Messages in this thread | | | Date | Thu, 03 Apr 2014 13:13:44 +0200 | From | "Ulrich Windl" <> | Subject | Q: setting the process name for ps |
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Hi!
Currently one has to fiddle with argv[] in-place when trying to change the process name "cmd") in Linux. However if you want to change the thread name ("comm"), there is a syscall (prctl(PR_SET_NAME, ...)) for it.
For comparison, in HP-UX there is also a syscall to change the process name for ps: --- #include <sys/pstat.h>
union pstun psu;
psu.pst_command = "foobar"; pstat(PSTAT_SETCMD, psu, strlen("foobar") - 1, 0, 0); ---
To be fair, HP-XU also has syscalls to get processes, threads and arguments: pstat_getlwp() pstat_getproc() pstat_getcommandline()
As Linux is different, I wonder whether there are any plans to provide a syscall to change the process name.
For those who aren't afraid of ugly code, here's a quick-and-dirty example how to change the process name in Linux (apologies, you guys know, but those who Google may not: --- #include <stdlib.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <time.h>
static int delay(void) { struct timespec ts;
ts.tv_sec = 10; ts.tv_nsec = 0; return nanosleep(&ts, NULL); }
int main(int argc, char *argv[]) { int l = strlen(argv[0]);
if ( argc > 1 ) l += 1 + strlen(argv[1]); if (l < 20 ) { printf("provide a long argument\n"); return 1; } printf("look: unchanged\n"); delay(); sprintf(argv[0], "proc %d", getpid()); printf("look: process title\n"); delay(); return 0; } ---
As I'm not subscribed to LKML, please keep me CC'd on you replies!
Thanks & regards, Ulrich Windl
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