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|
/* -*- c-file-style: "java"; indent-tabs-mode: nil; tab-width: 4; fill-column: 78 -*-
*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2002, 2003 by Martin Pool <mbp@samba.org>
* Copyright 2007 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <config.h>
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <netdb.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/time.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef HAVE_SYS_LOADAVG_H
#include <sys/loadavg.h>
#endif
#include <sys/param.h>
#include "distcc.h"
#include "trace.h"
#include "util.h"
#include "exitcode.h"
#include "snprintf.h"
/* I will make a man more precious than fine
* gold; even a man than the golden wedge of
* Ophir.
* -- Isaiah 13:12 */
void dcc_exit(int exitcode)
{
struct rusage self_ru, children_ru;
if (getrusage(RUSAGE_SELF, &self_ru)) {
rs_log_warning("getrusage(RUSAGE_SELF) failed: %s", strerror(errno));
memset(&self_ru, 0, sizeof self_ru);
}
if (getrusage(RUSAGE_CHILDREN, &children_ru)) {
rs_log_warning("getrusage(RUSAGE_CHILDREN) failed: %s", strerror(errno));
memset(&children_ru, 0, sizeof children_ru);
}
/* NB fields must match up for microseconds */
rs_log(RS_LOG_INFO,
"exit: code %d; self: %d.%06d user %d.%06d sys; children: %d.%06d user %d.%06d sys",
exitcode,
(int) self_ru.ru_utime.tv_sec, (int) self_ru.ru_utime.tv_usec,
(int) self_ru.ru_stime.tv_sec, (int) self_ru.ru_stime.tv_usec,
(int) children_ru.ru_utime.tv_sec, (int) children_ru.ru_utime.tv_usec,
(int) children_ru.ru_stime.tv_sec, (int) children_ru.ru_stime.tv_usec);
exit(exitcode);
}
int str_endswith(const char *tail, const char *tiger)
{
size_t len_tail = strlen(tail);
size_t len_tiger = strlen(tiger);
if (len_tail > len_tiger)
return 0;
return !strcmp(tiger + len_tiger - len_tail, tail);
}
int str_startswith(const char *head, const char *worm)
{
return !strncmp(head, worm, strlen(head));
}
/**
* Skim through NULL-terminated @p argv, looking for @p s.
**/
int argv_contains(char **argv, const char *s)
{
while (*argv) {
if (!strcmp(*argv, s))
return 1;
argv++;
}
return 0;
}
/**
* Redirect a file descriptor into (or out of) a file.
*
* Used, for example, to catch compiler error messages into a
* temporary file.
**/
int dcc_redirect_fd(int fd, const char *fname, int mode)
{
int newfd;
/* ignore errors */
close(fd);
newfd = open(fname, mode, 0666);
if (newfd == -1) {
rs_log_crit("failed to reopen fd%d onto %s: %s",
fd, fname, strerror(errno));
return EXIT_IO_ERROR;
} else if (newfd != fd) {
rs_log_crit("oops, reopened fd%d onto fd%d?", fd, newfd);
return EXIT_IO_ERROR;
}
return 0;
}
char *dcc_gethostname(void)
{
static char myname[100] = "\0";
if (!myname[0]) {
if (gethostname(myname, sizeof myname - 1) == -1)
strcpy(myname, "UNKNOWN");
}
return myname;
}
/**
* Look up a boolean environment option, which must be either "0" or
* "1". The default, if it's not set or is empty, is @p default.
**/
int dcc_getenv_bool(const char *name, int default_value)
{
const char *e;
e = getenv(name);
if (!e || !*e)
return default_value;
if (!strcmp(e, "1"))
return 1;
else if (!strcmp(e, "0"))
return 0;
else
return default_value;
}
#define IS_LEGAL_DOMAIN_CHAR(c) (isalnum(c) || ((c) == '-') || ((c) == '.'))
/* Copy domain part of hostname to static buffer.
* If hostname has no domain part, returns -1.
* If domain lookup fails, returns -1.
* Otherwise places pointer to domain in *domain_name and returns 0.
*
* This should yield the same result as the linux command
* 'dnsdomainname' or 'hostname -d'.
