下面這段代碼摘自php/sapi/fpm/fpm/fpm_env.c
/*
* This piece of code has been inspirated from nginx and pureftpd code, whic
* are under BSD licence.
*
* To change the process title in Linux we have to set argv[1] to NULL
* and to copy the title to the same place where the argv[0] points to.
* However, argv[0] may be too small to hold a new title. Fortunately, Linux
* store argv[] and environ[] one after another. So we should ensure that is
* the continuous memory and then we allocate the new memory for environ[]
* and copy it. After this we could use the memory starting from argv[0] for
* our process title.
*/
for (i = 0; i < fpm_globals.argc; i++) {
if (first == NULL) {
first = fpm_globals.argv[i];
}
if (last == NULL || fpm_globals.argv[i] == last + 1) {
last = fpm_globals.argv[i] + strlen(fpm_globals.argv[i]);
}
}
if (environ) {
for (i = 0; environ[i]; i++) {
if (first == NULL) {
first = environ[i];
}
if (last == NULL || environ[i] == last + 1) {
last = environ[i] + strlen(environ[i]);
}
}
}
if (first == NULL || last == NULL) {
return 0;
}
fpm_env_argv_len = last - first;
fpm_env_argv = fpm_globals.argv;
if (environ != NULL) {
char **new_environ;
unsigned int env_nb = 0U;
while (environ[env_nb]) {
env_nb++;
}
if ((new_environ = malloc((1U + env_nb) * sizeof (char *))) == NULL) {
return -1;
}
new_environ[env_nb] = NULL;
while (env_nb > 0U) {
env_nb--;
new_environ[env_nb] = strdup(environ[env_nb]);
}
environ = new_environ;
}
#endif
#endif
spprintf(&title, 0, "master process (%s)", fpm_globals.config);
fpm_env_setproctitle(title);
efree(title);