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path: root/criu/sysctl.c
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Diffstat (limited to 'criu/sysctl.c')
-rw-r--r--criu/sysctl.c192
1 files changed, 89 insertions, 103 deletions
diff --git a/criu/sysctl.c b/criu/sysctl.c
index e48476560..b06688712 100644
--- a/criu/sysctl.c
+++ b/criu/sysctl.c
@@ -16,105 +16,92 @@
#define KNOWN_NS_MASK (CLONE_NEWUTS | CLONE_NEWNET | CLONE_NEWIPC)
struct sysctl_userns_req {
- int op;
- unsigned int ns;
- size_t nr_req;
- struct sysctl_req *reqs;
+ int op;
+ unsigned int ns;
+ size_t nr_req;
+ struct sysctl_req *reqs;
};
-#define __SYSCTL_OP(__ret, __fd, __req, __type, __nr, __op) \
-do { \
- if (__op == CTL_READ) \
- __ret = sysctl_read_##__type(__fd, __req, \
- (__type *)(__req)->arg, \
- __nr); \
- else if (__op == CTL_WRITE) \
- __ret = sysctl_write_##__type(__fd, __req, \
- (__type *)(__req)->arg, \
- __nr); \
- else \
- __ret = -1; \
-} while (0)
-
-#define GEN_SYSCTL_READ_FUNC(__type, __conv) \
-static int sysctl_read_##__type(int fd, \
- struct sysctl_req *req, \
- __type *arg, \
- int nr) \
-{ \
- char buf[1024] = {0}; \
- int i, ret = -1; \
- char *p = buf; \
- \
- ret = read(fd, buf, sizeof(buf)); \
- if (ret < 0) { \
- pr_perror("Can't read %s", req->name); \
- ret = -1; \
- goto err; \
- } \
- \
- for (i = 0; i < nr && p < buf + sizeof(buf); p++, i++) \
- ((__type *)arg)[i] = __conv(p, &p, 10); \
- \
- if (i != nr) { \
- pr_err("Not enough params for %s (%d != %d)\n", \
- req->name, i, nr); \
- goto err; \
- } \
- \
- ret = 0; \
- \
-err: \
- return ret; \
-}
+#define __SYSCTL_OP(__ret, __fd, __req, __type, __nr, __op) \
+ do { \
+ if (__op == CTL_READ) \
+ __ret = sysctl_read_##__type(__fd, __req, (__type *)(__req)->arg, __nr); \
+ else if (__op == CTL_WRITE) \
+ __ret = sysctl_write_##__type(__fd, __req, (__type *)(__req)->arg, __nr); \
+ else \
+ __ret = -1; \
+ } while (0)
+
+#define GEN_SYSCTL_READ_FUNC(__type, __conv) \
+ static int sysctl_read_##__type(int fd, struct sysctl_req *req, __type *arg, int nr) \
+ { \
+ char buf[1024] = { 0 }; \
+ int i, ret = -1; \
+ char *p = buf; \
+ \
+ ret = read(fd, buf, sizeof(buf)); \
+ if (ret < 0) { \
+ pr_perror("Can't read %s", req->name); \
+ ret = -1; \
+ goto err; \
+ } \
+ \
+ for (i = 0; i < nr && p < buf + sizeof(buf); p++, i++) \
+ ((__type *)arg)[i] = __conv(p, &p, 10); \
+ \
+ if (i != nr) { \
+ pr_err("Not enough params for %s (%d != %d)\n", req->name, i, nr); \
+ goto err; \
+ } \
+ \
+ ret = 0; \
+ \
+ err: \
+ return ret; \
+ }
-#define GEN_SYSCTL_WRITE_FUNC(__type, __fmt) \
-static int sysctl_write_##__type(int fd, \
- struct sysctl_req *req, \
- __type *arg, \
- int nr) \
-{ \
- char buf[1024]; \
- int i, ret = -1; \
- int off = 0; \
- \
- for (i = 0; i < nr && off < sizeof(buf) - 1; i++) { \
- snprintf(&buf[off], sizeof(buf) - off, __fmt, arg[i]); \
- off += strlen(&buf[off]); \
- } \
- \
- if (i != nr) { \
- pr_err("Not enough space for %s (%d != %d)\n", \
- req->name, i, nr); \
- goto err; \
- } \
- \
- /* trailing spaces in format */ \
- while (off > 0 && isspace(buf[off - 1])) \
- off--; \
- buf[off + 0] = '\n'; \
- ret = write(fd, buf, off + 1); \
- if (ret < 0) { \
- pr_perror("Can't write %s", req->name); \
- ret = -1; \
- goto err; \
- } \
- \
- ret = 0; \
-err: \
- return ret; \
-}
+#define GEN_SYSCTL_WRITE_FUNC(__type, __fmt) \
+ static int sysctl_write_##__type(int fd, struct sysctl_req *req, __type *arg, int nr) \
+ { \
+ char buf[1024]; \
+ int i, ret = -1; \
+ int off = 0; \
+ \
+ for (i = 0; i < nr && off < sizeof(buf) - 1; i++) { \
+ snprintf(&buf[off], sizeof(buf) - off, __fmt, arg[i]); \
+ off += strlen(&buf[off]); \
+ } \
+ \
+ if (i != nr) { \
+ pr_err("Not enough space for %s (%d != %d)\n", req->name, i, nr); \
+ goto err; \
+ } \
+ \
+ /* trailing spaces in format */ \
+ while (off > 0 && isspace(buf[off - 1])) \
+ off--; \
+ buf[off + 0] = '\n'; \
+ ret = write(fd, buf, off + 1); \
+ if (ret < 0) { \
+ pr_perror("Can't write %s", req->name); \
+ ret = -1; \
+ goto err; \
+ } \
+ \
+ ret = 0; \
