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/*
* set process title for ps (from sendmail)
*
* Clobbers argv of our main procedure so ps(1) will display the title.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "setproctitle.h"
#ifndef SPT_BUFSIZE
# define SPT_BUFSIZE 2048
#endif
extern char **environ;
static char **argv0;
static size_t argv_lth;
void initproctitle (int argc, char **argv)
{
int i;
char **envp = environ;
/*
* Move the environment so we can reuse the memory.
* (Code borrowed from sendmail.)
* WARNING: ugly assumptions on memory layout here;
* if this ever causes problems, #undef DO_PS_FIDDLING
*/
for (i = 0; envp[i] != NULL; i++)
continue;
environ = malloc(sizeof(char *) * (i + 1));
if (environ == NULL)
return;
for (i = 0; envp[i] != NULL; i++)
if ((environ[i] = strdup(envp[i])) == NULL)
return;
environ[i] = NULL;
if (i > 0)
argv_lth = envp[i-1] + strlen(envp[i-1]) - argv[0];
else
argv_lth = argv[argc-1] + strlen(argv[argc-1]) - argv[0];
if (argv_lth > 1)
argv0 = argv;
}
void setproctitle (const char *prog, const char *txt)
{
size_t i;
char buf[SPT_BUFSIZE];
if (!argv0)
return;
if (strlen(prog) + strlen(txt) + 5 > SPT_BUFSIZE)
return;
sprintf(buf, "%s -- %s", prog, txt);
i = strlen(buf);
if (i > argv_lth - 2) {
i = argv_lth - 2;
buf[i] = '\0';
}
memset(argv0[0], '\0', argv_lth); /* clear the memory area */
strcpy(argv0[0], buf);
argv0[1] = NULL;
}
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