api_create and api_start: work toward making them thread-safe

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

src/lxc/af_unix.c

@@ -30,6 +30,7 @@
 #include <sys/un.h>
 
 #include "log.h"
+#include "lxclock.h"
 
 lxc_log_define(lxc_af_unix, lxc);
 
@@ -100,7 +101,9 @@ int lxc_af_unix_connect(const char *path)
 	int fd;
 	struct sockaddr_un addr;
 
+	process_lock();
 	fd = socket(PF_UNIX, SOCK_STREAM, 0);
+	process_unlock();
 	if (fd < 0)
 		return -1;
 
@@ -113,7 +116,9 @@ int lxc_af_unix_connect(const char *path)
 
 	if (connect(fd, (struct sockaddr *)&addr, sizeof(addr))) {
 		int tmp = errno;
+		process_lock();
 		close(fd);
+		process_unlock();
 		errno = tmp;
 		return -1;
 	}

src/lxc/commands.c

@@ -46,6 +46,7 @@
 #include "mainloop.h"
 #include "af_unix.h"
 #include "config.h"
+#include "lxclock.h"
 
 /*
  * This file provides the different functions for clients to
@@ -282,8 +283,11 @@ static int lxc_cmd(const char *name, struct lxc_cmd_rr *cmd, int *stopped,
 
 	ret = lxc_cmd_rsp_recv(sock, cmd);
 out:
-	if (!stay_connected || ret <= 0)
+	if (!stay_connected || ret <= 0) {
+		process_lock();
 		close(sock);
+		process_unlock();
+	}
 	if (stay_connected && ret > 0)
 		cmd->rsp.ret = sock;
 

src/lxc/lxccontainer.c

@@ -665,7 +665,9 @@ static bool create_container_dir(struct lxc_container *c)
 		free(s);
 		return false;
 	}
+	process_lock();
 	ret = mkdir(s, 0755);
+	process_unlock();
 	if (ret) {
 		if (errno == EEXIST)
 			ret = 0;
@@ -1362,11 +1364,15 @@ static bool lxcapi_save_config(struct lxc_container *c, const char *alt_file)
 	if (lret)
 		return false;
 
+	process_lock();
 	fout = fopen(alt_file, "w");
+	process_unlock();
 	if (!fout)
 		goto out;
 	write_config(fout, c->lxc_conf);
+	process_lock();
 	fclose(fout);
+	process_unlock();
 	ret = true;
 
 out:

src/lxc/parse.c

@@ -31,6 +31,7 @@
 #include "parse.h"
 #include "config.h"
 #include "utils.h"
+#include "lxclock.h"
 #include <lxc/log.h>
 
 /* Workaround for the broken signature of alphasort() in bionic.
@@ -90,7 +91,9 @@ int lxc_file_for_each_line(const char *file, lxc_file_cb callback, void *data)
 	char *line = NULL;
 	size_t len = 0;
 
+	process_lock();
 	f = fopen(file, "r");
+	process_unlock();
 	if (!f) {
 		SYSERROR("failed to open %s", file);
 		return -1;
@@ -104,7 +107,9 @@ int lxc_file_for_each_line(const char *file, lxc_file_cb callback, void *data)
 
 	if (line)
 		free(line);
+	process_lock();
 	fclose(f);
+	process_unlock();
 	return err;
 }
 

src/lxc/utils.c

@@ -47,6 +47,7 @@
 
 #include "utils.h"
 #include "log.h"
+#include "lxclock.h"
 
 lxc_log_define(lxc_utils, lxc);
 
@@ -409,7 +410,10 @@ int sha1sum_file(char *fnam, unsigned char *digest)
 
 	if (!fnam)
 		return -1;
-	if ((f = fopen_cloexec(fnam, "r")) < 0) {
+	process_lock();
+	f = fopen_cloexec(fnam, "r");
+	process_unlock();
+	if (f < 0) {
 		SYSERROR("Error opening template");
 		return -1;
 	}
@@ -439,7 +443,10 @@ int sha1sum_file(char *fnam, unsigned char *digest)
 		fclose(f);
 		return -1;
 	}
-	if (fclose(f) < 0) {
+	process_lock();
+	ret = fclose(f);
+	process_unlock();
+	if (ret < 0) {
 		SYSERROR("Failre closing template");
 		free(buf);
 		return -1;