int argc; /* Number of arguments in argv */
if (line == NULL)
return;
for (; *line == ' '; ++line)
continue;
if (!*line)
return;
argv = brk_string(line, &argc, TRUE);
MainParseArgs(argc, argv);
}
char *
chdir_verify_path(char *path, char *obpath)
{
struct stat sb;
if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) {
warn("warning: %s", path);
return 0;
}
return obpath;
}
return 0;
}
void
catch_child(int sig)
{
}
/*-
* main --
* The main function, for obvious reasons. Initializes variables
* and a few modules, then parses the arguments give it in the
* environment and on the command line. Reads the system makefile
* followed by either Makefile, makefile or the file given by the
* -f argument. Sets the .MAKEFLAGS PMake variable based on all the
* flags it has received by then uses either the Make or the Compat
* module to create the initial list of targets.
*
* Results:
* If -q was given, exits -1 if anything was out-of-date. Else it exits
* 0.
*
* Side Effects:
* The program exits when done. Targets are created. etc. etc. etc.
*/
int
main(int argc, char **argv)
{
Lst targs; /* target nodes to create -- passed to Make_Init */
Boolean outOfDate = TRUE; /* FALSE if all targets up to date */
struct stat sa;
char *p, *p1, *path, *pathp;
#ifdef WANT_ENV_MKLVL
#define MKLVL_MAXVAL 500
#define MKLVL_ENVVAR "__MKLVL__"
int iMkLvl = 0;
char *szMkLvl = getenv(MKLVL_ENVVAR);
#endif /* WANT_ENV_MKLVL */
char mdpath[MAXPATHLEN];
char obpath[MAXPATHLEN];
char cdpath[MAXPATHLEN];
char *machine = getenv("MACHINE");
char *machine_arch = getenv("MACHINE_ARCH");
char *machine_cpu = getenv("MACHINE_CPU");
Lst sysMkPath; /* Path of sys.mk */
char *cp = NULL, *start;
/* avoid faults on read-only strings */
static char syspath[] = _PATH_DEFSYSPATH;
{
/*
* Catch SIGCHLD so that we get kicked out of select() when we
* need to look at a child. This is only known to matter for the
* -j case (perhaps without -P).
*
* XXX this is intentionally misplaced.
*/
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
sa.sa_handler = catch_child;
sigaction(SIGCHLD, &sa, NULL);
}
#ifdef WANT_ENV_MKLVL
if ((iMkLvl = szMkLvl ? atoi(szMkLvl) : 0) < 0) {
iMkLvl = 0;
}
if (iMkLvl++ > MKLVL_MAXVAL) {
errc(2, EAGAIN,
"Max recursion level (%d) exceeded.", MKLVL_MAXVAL);
}
bzero(szMkLvl = emalloc(32), 32);
sprintf(szMkLvl, "%d", iMkLvl);
setenv(MKLVL_ENVVAR, szMkLvl, 1);
#endif /* WANT_ENV_MKLVL */
#if DEFSHELL == 2
/*
* Turn off ENV to make ksh happier.
*/
unsetenv("ENV");
#endif
#ifdef RLIMIT_NOFILE
/*
* get rid of resource limit on file descriptors
*/
{
struct rlimit rl;
if (getrlimit(RLIMIT_NOFILE, &rl) != -1 &&
rl.rlim_cur != rl.rlim_max) {
rl.rlim_cur = rl.rlim_max;
(void) setrlimit(RLIMIT_NOFILE, &rl);
}
}
#endif
/*
* PC-98 kernel sets the `i386' string to the utsname.machine and
* it cannot be distinguished from IBM-PC by uname(3). Therefore,
* we check machine.ispc98 and adjust the machine variable before
* using usname(3) below.
* NOTE: machdep.ispc98 was defined on 1998/8/31. At that time,
* __FreeBSD_version was defined as 300003. So, this check can
* safely be done with any kernel with version > 300003.
*/
if (!machine) {
int ispc98;
size_t len;
len = sizeof(ispc98);
if (!sysctlbyname("machdep.ispc98", &ispc98, &len, NULL, 0)) {
if (ispc98)
machine = "pc98";
}
}
/*
* Get the name of this type of MACHINE from utsname
* so we can share an executable for similar machines.
* (i.e. m68k: amiga hp300, mac68k, sun3, ...)
*
* Note that while MACHINE is decided at run-time,
* MACHINE_ARCH is always known at compile time.