**/
int dcc_get_dns_domain(const char **domain_name)
{
#if 0 /* Too expensive */
static char host_name[1024];
struct hostent *h;
int ret;
ret = gethostname(host_name, sizeof(host_name));
if (ret != 0)
return -1;
h = gethostbyname(host_name);
if (h == NULL) {
rs_log_error("failed to look up self \"%s\": %s", host_name,
hstrerror(h_errno));
return -1;
}
strncpy(host_name, h->h_name, sizeof(host_name));
*domain_name = strchr(h->h_name, '.');
#else /* cheaper */
const char *envh, *envh2;
int i;
const int MAXDOMAINLEN = 512;
/* Kludge for speed: Try to retrieve FQDN from environment.
* This can save many milliseconds on a network that's busy and lossy
* (glibc retries DNS operations very slowly).
*/
/* Solaris, BSD tend to put it in HOST.
* (Some flavors of Linux put the non-qualified hostname in HOST,
* so ignore this if it doesn't have a dot in it.)
*/
envh = getenv("HOST");
if (envh && !strchr(envh, '.'))
envh = NULL;
/* Some flavors of Linux put the FQDN in HOSTNAME when
* logged in interactively, but not when ssh'd in noninteractively.
* Ubuntu's bash puts it in HOSTNAME but doesn't export it!
*/
envh2 = getenv("HOSTNAME");
if (envh2 && !strchr(envh2, '.'))
envh2 = NULL;
/* Pick the 'better' of the two. Longer is usually better. */
if (envh2 && (!envh || (strlen(envh) < strlen(envh2))))
envh = envh2;
/* If the above didn't work out, fall back to the real way. */
if (!envh || !strchr(envh, '.')) {
static char host_name[1024];
struct hostent *h;
int ret;
ret = gethostname(host_name, sizeof(host_name));
if (ret != 0)
return -1;
/* If hostname has a dot in it, assume it's the DNS address */
if (!strchr(host_name, '.')) {
/* Otherwise ask DNS what our full hostname is */
h = gethostbyname(host_name);
if (h == NULL) {
rs_log_error("failed to look up self \"%s\": %s", host_name,
hstrerror(h_errno));
return -1;
}
strncpy(host_name, h->h_name, sizeof(host_name));
}
envh = host_name;
}
/* validate to avoid possible errors from bad chars or huge value */
for (i=0; envh[i] != '\0'; i++) {
if (i > MAXDOMAINLEN || !IS_LEGAL_DOMAIN_CHAR(envh[i])) {
rs_log_error("HOST/HOSTNAME present in environment but illegal: '%s'", envh);
return -1;
}
}
*domain_name = strchr(envh, '.');
#endif
if (*domain_name == NULL)
return -1;
(*domain_name)++;
/* Return 0 on success, or -1 if the domain name is illegal, e.g. empty */
return ((*domain_name)[0] == '\0') ? -1 : 0;
}
/**
* Set the `FD_CLOEXEC' flag of DESC if VALUE is nonzero,
* or clear the flag if VALUE is 0.
*
* From the GNU C Library examples.
*
* @returns 0 on success, or -1 on error with `errno' set.
**/
int set_cloexec_flag (int desc, int value)
{
int oldflags = fcntl (desc, F_GETFD, 0);
/* If reading the flags failed, return error indication now. */
if (oldflags < 0)
return oldflags;
/* Set just the flag we want to set. */
if (value != 0)
oldflags |= FD_CLOEXEC;
else
oldflags &= ~FD_CLOEXEC;
/* Store modified flag word in the descriptor. */
return fcntl (desc, F_SETFD, oldflags);
}
/**
* Ignore or unignore SIGPIPE.
*
* The server and child ignore it, because distcc code wants to see
* EPIPE errors if something goes wrong. However, for invoked
* children it is set back to the default value, because they may not
* handle the error properly.
**/
int dcc_ignore_sigpipe(int val)
{
if (signal(SIGPIPE, val ? SIG_IGN : SIG_DFL) == SIG_ERR) {
rs_log_warning("signal(SIGPIPE, %s) failed: %s",
val ? "ignore" : "default",
strerror(errno));
return EXIT_DISTCC_FAILED;
}
return 0;
}
/**
* Search through the $PATH looking for a directory containing a file called
* @p compiler_name, which is a symbolic link containing the string "distcc".
*
* Trim the path to just after the *last* such directory.
*
* If we find a distcc masquerade dir on the PATH, remove all the dirs up
* to that point.
