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/*
Copyright (C) Andrew Tridgell 2002
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "ccache.h"
/*
execute a compiler backend, capturing all output to the given paths
the full path to the compiler to run is in argv[0]
*/
int execute(char **argv,
const char *path_stdout,
const char *path_stderr)
{
pid_t pid;
int status;
pid = fork();
if (pid == -1) fatal("Failed to fork");
if (pid == 0) {
int fd;
unlink(path_stdout);
fd = open(path_stdout, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL, 0666);
if (fd == -1) {
exit(STATUS_NOCACHE);
}
dup2(fd, 1);
close(fd);
unlink(path_stderr);
fd = open(path_stderr, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL, 0666);
if (fd == -1) {
exit(STATUS_NOCACHE);
}
dup2(fd, 2);
close(fd);
exit(execv(argv[0], argv));
}
if (waitpid(pid, &status, 0) != pid) {
fatal("waitpid failed");
}
if (WEXITSTATUS(status) == 0 && WIFSIGNALED(status)) {
return -1;
}
return WEXITSTATUS(status);
}
/*
find an executable by name in $PATH. Exclude any that are links to exclude_name
*/
char *find_executable(const char *name, const char *exclude_name)
{
char *path;
char *tok;
struct stat st1, st2;
path = getenv("CCACHE_PATH");
if (!path) {
path = getenv("PATH");
}
if (!path) {
cc_log("no PATH variable!?\n");
return NULL;
}
path = x_strdup(path);
/* search the path looking for the first compiler of the right name
that isn't us */
for (tok=strtok(path,":"); tok; tok = strtok(NULL, ":")) {
char *fname;
x_asprintf(&fname, "%s/%s", tok, name);
/* look for a normal executable file */
if (access(fname, X_OK) == 0 &&
lstat(fname, &st1) == 0 &&
stat(fname, &st2) == 0 &&
S_ISREG(st2.st_mode)) {
/* if its a symlink then ensure it doesn't
point at something called exclude_name */
if (S_ISLNK(st1.st_mode)) {
char *buf = x_realpath(fname);
if (buf) {
char *p = str_basename(buf);
if (strcmp(p, exclude_name) == 0) {
/* its a link to "ccache" ! */
free(p);
free(buf);
continue;
}
free(buf);
free(p);
}
}
/* found it! */
free(path);
return fname;
}
free(fname);
}
return NULL;
}
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