*/
if (!machine) {
#ifndef MACHINE
struct utsname utsname;
if (uname(&utsname) == -1)
err(2, "uname");
machine = utsname.machine;
#else
machine = MACHINE;
#endif
}
if (!machine_arch) {
#ifndef MACHINE_ARCH
machine_arch = "unknown";
#else
machine_arch = MACHINE_ARCH;
#endif
}
/*
* Set machine_cpu to the minumum supported CPU revision based
* on the target architecture, if not already set.
*/
if (!machine_cpu) {
if (!strcmp(machine_arch, "i386"))
machine_cpu = "i386";
else if (!strcmp(machine_arch, "alpha"))
machine_cpu = "ev4";
else
machine_cpu = "unknown";
}
create = Lst_Init(FALSE);
makefiles = Lst_Init(FALSE);
envFirstVars = Lst_Init(FALSE);
expandVars = TRUE;
variables = Lst_Init(FALSE);
beSilent = FALSE; /* Print commands as executed */
ignoreErrors = FALSE; /* Pay attention to non-zero returns */
noExecute = FALSE; /* Execute all commands */
keepgoing = FALSE; /* Stop on error */
allPrecious = FALSE; /* Remove targets when interrupted */
queryFlag = FALSE; /* This is not just a check-run */
noBuiltins = FALSE; /* Read the built-in rules */
touchFlag = FALSE; /* Actually update targets */
usePipes = TRUE; /* Catch child output in pipes */
debug = 0; /* No debug verbosity, please. */
jobsRunning = FALSE;
maxLocal = DEFMAXLOCAL; /* Set default local max concurrency */
#ifdef REMOTE
maxJobs = DEFMAXJOBS; /* Set default max concurrency */
#else
maxJobs = maxLocal;
#endif
forceJobs = FALSE; /* No -j flag */
compatMake = FALSE; /* No compat mode */
/*
* Initialize the parsing, directory and variable modules to prepare
* for the reading of inclusion paths and variable settings on the
* command line
*/
Dir_Init(); /* Initialize directory structures so -I flags
* can be processed correctly */
Parse_Init(); /* Need to initialize the paths of #include
* directories */
Var_Init(); /* As well as the lists of variables for
* parsing arguments */
str_init();
/*
* Initialize various variables.
* MAKE also gets this name, for compatibility
* .MAKEFLAGS gets set to the empty string just in case.
* MFLAGS also gets initialized empty, for compatibility.
*/
Var_Set("MAKE", argv[0], VAR_GLOBAL);
Var_Set(MAKEFLAGS, "", VAR_GLOBAL);
Var_Set("MFLAGS", "", VAR_GLOBAL);
Var_Set("MACHINE", machine, VAR_GLOBAL);
Var_Set("MACHINE_ARCH", machine_arch, VAR_GLOBAL);
Var_Set("MACHINE_CPU", machine_cpu, VAR_GLOBAL);
#ifdef MAKE_VERSION
Var_Set("MAKE_VERSION", MAKE_VERSION, VAR_GLOBAL);
#endif
/*
* First snag any flags out of the MAKE environment variable.
* (Note this is *not* MAKEFLAGS since /bin/make uses that and it's
* in a different format).
*/
#ifdef POSIX
Main_ParseArgLine(getenv("MAKEFLAGS"));
#else
Main_ParseArgLine(getenv("MAKE"));
#endif
MainParseArgs(argc, argv);
/*
* Find where we are...
* All this code is so that we know where we are when we start up
* on a different machine with pmake.
*/
curdir = cdpath;
if (getcwd(curdir, MAXPATHLEN) == NULL)
err(2, NULL);
if (stat(curdir, &sa) == -1)
err(2, "%s", curdir);
/*
* The object directory location is determined using the
* following order of preference:
*
* 1. MAKEOBJDIRPREFIX`cwd`
* 2. MAKEOBJDIR
* 3. _PATH_OBJDIR.${MACHINE}
* 4. _PATH_OBJDIR
* 5. _PATH_OBJDIRPREFIX`cwd`
*
* If one of the first two fails, use the current directory.
* If the remaining three all fail, use the current directory.
*
* Once things are initted,
* have to add the original directory to the search path,
* and modify the paths for the Makefiles apropriately. The
* current directory is also placed as a variable for make scripts.
