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|
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// These #ifdefs are being used as a substitute for
// build configuration, so that on any system, this
// tool can be built with the local equivalent of
// cc *.c
//
#ifndef WIN32
#ifndef PLAN9
#include "a.h"
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <sys/utsname.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <stdarg.h>
// bprintf replaces the buffer with the result of the printf formatting
// and returns a pointer to the NUL-terminated buffer contents.
char*
bprintf(Buf *b, char *fmt, ...)
{
va_list arg;
char buf[4096];
breset(b);
va_start(arg, fmt);
vsnprintf(buf, sizeof buf, fmt, arg);
va_end(arg);
bwritestr(b, buf);
return bstr(b);
}
// bpathf is the same as bprintf (on windows it turns / into \ after the printf).
// It returns a pointer to the NUL-terminated buffer contents.
char*
bpathf(Buf *b, char *fmt, ...)
{
va_list arg;
char buf[4096];
breset(b);
va_start(arg, fmt);
vsnprintf(buf, sizeof buf, fmt, arg);
va_end(arg);
bwritestr(b, buf);
return bstr(b);
}
// bwritef is like bprintf but does not reset the buffer
// and does not return the NUL-terminated string.
void
bwritef(Buf *b, char *fmt, ...)
{
va_list arg;
char buf[4096];
va_start(arg, fmt);
vsnprintf(buf, sizeof buf, fmt, arg);
va_end(arg);
bwritestr(b, buf);
}
// breadfrom appends to b all the data that can be read from fd.
static void
breadfrom(Buf *b, int fd)
{
int n;
for(;;) {
bgrow(b, 4096);
n = read(fd, b->p+b->len, 4096);
if(n < 0)
fatal("read: %s", strerror(errno));
if(n == 0)
break;
b->len += n;
}
}
// xgetenv replaces b with the value of the named environment variable.
void
xgetenv(Buf *b, char *name)
{
char *p;
breset(b);
p = getenv(name);
if(p != NULL)
bwritestr(b, p);
}
static void genrun(Buf *b, char *dir, int mode, Vec *argv, int bg);
// run runs the command named by cmd.
// If b is not nil, run replaces b with the output of the command.
// If dir is not nil, run runs the command in that directory.
// If mode is CheckExit, run calls fatal if the command is not successful.
void
run(Buf *b, char *dir, int mode, char *cmd, ...)
{
va_list arg;
Vec argv;
char *p;
vinit(&argv);
vadd(&argv, cmd);
va_start(arg, cmd);
while((p = va_arg(arg, char*)) != nil)
vadd(&argv, p);
va_end(arg);
runv(b, dir, mode, &argv);
vfree(&argv);
}
// runv is like run but takes a vector.
void
runv(Buf *b, char *dir, int mode, Vec *argv)
{
genrun(b, dir, mode, argv, 1);
}
// bgrunv is like run but runs the command in the background.
// bgwait waits for pending bgrunv to finish.
void
bgrunv(char *dir, int mode, Vec *argv)
{
genrun(nil, dir, mode, argv, 0);
}
#define MAXBG 4 /* maximum number of jobs to run at once */
static struct {
int pid;
int mode;
char *cmd;
Buf *b;
} bg[MAXBG];
static int nbg;
static int maxnbg = nelem(bg);
static void bgwait1(void);
// genrun is the generic run implementation.
static void
genrun(Buf *b, char *dir, int mode, Vec *argv, int wait)
{
int i, p[2], pid;
Buf cmd;
char *q;
while(nbg >= maxnbg)
bgwait1();
// Generate a copy of the command to show in a log.
