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452
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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11 #if (NGX_SETPROCTITLE_USES_ENV)
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12
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13 /*
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14 * To change the process title in Linux and Solaris we have to set argv[1]
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15 * to NULL and to copy the title to the same place where the argv[0] points to.
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16 * However, argv[0] may be too small to hold a new title. Fortunately, Linux
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17 * and Solaris store argv[] and environ[] one after another. So we should
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18 * ensure that is the continuous memory and then we allocate the new memory
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19 * for environ[] and copy it. After this we could use the memory starting
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20 * from argv[0] for our process title.
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21 *
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22 * The Solaris's standard /bin/ps does not show the changed process title.
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23 * You have to use "/usr/ucb/ps -w" instead. Besides, the UCB ps dos not
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24 * show a new title if its length less than the origin command line length.
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25 * To avoid it we append to a new title the origin command line in the
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26 * parenthesis.
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27 */
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28
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29 extern char **environ;
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30
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31 static char *ngx_os_argv_last;
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32
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493
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33 ngx_int_t
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34 ngx_init_setproctitle(ngx_log_t *log)
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452
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35 {
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493
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36 u_char *p;
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452
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37 size_t size;
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38 ngx_uint_t i;
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39
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40 size = 0;
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41
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42 for (i = 0; environ[i]; i++) {
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43 size += ngx_strlen(environ[i]) + 1;
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44 }
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45
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501
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46 p = ngx_alloc(size, log);
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47 if (p == NULL) {
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452
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48 return NGX_ERROR;
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49 }
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50
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51 ngx_os_argv_last = ngx_os_argv[0];
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52
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53 for (i = 0; ngx_os_argv[i]; i++) {
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54 if (ngx_os_argv_last == ngx_os_argv[i]) {
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55 ngx_os_argv_last = ngx_os_argv[i] + ngx_strlen(ngx_os_argv[i]) + 1;
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56 }
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57 }
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58
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59 for (i = 0; environ[i]; i++) {
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60 if (ngx_os_argv_last == environ[i]) {
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61
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62 size = ngx_strlen(environ[i]) + 1;
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63 ngx_os_argv_last = environ[i] + size;
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64
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493
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65 ngx_cpystrn(p, (u_char *) environ[i], size);
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66 environ[i] = (char *) p;
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452
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67 p += size;
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68 }
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69 }
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70
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71 ngx_os_argv_last--;
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72
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73 return NGX_OK;
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74 }
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75
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76
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493
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77 void
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78 ngx_setproctitle(char *title)
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452
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79 {
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80 u_char *p;
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81
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455
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82 #if (NGX_SOLARIS)
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452
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83
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84 ngx_int_t i;
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85 size_t size;
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86
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87 #endif
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88
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89 ngx_os_argv[1] = NULL;
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90
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507
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91 p = ngx_cpystrn((u_char *) ngx_os_argv[0], (u_char *) "nginx: ",
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452
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92 ngx_os_argv_last - ngx_os_argv[0]);
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93
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94 p = ngx_cpystrn(p, (u_char *) title, ngx_os_argv_last - (char *) p);
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95
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455
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96 #if (NGX_SOLARIS)
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452
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97
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98 size = 0;
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99
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100 for (i = 0; i < ngx_argc; i++) {
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101 size += ngx_strlen(ngx_argv[i]) + 1;
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102 }
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103
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104 if (size > (size_t) ((char *) p - ngx_os_argv[0])) {
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105
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106 /*
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107 * ngx_setproctitle() is too rare operation so we use
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108 * the non-optimized copies
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109 */
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110
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111 p = ngx_cpystrn(p, (u_char *) " (", ngx_os_argv_last - (char *) p);
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112
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113 for (i = 0; i < ngx_argc; i++) {
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114 p = ngx_cpystrn(p, (u_char *) ngx_argv[i],
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115 ngx_os_argv_last - (char *) p);
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116 p = ngx_cpystrn(p, (u_char *) " ", ngx_os_argv_last - (char *) p);
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117 }
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118
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119 if (*(p - 1) == ' ') {
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120 *(p - 1) = ')';
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121 }
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122 }
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123
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124 #endif
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125
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126 if (ngx_os_argv_last - (char *) p) {
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127 ngx_memset(p, NGX_SETPROCTITLE_PAD, ngx_os_argv_last - (char *) p);
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128 }
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129
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130 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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131 "setproctitle: \"%s\"", ngx_os_argv[0]);
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132 }
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133
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509
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134 #endif /* NGX_SETPROCTITLE_USES_ENV */
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