*/
if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) {
if (!(path = getenv("MAKEOBJDIR"))) {
path = _PATH_OBJDIR;
pathp = _PATH_OBJDIRPREFIX;
(void) snprintf(mdpath, MAXPATHLEN, "%s.%s",
path, machine);
if (!(objdir = chdir_verify_path(mdpath, obpath)))
if (!(objdir=chdir_verify_path(path, obpath))) {
(void) snprintf(mdpath, MAXPATHLEN,
"%s%s", pathp, curdir);
if (!(objdir=chdir_verify_path(mdpath,
obpath)))
objdir = curdir;
}
}
else if (!(objdir = chdir_verify_path(path, obpath)))
objdir = curdir;
}
else {
(void) snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir);
if (!(objdir = chdir_verify_path(mdpath, obpath)))
objdir = curdir;
}
Dir_InitDot(); /* Initialize the "." directory */
if (objdir != curdir)
Dir_AddDir(dirSearchPath, curdir);
Var_Set(".CURDIR", curdir, VAR_GLOBAL);
Var_Set(".OBJDIR", objdir, VAR_GLOBAL);
/*
* Be compatible if user did not specify -j and did not explicitly
* turned compatibility on
*/
if (!compatMake && !forceJobs)
compatMake = TRUE;
/*
* Initialize archive, target and suffix modules in preparation for
* parsing the makefile(s)
*/
Arch_Init();
Targ_Init();
Suff_Init();
DEFAULT = NULL;
(void)time(&now);
/*
* Set up the .TARGETS variable to contain the list of targets to be
* created. If none specified, make the variable empty -- the parser
* will fill the thing in with the default or .MAIN target.
*/
if (!Lst_IsEmpty(create)) {
LstNode ln;
for (ln = Lst_First(create); ln != NULL;
ln = Lst_Succ(ln)) {
char *name = (char *)Lst_Datum(ln);
Var_Append(".TARGETS", name, VAR_GLOBAL);
}
} else
Var_Set(".TARGETS", "", VAR_GLOBAL);
/*
* If no user-supplied system path was given (through the -m option)
* add the directories from the DEFSYSPATH (more than one may be given
* as dir1:...:dirn) to the system include path.
*/
if (Lst_IsEmpty(sysIncPath)) {
for (start = syspath; *start != '\0'; start = cp) {
for (cp = start; *cp != '\0' && *cp != ':'; cp++)
continue;
if (*cp == '\0') {
Dir_AddDir(sysIncPath, start);
} else {
*cp++ = '\0';
Dir_AddDir(sysIncPath, start);
}
}
}
/*
* Read in the built-in rules first, followed by the specified
* makefile, if it was (makefile != (char *) NULL), or the default
* Makefile and makefile, in that order, if it wasn't.
*/
if (!noBuiltins) {
LstNode ln;
sysMkPath = Lst_Init (FALSE);
Dir_Expand (_PATH_DEFSYSMK, sysIncPath, sysMkPath);
if (Lst_IsEmpty(sysMkPath))
Fatal("make: no system rules (%s).", _PATH_DEFSYSMK);
ln = Lst_Find(sysMkPath, (void *)NULL, ReadMakefile);
if (ln != NULL)
Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
}
if (!Lst_IsEmpty(makefiles)) {
LstNode ln;
ln = Lst_Find(makefiles, (void *)NULL, ReadMakefile);
if (ln != NULL)
Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
} else if (!ReadMakefile("BSDmakefile", NULL))
if (!ReadMakefile("makefile", NULL))
(void)ReadMakefile("Makefile", NULL);
(void)ReadMakefile(".depend", NULL);
Var_Append("MFLAGS", Var_Value(MAKEFLAGS, VAR_GLOBAL, &p1), VAR_GLOBAL);
free(p1);
/* Install all the flags into the MAKE envariable. */
if (((p = Var_Value(MAKEFLAGS, VAR_GLOBAL, &p1)) != NULL) && *p)
#ifdef POSIX
setenv("MAKEFLAGS", p, 1);
#else
setenv("MAKE", p, 1);
#endif
free(p1);
/*
* For compatibility, look at the directories in the VPATH variable
* and add them to the search path, if the variable is defined. The
* variable's value is in the same format as the PATH envariable, i.e.
* <directory>:<directory>:<directory>...
