3 * Copyright (C) Igor Sysoev
7 #include <ngx_config.h>
11 #if (NGX_SETPROCTITLE_USES_ENV)
14 * To change the process title in Linux and Solaris we have to set argv[1]
15 * to NULL and to copy the title to the same place where the argv[0] points to.
16 * However, argv[0] may be too small to hold a new title. Fortunately, Linux
17 * and Solaris store argv[] and environ[] one after another. So we should
18 * ensure that is the continuous memory and then we allocate the new memory
19 * for environ[] and copy it. After this we could use the memory starting
20 * from argv[0] for our process title.
22 * The Solaris's standard /bin/ps does not show the changed process title.
23 * You have to use "/usr/ucb/ps -w" instead. Besides, the UCB ps dos not
24 * show a new title if its length less than the origin command line length.
25 * To avoid it we append to a new title the origin command line in the
29 extern char **environ;
31 static char *ngx_os_argv_last;
34 ngx_init_setproctitle(ngx_log_t *log)
42 for (i = 0; environ[i]; i++) {
43 size += ngx_strlen(environ[i]) + 1;
46 p = ngx_alloc(size, log);
51 ngx_os_argv_last = ngx_os_argv[0];
53 for (i = 0; ngx_os_argv[i]; i++) {
54 if (ngx_os_argv_last == ngx_os_argv[i]) {
55 ngx_os_argv_last = ngx_os_argv[i] + ngx_strlen(ngx_os_argv[i]) + 1;
59 for (i = 0; environ[i]; i++) {
60 if (ngx_os_argv_last == environ[i]) {
62 size = ngx_strlen(environ[i]) + 1;
63 ngx_os_argv_last = environ[i] + size;
65 ngx_cpystrn(p, (u_char *) environ[i], size);
66 environ[i] = (char *) p;
78 ngx_setproctitle(char *title)
89 ngx_os_argv[1] = NULL;
91 p = ngx_cpystrn((u_char *) ngx_os_argv[0], (u_char *) "nginx: ",
92 ngx_os_argv_last - ngx_os_argv[0]);
94 p = ngx_cpystrn(p, (u_char *) title, ngx_os_argv_last - (char *) p);
100 for (i = 0; i < ngx_argc; i++) {
101 size += ngx_strlen(ngx_argv[i]) + 1;
104 if (size > (size_t) ((char *) p - ngx_os_argv[0])) {
107 * ngx_setproctitle() is too rare operation so we use
108 * the non-optimized copies
111 p = ngx_cpystrn(p, (u_char *) " (", ngx_os_argv_last - (char *) p);
113 for (i = 0; i < ngx_argc; i++) {
114 p = ngx_cpystrn(p, (u_char *) ngx_argv[i],
115 ngx_os_argv_last - (char *) p);
116 p = ngx_cpystrn(p, (u_char *) " ", ngx_os_argv_last - (char *) p);
119 if (*(p - 1) == ' ') {
126 if (ngx_os_argv_last - (char *) p) {
127 ngx_memset(p, NGX_SETPROCTITLE_PAD, ngx_os_argv_last - (char *) p);
130 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
131 "setproctitle: \"%s\"", ngx_os_argv[0]);
134 #endif /* NGX_SETPROCTITLE_USES_ENV */