// Substitute $WORK for the work directory.
binit(&cmd);
for(i=0; i<argv->len; i++) {
if(i > 0)
bwritestr(&cmd, " ");
q = argv->p[i];
if(workdir != nil && hasprefix(q, workdir)) {
bwritestr(&cmd, "$WORK");
q += strlen(workdir);
}
bwritestr(&cmd, q);
}
if(vflag > 1)
xprintf("%s\n", bstr(&cmd));
if(b != nil) {
breset(b);
if(pipe(p) < 0)
fatal("pipe: %s", strerror(errno));
}
switch(pid = fork()) {
case -1:
fatal("fork: %s", strerror(errno));
case 0:
if(b != nil) {
close(0);
close(p[0]);
dup2(p[1], 1);
dup2(p[1], 2);
if(p[1] > 2)
close(p[1]);
}
if(dir != nil) {
if(chdir(dir) < 0) {
fprintf(stderr, "chdir %s: %s\n", dir, strerror(errno));
_exit(1);
}
}
vadd(argv, nil);
execvp(argv->p[0], argv->p);
fprintf(stderr, "%s\n", bstr(&cmd));
fprintf(stderr, "exec %s: %s\n", argv->p[0], strerror(errno));
_exit(1);
}
if(b != nil) {
close(p[1]);
breadfrom(b, p[0]);
close(p[0]);
}
if(nbg < 0)
fatal("bad bookkeeping");
bg[nbg].pid = pid;
bg[nbg].mode = mode;
bg[nbg].cmd = btake(&cmd);
bg[nbg].b = b;
nbg++;
if(wait)
bgwait();
bfree(&cmd);
}
// bgwait1 waits for a single background job.
static void
bgwait1(void)
{
int i, pid, status, mode;
char *cmd;
Buf *b;
errno = 0;
while((pid = wait(&status)) < 0) {
if(errno != EINTR)
fatal("waitpid: %s", strerror(errno));
}
for(i=0; i<nbg; i++)
if(bg[i].pid == pid)
goto ok;
fatal("waitpid: unexpected pid");
ok:
cmd = bg[i].cmd;
mode = bg[i].mode;
bg[i].pid = 0;
b = bg[i].b;
bg[i].b = nil;
bg[i] = bg[--nbg];
if(mode == CheckExit && (!WIFEXITED(status) || WEXITSTATUS(status) != 0)) {
if(b != nil)
xprintf("%s\n", bstr(b));
fatal("FAILED: %s", cmd);
}
xfree(cmd);
}
// bgwait waits for all the background jobs.
void
bgwait(void)
{
while(nbg > 0)
bgwait1();
}
// xgetwd replaces b with the current directory.
void
xgetwd(Buf *b)
{
char buf[MAXPATHLEN];
breset(b);
if(getcwd(buf, MAXPATHLEN) == nil)
fatal("getcwd: %s", strerror(errno));
bwritestr(b, buf);
}
// xrealwd replaces b with the 'real' name for the given path.
// real is defined as what getcwd returns in that directory.
void
xrealwd(Buf *b, char *path)
{
int fd;
fd = open(".", 0);
if(fd < 0)
fatal("open .: %s", strerror(errno));
if(chdir(path) < 0)
fatal("chdir %s: %s", path, strerror(errno));
xgetwd(b);
if(fchdir(fd) < 0)
fatal("fchdir: %s", strerror(errno));
close(fd);
}
// isdir reports whether p names an existing directory.
bool
isdir(char *p)
{
struct stat st;
return stat(p, &st) >= 0 && S_ISDIR(st.st_mode);
}
// isfile reports whether p names an existing file.
bool
isfile(char *p)
{
struct stat st;
return stat(p, &st) >= 0 && S_ISREG(st.st_mode);
}
// mtime returns the modification time of the file p.
