Folks,

I have written a set of functions I use to reset the process name of the
processes spawn by my application. I have found that different OS have
different ways of renaming the process name. I have ported by functions to
AIX, HP-UX, Solaris and Linux. I still have to add few checks for length
of ProcTitle so that I do not get buffer overflow.

Here is the code:
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#include <stdio.h>
#include <string.h>

/* Use #define USE_PSTAT for HP
** Use #define RESET_POINTER for AIX and Solaris
** Use nothing for Linux
*/


static char ProcTitle[40];
static char **ArgV0;

void InitProcTitle(char **TheArgV0)
{
ArgV0=TheArgV0;
}

void SetProcTitle(char *NewProcName)
{
#ifdef USE_PSTAT
union pstun un;
strcpy(ProcTitle, NewProcName);
un.pst_command = ProcTitle;
pstat(PSTAT_SETCMD, un, strlen(ProcTitle), 0, 0);
#else
strcpy(ProcTitle, NewProcName);
#ifdef RESET_POINTER
*ArgV0 = ProcTitle;
#else
strcpy(*ArgV0, ProcTitle);
#endif
#endif
}
void AppendProcTitle(char *NewProcExt)
{
#ifdef USE_PSTAT
union pstun un;
strcat(ProcTitle, ".");
strcat(ProcTitle, NewProcExt);
un.pst_command = ProcTitle;
pstat(PSTAT_SETCMD, un, strlen(ProcTitle), 0, 0);
#else
strcat(ProcTitle, ".");
strcat(ProcTitle, NewProcExt);
#ifdef RESET_POINTER
*ArgV0 = ProcTitle;
#else
strcpy(*ArgV0, ProcTitle);
#endif
#endif
}

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Here is the sample program to test it.
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int main(int argc, char *argv[])
{
char Buffer[80];

InitProcTitle(argv);

SetProcTitle("NewName");

printf("argv[0] = %s\n", argv[0]);

sprintf(Buffer, "ps -ef |grep $LOGNAME");
system(Buffer);

exit(0);
}
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This works fine on AIX, HP-UX and Linux using "/bin/ps -eft".
On Solaris I have to use "/usr/ucb/ps auxwwwt" command, /bin/ps will not
show the new name it will display the original name of the executable.

I am worried about Linux since I have to copy new name over argv[0]. I may
corrupt the memory. Does anyone know how big argv[0] is on Linux?

Thanks.




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