*/
if (Var_Exists("VPATH", VAR_CMD)) {
char *vpath, savec;
/*
* GCC stores string constants in read-only memory, but
* Var_Subst will want to write this thing, so store it
* in an array
*/
static char VPATH[] = "${VPATH}";
vpath = Var_Subst(NULL, VPATH, VAR_CMD, FALSE);
path = vpath;
do {
/* skip to end of directory */
for (cp = path; *cp != ':' && *cp != '\0'; cp++)
continue;
/* Save terminator character so know when to stop */
savec = *cp;
*cp = '\0';
/* Add directory to search path */
Dir_AddDir(dirSearchPath, path);
*cp = savec;
path = cp + 1;
} while (savec == ':');
(void)free(vpath);
}
/*
* Now that all search paths have been read for suffixes et al, it's
* time to add the default search path to their lists...
*/
Suff_DoPaths();
/* print the initial graph, if the user requested it */
if (DEBUG(GRAPH1))
Targ_PrintGraph(1);
/* print the values of any variables requested by the user */
if (!Lst_IsEmpty(variables)) {
LstNode ln;
for (ln = Lst_First(variables); ln != NULL;
ln = Lst_Succ(ln)) {
char *value;
if (expandVars) {
p1 = emalloc(strlen((char *)Lst_Datum(ln)) + 1 + 3);
/* This sprintf is safe, because of the malloc above */
(void)sprintf(p1, "${%s}", (char *)Lst_Datum(ln));
value = Var_Subst(NULL, p1, VAR_GLOBAL, FALSE);
} else {
value = Var_Value((char *)Lst_Datum(ln),
VAR_GLOBAL, &p1);
}
printf("%s\n", value ? value : "");
if (p1)
free(p1);
}
} else {
/*
* Have now read the entire graph and need to make a list of targets
* to create. If none was given on the command line, we consult the
* parsing module to find the main target(s) to create.
*/
if (Lst_IsEmpty(create))
targs = Parse_MainName();
else
targs = Targ_FindList(create, TARG_CREATE);
if (!compatMake) {
/*
* Initialize job module before traversing the graph, now that
* any .BEGIN and .END targets have been read. This is done
* only if the -q flag wasn't given (to prevent the .BEGIN from
* being executed should it exist).
*/
if (!queryFlag) {
if (maxLocal == -1)
maxLocal = maxJobs;
Job_Init(maxJobs, maxLocal);
jobsRunning = TRUE;
}
/* Traverse the graph, checking on all the targets */
outOfDate = Make_Run(targs);
} else {
/*
* Compat_Init will take care of creating all the targets as
* well as initializing the module.
*/
Compat_Run(targs);
outOfDate = 0;
}
Lst_Destroy(targs, NOFREE);
}
Lst_Destroy(variables, NOFREE);
Lst_Destroy(makefiles, NOFREE);
Lst_Destroy(create, (void (*)(void *)) free);
/* print the graph now it's been processed if the user requested it */
if (DEBUG(GRAPH2))
Targ_PrintGraph(2);
Suff_End();
Targ_End();
Arch_End();
str_end();
Var_End();
Parse_End();
Dir_End();
if (queryFlag && outOfDate)
return(1);
else
return(0);
}
/*-
* ReadMakefile --
* Open and parse the given makefile.
*
* Results:
* TRUE if ok. FALSE if couldn't open file.
*
* Side Effects:
* lots
*/
static Boolean
ReadMakefile(void *p, void *q __unused)
{
char *fname; /* makefile to read */
FILE *stream;
char *name, path[MAXPATHLEN];
char *MAKEFILE;
int setMAKEFILE;
fname = p;
if (!strcmp(fname, "-")) {
Parse_File("(stdin)", stdin);
Var_Set("MAKEFILE", "", VAR_GLOBAL);
} else {
setMAKEFILE = strcmp(fname, ".depend");
/* if we've chdir'd, rebuild the path name */
if (curdir != objdir && *fname != '/') {
(void)snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname);
/*
* XXX The realpath stuff breaks relative includes
* XXX in some cases. The problem likely is in
* XXX parse.c where it does special things in
* XXX ParseDoInclude if the file is relateive
* XXX or absolute and not a system file. There
* XXX it assumes that if the current file that's
* XXX being included is absolute, that any files
* XXX that it includes shouldn't do the -I path
* XXX stuff, which is inconsistant with historical
* XXX behavior. However, I can't pentrate the mists
* XXX further, so I'm putting this workaround in
* XXX here until such time as the underlying bug
* XXX can be fixed.