Time
mtime(char *p)
{
struct stat st;
if(stat(p, &st) < 0)
return 0;
return (Time)st.st_mtime*1000000000LL;
}
// isabs reports whether p is an absolute path.
bool
isabs(char *p)
{
return hasprefix(p, "/");
}
// readfile replaces b with the content of the named file.
void
readfile(Buf *b, char *file)
{
int fd;
breset(b);
fd = open(file, 0);
if(fd < 0)
fatal("open %s: %s", file, strerror(errno));
breadfrom(b, fd);
close(fd);
}
// writefile writes b to the named file, creating it if needed. if
// exec is non-zero, marks the file as executable.
void
writefile(Buf *b, char *file, int exec)
{
int fd;
fd = creat(file, 0666);
if(fd < 0)
fatal("create %s: %s", file, strerror(errno));
if(write(fd, b->p, b->len) != b->len)
fatal("short write: %s", strerror(errno));
if(exec)
fchmod(fd, 0755);
close(fd);
}
// xmkdir creates the directory p.
void
xmkdir(char *p)
{
if(mkdir(p, 0777) < 0)
fatal("mkdir %s: %s", p, strerror(errno));
}
// xmkdirall creates the directory p and its parents, as needed.
void
xmkdirall(char *p)
{
char *q;
if(isdir(p))
return;
q = strrchr(p, '/');
if(q != nil) {
*q = '\0';
xmkdirall(p);
*q = '/';
}
xmkdir(p);
}
// xremove removes the file p.
void
xremove(char *p)
{
if(vflag > 2)
xprintf("rm %s\n", p);
unlink(p);
}
// xremoveall removes the file or directory tree rooted at p.
void
xremoveall(char *p)
{
int i;
Buf b;
Vec dir;
binit(&b);
vinit(&dir);
if(isdir(p)) {
xreaddir(&dir, p);
for(i=0; i<dir.len; i++) {
bprintf(&b, "%s/%s", p, dir.p[i]);
xremoveall(bstr(&b));
}
if(vflag > 2)
xprintf("rm %s\n", p);
rmdir(p);
} else {
if(vflag > 2)
xprintf("rm %s\n", p);
unlink(p);
}
bfree(&b);
vfree(&dir);
}
// xreaddir replaces dst with a list of the names of the files in dir.
// The names are relative to dir; they are not full paths.
void
xreaddir(Vec *dst, char *dir)
{
DIR *d;
struct dirent *dp;
vreset(dst);
d = opendir(dir);
if(d == nil)
fatal("opendir %s: %s", dir, strerror(errno));
while((dp = readdir(d)) != nil) {
if(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0)
continue;
vadd(dst, dp->d_name);
}
closedir(d);
}
// xworkdir creates a new temporary directory to hold object files
// and returns the name of that directory.
char*
xworkdir(void)
{
Buf b;
char *p;
binit(&b);
xgetenv(&b, "TMPDIR");
if(b.len == 0)
bwritestr(&b, "/var/tmp");
bwritestr(&b, "/go-cbuild-XXXXXX");
if(mkdtemp(bstr(&b)) == nil)
fatal("mkdtemp: %s", strerror(errno));
p = btake(&b);
bfree(&b);
return p;
}
// fatal prints an error message to standard error and exits.
void
fatal(char *msg, ...)
{
va_list arg;
fflush(stdout);
fprintf(stderr, "go tool dist: ");
va_start(arg, msg);
vfprintf(stderr, msg, arg);
va_end(arg);
fprintf(stderr, "\n");
bgwait();
exit(1);
}
// xmalloc returns a newly allocated zeroed block of n bytes of memory.
// It calls fatal if it runs out of memory.
void*
xmalloc(int n)
{
void *p;
p = malloc(n);
if(p == nil)
fatal("out of memory");
memset(p, 0, n);
return p;
}
// xstrdup returns a newly allocated copy of p.
// It calls fatal if it runs out of memory.
char*
xstrdup(char *p)
{
p = strdup(p);
if(p == nil)
fatal("out of memory");
return p;
}
// xrealloc grows the allocation p to n bytes and
// returns the new (possibly moved) pointer.