**/
int dcc_trim_path(const char *compiler_name)
{
const char *envpath, *newpath, *p, *n;
char linkbuf[MAXPATHLEN], *buf;
struct stat sb;
size_t len;
if (!(envpath = getenv("PATH"))) {
rs_trace("PATH seems not to be defined");
return 0;
}
rs_trace("original PATH %s", envpath);
rs_trace("looking for \"%s\"", compiler_name);
/* Allocate a buffer that will let us append "/cc" onto any PATH
* element, even if there is only one item in the PATH. */
if (!(buf = malloc(strlen(envpath)+1+strlen(compiler_name)+1))) {
rs_log_error("failed to allocate buffer for PATH munging");
return EXIT_OUT_OF_MEMORY;
}
for (n = p = envpath, newpath = NULL; *n; p = n) {
n = strchr(p, ':');
if (n)
len = n++ - p;
else {
len = strlen(p);
n = p + len;
}
strncpy(buf, p, len);
sprintf(buf + len, "/%s", compiler_name);
if (lstat(buf, &sb) == -1)
continue; /* ENOENT, EACCESS, etc */
if (!S_ISLNK(sb.st_mode))
break;
if ((len = readlink(buf, linkbuf, sizeof linkbuf)) <= 0)
continue;
linkbuf[len] = '\0';
if (strstr(linkbuf, "distcc")) {
/* Set newpath to the part of the PATH past our match. */
newpath = n;
}
}
if (newpath) {
int ret = dcc_set_path(newpath);
if (ret)
return ret;
} else
rs_trace("not modifying PATH");
free(buf);
return 0;
}
/* Set the PATH environment variable to the indicated value. */
int dcc_set_path(const char *newpath)
{
char *buf;
if (asprintf(&buf, "PATH=%s", newpath) <= 0 || !buf) {
rs_log_error("failed to allocate buffer for new PATH");
return EXIT_OUT_OF_MEMORY;
}
rs_trace("setting %s", buf);
if (putenv(buf) < 0) {
rs_log_error("putenv PATH failed");
return EXIT_FAILURE;
}
/* We must leave "buf" allocated. */
return 0;
}
/* Return the supplied path with the current-working directory prefixed (if
* needed) and all "dir/.." references removed. Supply path_len if you want
* to use only a substring of the path string, otherwise make it 0. */
char *dcc_abspath(const char *path, int path_len)
{
static char buf[MAXPATHLEN];
unsigned len;
char *p, *slash;
if (*path == '/')
len = 0;
else {
char *ret;
#ifdef HAVE_GETCWD
ret = getcwd(buf, sizeof buf);
if (ret == NULL) {
rs_log_crit("getcwd failed: %s", strerror(errno));
}
#else
ret = getwd(buf);
if (ret == NULL) {
rs_log_crit("getwd failed: %s", strerror(errno));
}
#endif
len = strlen(buf);
if (len >= sizeof buf) {
rs_log_crit("getwd overflowed in dcc_abspath()");
}
buf[len++] = '/';
}
if (path_len <= 0)
path_len = strlen(path);
if (path_len >= 2 && *path == '.' && path[1] == '/') {
path += 2;
path_len -= 2;
}
if (len + (unsigned)path_len >= sizeof buf) {
rs_log_error("path overflowed in dcc_abspath()");
exit(EXIT_OUT_OF_MEMORY);
}
strncpy(buf + len, path, path_len);
buf[len + path_len] = '\0';
for (p = buf+len-(len > 0); (p = strstr(p, "/../")) != NULL; p = slash) {
*p = '\0';
if (!(slash = strrchr(buf, '/')))
slash = p;
strcpy(slash, p+3);
}
return buf;
}
/* Return -1 if a < b, 0 if a == b, and 1 if a > b */
int dcc_timecmp(struct timeval a, struct timeval b) {
if (a.tv_sec < b.tv_sec) {
return -1;
} else if (a.tv_sec > b.tv_sec) {
return 1;
} else if (a.tv_usec < b.tv_usec) {
/* at this point their tv_sec must be the same */
return -1;
} else if (a.tv_usec > b.tv_usec) {
return 1;
} else {
/* they must be equal */
return 0;
}
}
/* Return the current number of running processes. */
int dcc_getcurrentload(void) {
#if defined(linux)
double stats[3];
int running;
int total;
int last_pid;
int retval;
FILE *f = fopen("/proc/loadavg", "r");
if (NULL == f)
return -1;
retval = fscanf(f, "%lf %lf %lf %d/%d %d", &stats[0], &stats[1], &stats[2],
&running, &total, &last_pid);
fclose(f);
if (6 != retval)
return -1;
return running;
#else
return -1;
#endif
}
/**
* Wrapper for getloadavg() that tries to return all 3 samples, and reports
* -1 for those samples that are not available.
*
* Averages are over the last 1, 5, and 15 minutes, respectively.
