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