+ err: \
+ return ret; \
+ }
GEN_SYSCTL_READ_FUNC(u32, strtoul);
GEN_SYSCTL_READ_FUNC(u64, strtoull);
GEN_SYSCTL_READ_FUNC(s32, strtol);
GEN_SYSCTL_WRITE_FUNC(u32, "%u ");
-GEN_SYSCTL_WRITE_FUNC(u64, "%"PRIu64" ");
+GEN_SYSCTL_WRITE_FUNC(u64, "%" PRIu64 " ");
GEN_SYSCTL_WRITE_FUNC(s32, "%d ");
-static int
-sysctl_write_char(int fd, struct sysctl_req *req, char *arg, int nr)
+static int sysctl_write_char(int fd, struct sysctl_req *req, char *arg, int nr)
{
pr_debug("%s nr %d\n", req->name, nr);
if (dprintf(fd, "%s\n", arg) < 0)
@@ -123,19 +110,18 @@ sysctl_write_char(int fd, struct sysctl_req *req, char *arg, int nr)
return 0;
}
-static int
-sysctl_read_char(int fd, struct sysctl_req *req, char *arg, int nr)
+static int sysctl_read_char(int fd, struct sysctl_req *req, char *arg, int nr)
{
int ret = -1;
pr_debug("%s nr %d\n", req->name, nr);
ret = read(fd, arg, nr - 1);
if (ret < 0) {
- if (errno != EIO || !(req->flags & CTL_FLAGS_READ_EIO_SKIP))
+ if (errno != EIO || !(req->flags & CTL_FLAGS_READ_EIO_SKIP))
pr_perror("Can't read %s", req->name);
goto err;
}
- arg[ret]='\0';
+ arg[ret] = '\0';
ret = 0;
err:
@@ -144,7 +130,7 @@ err:
static int sysctl_userns_arg_size(int type)
{
- switch(CTL_TYPE(type)) {
+ switch (CTL_TYPE(type)) {
case __CTL_U32A:
return sizeof(u32) * CTL_LEN(type);
case CTL_U32:
@@ -204,7 +190,7 @@ static int __userns_sysctl_op(void *arg, int proc_fd, pid_t pid)
pid_t worker;
// fix up the pointer
- req = userns_req->reqs = (struct sysctl_req *) &userns_req[1];
+ req = userns_req->reqs = (struct sysctl_req *)&userns_req[1];
/* For files in the IPC/UTS namespaces, restoring is more complicated
* than for net. Unprivileged users cannot even open these files, so
@@ -234,17 +220,17 @@ static int __userns_sysctl_op(void *arg, int proc_fd, pid_t pid)
memset(fds, -1, sizeof(int) * userns_req->nr_req);
- for (i = 0; i < userns_req->nr_req; i++) {
+ for (i = 0; i < userns_req->nr_req; i++) {
int arg_len = sysctl_userns_arg_size(req->type);
- int name_len = strlen((char *) &req[1]) + 1;
+ int name_len = strlen((char *)&req[1]) + 1;
int total_len = sizeof(*req) + arg_len + name_len;
int flags;
/* fix up the pointers */
- req->name = (char *) &req[1];
+ req->name = (char *)&req[1];
req->arg = req->name + name_len;
- if (((char *) req) + total_len >= ((char *) userns_req) + MAX_UNSFD_MSG_SIZE) {
+ if (((char *)req) + total_len >= ((char *)userns_req) + MAX_UNSFD_MSG_SIZE) {
pr_err("bad sysctl req %s, too big: %d\n", req->name, total_len);
goto out;
}
@@ -268,7 +254,7 @@ static int __userns_sysctl_op(void *arg, int proc_fd, pid_t pid)
reqs[i] = req;
fds[i] = fd;
- req = (struct sysctl_req *) (((char *) req) + total_len);
+ req = (struct sysctl_req *)(((char *)req) + total_len);
}
/*
@@ -436,7 +422,7 @@ int sysctl_op(struct sysctl_req *req, size_t nr_req, int op, unsigned int ns)
userns_req->op = op;
userns_req->nr_req = nr_req;
userns_req->ns = ns;
- userns_req->reqs = (struct sysctl_req *) (&userns_req[1]);
+ userns_req->reqs = (struct sysctl_req *)(&userns_req[1]);
cur = userns_req->reqs;
for (i = 0; i < nr_req; i++) {
@@ -444,7 +430,7 @@ int sysctl_op(struct sysctl_req *req, size_t nr_req, int op, unsigned int ns)
int name_len = strlen(req[i].name) + 1;
int total_len = sizeof(*cur) + arg_len + name_len;
- if (((char *) cur) + total_len >= ((char *) userns_req) + MAX_UNSFD_MSG_SIZE) {
+ if (((char *)cur) + total_len >= ((char *)userns_req) + MAX_UNSFD_MSG_SIZE) {
pr_err("sysctl msg %s too big: %d\n", req[i].name, total_len);
return -1;
}
@@ -453,13 +439,13 @@ int sysctl_op(struct sysctl_req *req, size_t nr_req, int op, unsigned int ns)
cur->type = req[i].type;
cur->flags = req[i].flags;
- cur->name = (char *) &cur[1];
+ cur->name = (char *)&cur[1];
strcpy(cur->name, req[i].name);
cur->arg = cur->name + name_len;
memcpy(cur->arg, req[i].arg, arg_len);
- cur = (struct sysctl_req *) (((char *) cur) + total_len);
+ cur = (struct sysctl_req *)(((char *)cur) + total_len);
}
fd = open_proc(PROC_SELF, "ns");
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-05 18:46:54 +0300