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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