// It calls fatal if it runs out of memory.
void*
xrealloc(void *p, int n)
{
p = realloc(p, n);
if(p == nil)
fatal("out of memory");
return p;
}
// xfree frees the result returned by xmalloc, xstrdup, or xrealloc.
void
xfree(void *p)
{
free(p);
}
// hassuffix reports whether p ends with suffix.
bool
hassuffix(char *p, char *suffix)
{
int np, ns;
np = strlen(p);
ns = strlen(suffix);
return np >= ns && strcmp(p+np-ns, suffix) == 0;
}
// hasprefix reports whether p begins wtih prefix.
bool
hasprefix(char *p, char *prefix)
{
return strncmp(p, prefix, strlen(prefix)) == 0;
}
// contains reports whether sep appears in p.
bool
contains(char *p, char *sep)
{
return strstr(p, sep) != nil;
}
// streq reports whether p and q are the same string.
bool
streq(char *p, char *q)
{
return strcmp(p, q) == 0;
}
// lastelem returns the final path element in p.
char*
lastelem(char *p)
{
char *out;
out = p;
for(; *p; p++)
if(*p == '/')
out = p+1;
return out;
}
// xmemmove copies n bytes from src to dst.
void
xmemmove(void *dst, void *src, int n)
{
memmove(dst, src, n);
}
// xmemcmp compares the n-byte regions starting at a and at b.
int
xmemcmp(void *a, void *b, int n)
{
return memcmp(a, b, n);
}
// xstrlen returns the length of the NUL-terminated string at p.
int
xstrlen(char *p)
{
return strlen(p);
}
// xexit exits the process with return code n.
void
xexit(int n)
{
exit(n);
}
// xatexit schedules the exit-handler f to be run when the program exits.
void
xatexit(void (*f)(void))
{
atexit(f);
}
// xprintf prints a message to standard output.
void
xprintf(char *fmt, ...)
{
va_list arg;
va_start(arg, fmt);
vprintf(fmt, arg);
va_end(arg);
}
// xsetenv sets the environment variable $name to the given value.
void
xsetenv(char *name, char *value)
{
setenv(name, value, 1);
}
// main takes care of OS-specific startup and dispatches to xmain.
int
main(int argc, char **argv)
{
Buf b;
struct utsname u;
setvbuf(stdout, nil, _IOLBF, 0);
setvbuf(stderr, nil, _IOLBF, 0);
binit(&b);
slash = "/";
#if defined(__APPLE__)
gohostos = "darwin";
// Even on 64-bit platform, darwin uname -m prints i386.
run(&b, nil, 0, "sysctl", "machdep.cpu.extfeatures", nil);
if(contains(bstr(&b), "EM64T"))
gohostarch = "amd64";
#elif defined(__linux__)
gohostos = "linux";
#elif defined(__FreeBSD__)
gohostos = "freebsd";
#elif defined(__OpenBSD__)
gohostos = "openbsd";
#elif defined(__NetBSD__)
gohostos = "netbsd";
#else
fatal("unknown operating system");
#endif
if(gohostarch == nil) {
if(uname(&u) < 0)
fatal("uname: %s", strerror(errno));
if(contains(u.machine, "x86_64") || contains(u.machine, "amd64"))
gohostarch = "amd64";
else if(hassuffix(u.machine, "86"))
gohostarch = "386";
else if(contains(u.machine, "arm"))
gohostarch = "arm";
else
fatal("unknown architecture: %s", u.machine);
}
if(strcmp(gohostarch, "arm") == 0)
maxnbg = 1;
init();
xmain(argc, argv);
bfree(&b);
return 0;
}
// xqsort is a wrapper for the C standard qsort.
void
xqsort(void *data, int n, int elemsize, int (*cmp)(const void*, const void*))
{
qsort(data, n, elemsize, cmp);
}
// xstrcmp compares the NUL-terminated strings a and b.
int
xstrcmp(char *a, char *b)
{
return strcmp(a, b);
}
// xstrstr returns a pointer to the first occurrence of b in a.
char*
xstrstr(char *a, char *b)
{
return strstr(a, b);
}
// xstrrchr returns a pointer to the final occurrence of c in p.
char*
xstrrchr(char *p, int c)
{
return strrchr(p, c);
}
#endif // PLAN9
#endif // __WINDOWS__
|