**/
void dcc_getloadavg(double loadavg[3]) {
int num;
int i;
#if defined(HAVE_GETLOADAVG)
num = getloadavg(loadavg, 3);
#else
num = 0;
#endif
/* If getloadavg() didn't return 3 we want to fill
* in the invalid elements with -1 */
if (num < 0)
num = 0;
for (i=num; i < 3; ++i)
loadavg[i] = -1;
}
/**
* Duplicate the part of the string @p psrc up to a character in @p sep
* (or end of string), storing the result in @p pdst. @p psrc is updated to
* point to the terminator. (If the terminator is not found it will
* therefore point to \0.
*
* If there is no more string, then @p pdst is instead set to NULL, no
* memory is allocated, and @p psrc is not advanced.
**/
int dcc_dup_part(const char **psrc, char **pdst, const char *sep)
{
size_t len;
len = strcspn(*psrc, sep);
if (len == 0) {
*pdst = NULL;
} else {
if (!(*pdst = malloc(len + 1))) {
rs_log_error("failed to allocate string duplicate: %d", (int) len);
return EXIT_OUT_OF_MEMORY;
}
strncpy(*pdst, *psrc, len);
(*pdst)[len] = '\0';
(*psrc) += len;
}
return 0;
}
int dcc_remove_if_exists(const char *fname)
{
if (unlink(fname) && errno != ENOENT) {
rs_log_warning("failed to unlink %s: %s", fname,
strerror(errno));
return EXIT_IO_ERROR;
}
return 0;
}
/* Returns the number of processes in state D, the max non-cc/c++ RSS in kb and
* the max RSS program's name */
void dcc_get_proc_stats(int *num_D, int *max_RSS, char **max_RSS_name) {
#if defined(linux)
DIR *proc = opendir("/proc");
struct dirent *procsubdir;
static int pagesize = -1;
static char RSS_name[1024];
char statfile[1024];
FILE *f;
char name[1024];
char state;
int pid;
int rss_size;
int l;
char *c;
int isCC;
/* If this doesn't cut it for you, see how CVS does it:
* http://savannah.nongnu.org/cgi-bin/viewcvs/cvs/ccvs/lib/getpagesize.h */
if (pagesize == -1) {
#if HAVE_GETPAGESIZE
pagesize = getpagesize();
#else
pagesize = 8192;
#endif
}
*num_D = 0;
*max_RSS = 0;
*max_RSS_name = RSS_name;
RSS_name[0] = 0;
while ((procsubdir = readdir(proc)) != NULL) {
if (sscanf(procsubdir->d_name, "%d", &pid) != 1)
continue;
strcpy(statfile, "/proc/");
strcat(statfile, procsubdir->d_name);
strcat(statfile, "/stat");
f = fopen(statfile, "r");
if (f == NULL)
continue;
if (fscanf(f, "%*d %s %c %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %d",
name, &state, &rss_size) != 3) {
fclose(f);
continue;
}
rss_size = (rss_size * pagesize) / 1024; /* get rss_size in KB */
if (state == 'D') {
(*num_D)++;
}
l = strlen(RSS_name);
c = RSS_name;
/* check for .*{++,cc} */
isCC = (l >= 2) && ((c[l-1] == 'c' && c[l-2] == 'c')
|| (c[l-1] == '+' && c[l-2] == '+'));
if ((rss_size > *max_RSS) && !isCC) {
*max_RSS = rss_size;
strncpy(RSS_name, name, 1024);
}
fclose(f);
}
closedir(proc);
#else
static char RSS_name[] = "none";
*num_D = -1;
*max_RSS = -1;
*max_RSS_name = RSS_name;
#endif
}
/* Returns the number of sector read/writes since boot */
void dcc_get_disk_io_stats(int *n_reads, int *n_writes) {
#if defined(linux)
int retval;
int kernel26 = 1;
FILE *f;
int reads, writes, minor;
char dev[100];
char tmp[1024];
*n_reads = 0;
*n_writes = 0;
f = fopen("/proc/diskstats", "r");
if (f == NULL) {
if (errno != ENOENT)
return;
/* /proc/diskstats does not exist. probably a 2.4 kernel, so try reading
* /proc/partitions */
f = fopen("/proc/partitions", "r");
if (f == NULL)
return;
kernel26 = 0;
}
if (!kernel26) /* blast away 2 header lines in /proc/partitions */ {
retval = fscanf(f,
"%*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s");
if (retval == EOF) {
fclose(f);
return;
}
}
while (1) {
if (kernel26)
retval = fscanf(f, " %*d %d %s", &minor, dev);
