shaba/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd.git synced 2025-02-28 05:57:33 +03:00
Code

missing: define kernel internal limit TASK_COMM_LEN in userspace too

Browse Source 
We already use it at two places, and we are about to add one too.
Arbitrary literally hardcoded limits suck.
This commit is contained in:
Lennart Poettering 2018-06-01 21:43:43 +02:00
parent e225e5c3c6
commit 92f14395cd
3 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/basic/missing.h
View File

@ -1407,4 +1407,11 @@ struct statx {
#define AT_STATX_DONT_SYNC 0x4000
#endif
/* The maximum thread/process name length including trailing NUL byte. This mimics the kernel definition of the same
* name, which we need in userspace at various places but is not defined in userspace currently, neither under this
* name nor any other. */
#ifndef TASK_COMM_LEN
#define TASK_COMM_LEN 16
#endif
#include "missing_syscall.h"

2
src/basic/process-util.c
View File

@ -296,7 +296,7 @@ int rename_process(const char name[]) {
* can use PR_SET_NAME, which sets the thread name for the calling thread. */
if (prctl(PR_SET_NAME, name) < 0)
log_debug_errno(errno, "PR_SET_NAME failed: %m");
if (l > 15) /* Linux process names can be 15 chars at max */
if (l >= TASK_COMM_LEN) /* Linux process names can be 15 chars at max */
truncated = true;
/* Second step, change glibc's ID of the process name. */

2
src/test/test-process-util.c
View File

@ -366,7 +366,7 @@ static void test_rename_process_now(const char *p, int ret) {
assert_se(get_process_comm(0, &comm) >= 0);
log_info("comm = <%s>", comm);
assert_se(strneq(comm, p, 15));
assert_se(strneq(comm, p, TASK_COMM_LEN-1));
assert_se(get_process_cmdline(0, 0, false, &cmdline) >= 0);
/* we cannot expect cmdline to be renamed properly without privileges */