*/
#if THIS_BREAKS_THINGS
if (realpath(path, path) != NULL &&
(stream = fopen(path, "r")) != NULL) {
MAKEFILE = fname;
fname = path;
goto found;
}
} else if (realpath(fname, path) != NULL) {
MAKEFILE = fname;
fname = path;
if ((stream = fopen(fname, "r")) != NULL)
goto found;
}
#else
if ((stream = fopen(path, "r")) != NULL) {
MAKEFILE = fname;
fname = path;
goto found;
}
} else {
MAKEFILE = fname;
if ((stream = fopen(fname, "r")) != NULL)
goto found;
}
#endif
/* look in -I and system include directories. */
name = Dir_FindFile(fname, parseIncPath);
if (!name)
name = Dir_FindFile(fname, sysIncPath);
if (!name || !(stream = fopen(name, "r")))
return(FALSE);
MAKEFILE = fname = name;
/*
* set the MAKEFILE variable desired by System V fans -- the
* placement of the setting here means it gets set to the last
* makefile specified, as it is set by SysV make.
*/
found:
if (setMAKEFILE)
Var_Set("MAKEFILE", MAKEFILE, VAR_GLOBAL);
Parse_File(fname, stream);
(void)fclose(stream);
}
return(TRUE);
}
/*-
* Cmd_Exec --
* Execute the command in cmd, and return the output of that command
* in a string.
*
* Results:
* A string containing the output of the command, or the empty string
* If error is not NULL, it contains the reason for the command failure
*
* Side Effects:
* The string must be freed by the caller.
*/
char *
Cmd_Exec(char *cmd, char **error)
{
char *args[4]; /* Args for invoking the shell */
int fds[2]; /* Pipe streams */
int cpid; /* Child PID */
int pid; /* PID from wait() */
char *res; /* result */
int status; /* command exit status */
Buffer buf; /* buffer to store the result */
char *cp;
int cc;
*error = NULL;
/*
* Set up arguments for shell
*/
args[0] = "sh";
args[1] = "-c";
args[2] = cmd;
args[3] = NULL;
/*
* Open a pipe for fetching its output
*/
if (pipe(fds) == -1) {
*error = "Couldn't create pipe for \"%s\"";
goto bad;
}
/*
* Fork
*/
switch (cpid = vfork()) {
case 0:
/*
* Close input side of pipe
*/
(void) close(fds[0]);
/*
* Duplicate the output stream to the shell's output, then
* shut the extra thing down. Note we don't fetch the error
* stream...why not? Why?
*/
(void) dup2(fds[1], 1);
(void) close(fds[1]);
#if defined(DEFSHELL) && DEFSHELL == 0
(void) execv("/bin/csh", args);
#elif DEFSHELL == 1
(void) execv("/bin/sh", args);
#elif DEFSHELL == 2
(void) execv("/bin/ksh", args);
#else
#error "DEFSHELL must be 1 or 2."
#endif
_exit(1);
/*NOTREACHED*/
case -1:
*error = "Couldn't exec \"%s\"";
goto bad;
default:
/*
* No need for the writing half
*/
(void) close(fds[1]);
buf = Buf_Init (MAKE_BSIZE);
do {
char result[BUFSIZ];
cc = read(fds[0], result, sizeof(result));
if (cc > 0)
Buf_AddBytes(buf, cc, (Byte *) result);
}
while (cc > 0 || (cc == -1 && errno == EINTR));
/*
* Close the input side of the pipe.
*/
(void) close(fds[0]);
/*
* Wait for the process to exit.
*/
while(((pid = wait(&status)) != cpid) && (pid >= 0))
continue;
if (cc == -1)
*error = "Error reading shell's output for \"%s\"";
res = (char *)Buf_GetAll (buf, &cc);
Buf_Destroy (buf, FALSE);
if (status)
*error = "\"%s\" returned non-zero status";
/*
* Null-terminate the result, convert newlines to spaces and
* install it in the variable.
*/
res[cc] = '\0';
cp = &res[cc] - 1;
if (*cp == '\n') {
/*
* A final newline is just stripped
*/
*cp-- = '\0';
}
while (cp >= res) {
if (*cp == '\n') {
*cp = ' ';
}
cp--;
}
break;
}
return res;
bad:
res = emalloc(1);
*res = '\0';
return res;
}
/*
* usage --
* exit with usage message
*/
static void
usage(void)
{
(void)fprintf(stderr, "%s\n%s\n%s\n",
"usage: make [-BPSXeiknqrstv] [-C directory] [-D variable] [-d flags]",
" [-E variable] [-f makefile] [-I directory] [-j max_jobs]",
" [-m directory] [-V variable] [variable=value] [target ...]");
exit(2);
}
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