else
retval = fscanf(f, " %*d %d %*d %s", &minor, dev);
if (retval == EOF || retval != 2)
break;
if (minor % 64 == 0
&& ((dev[0] == 'h' && dev[1] == 'd' && dev[2] == 'a')
|| (dev[0] == 's' && dev[1] == 'd' && dev[2] == 'a'))) {
/* disk stats */
retval = fscanf(f, " %*d %*d %d %*d %*d %*d %d %*d %*d %*d %*d",
&reads, &writes);
if (retval == EOF || retval != 2)
break;
/* only add stats for disks, so we don't double count */
*n_reads += reads;
*n_writes += writes;
} else {
#if 0
/* individual parition stats */
retval = fscanf(f, " %*d %d %*d %d", &reads, &writes);
if (retval == EOF || retval != 2)
break;
#endif
/* assume the lines aren't longer that 1024 characters */
if (fgets(tmp, 1024, f) == NULL)
break;
}
}
fclose(f);
#else
*n_reads = 0;
*n_writes = 0;
#endif
}
#ifndef HAVE_STRLCPY
/* like strncpy but does not 0 fill the buffer and always null
terminates. bufsize is the size of the destination buffer */
size_t strlcpy(char *d, const char *s, size_t bufsize)
{
size_t len = strlen(s);
size_t ret = len;
if (bufsize <= 0) return 0;
if (len >= bufsize) len = bufsize-1;
memcpy(d, s, len);
d[len] = 0;
return ret;
}
#endif
#ifndef HAVE_STRSEP
static char* strsep(char** str, const char* delims)
{
char* token;
if (*str == NULL) {
return NULL;
}
token = *str;
while (**str != '\0') {
if (strchr(delims, **str) != NULL) {
**str = '\0';
(*str)++;
return token;
}
(*str)++;
}
*str = NULL;
return token;
}
#endif
/* Given a string @p input, this function fills a
a newly-allocated array of strings with copies of
the input's whitespace-separated parts.
Returns 0 on success, 1 on error.
*/
int dcc_tokenize_string(const char *input, char ***argv_ptr)
{
size_t n_spaces = 0;
char *for_count;
char **ap;
char *input_copy;
/* First of all, make a copy of the input string;
* this way, we can destroy the copy.
*/
input_copy = strdup(input);
if (input_copy == NULL)
return 1;
/* Count the spaces in the string. */
for (for_count = input_copy; *for_count; for_count++)
if (isspace(*for_count))
n_spaces++;
/* The maximum number of space-delimited strings we
* can have is n_spaces + 1, and we need to add another 1 for
* the null-termination.
*/
*argv_ptr = malloc(sizeof(char*) * (n_spaces + 1 + 1));
if (*argv_ptr == NULL) {
free(input_copy);
return 1;
}
ap = *argv_ptr;
while((*ap = strsep(&input_copy, " \t\n")) != NULL) {
/* If the field is empty, do nothing */
if (**ap == '\0')
continue;
*ap = strdup(*ap);
if (*ap == NULL) {
char **p;
for (p = *argv_ptr; *p; p++) {
free(*p);
}
free(*argv_ptr);
free(input_copy);
return 1;
}
ap++;
}
free(input_copy);
return 0;
}
#ifndef HAVE_GETLINE
ssize_t getline(char **lineptr, size_t *n, FILE *stream) {
static const int buffer_size_increment = 100;
char *buffer;
size_t size;
size_t bytes_read;
int c;
char *new_buffer;
if (lineptr == NULL || stream == NULL || n == NULL ||
(*lineptr == NULL && *n != 0)) {
/* Invalid parameters. */
return -1;
}
buffer = *lineptr;
size = *n;
bytes_read = 0;
do {
/* Ensure that we have space for next character or '\0'. */
if (bytes_read + 1 > size) {
size += buffer_size_increment;
new_buffer = realloc(buffer, size);
if (new_buffer == NULL) {
/* Out of memory. */
*lineptr = buffer;
*n = size - buffer_size_increment;
return -1;
}
buffer = new_buffer;
}
if ((c = fgetc(stream)) == EOF)
break;
buffer[bytes_read++] = c;
} while (c != '\n');
buffer[bytes_read] = '\0';
*lineptr = buffer;
*n = size;
/* We return -1 on EOF for compatibility with GNU getline(). */
return bytes_read == 0 ? -1 : (ssize_t) bytes_read;
}
#endif
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