/* Copyright 1989, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. */ /* * xdm - display manager daemon * Author: Keith Packard, MIT X Consortium * * util.c * * various utility routines */ #include "dm.h" #include "dm_error.h" #include /* for XmuGetHostname */ #ifdef X_POSIX_C_SOURCE # define _POSIX_C_SOURCE X_POSIX_C_SOURCE # include # undef _POSIX_C_SOURCE #else # if defined(X_NOT_POSIX) || defined(_POSIX_SOURCE) # include # else # define _POSIX_SOURCE # include # undef _POSIX_SOURCE # endif #endif #ifndef HAVE_ASPRINTF # include /* Allocating sprintf found in many newer libc's * Since xdm is single threaded, assumes arguments don't change * between initial length calculation and copy to result buffer. */ int Asprintf(char ** ret, const char *restrict format, ...) { va_list ap; int len; char buf[256]; va_start(ap, format); len = vsnprintf(buf, sizeof(buf), format, ap); if (len >= 0) { *ret = malloc(len + 1); if (*ret) { if (len < sizeof(buf)) { memcpy(*ret, buf, len + 1); } else { vsnprintf(*ret, len + 1, format, ap); } } else { len = -1; } } else { *ret = NULL; } va_end(ap); return len; } #endif /* !HAVE_ASPRINTF */ void printEnv (char **e) { while (*e) Debug ("%s\n", *e++); } static char * makeEnv (char *name, char *value) { char *result; asprintf(&result, "%s=%s", name, value); if (!result) { LogOutOfMem ("makeEnv"); return NULL; } return result; } char * getEnv (char **e, char *name) { int l = strlen (name); if (!e) return NULL; while (*e) { if ((int)strlen (*e) > l && !strncmp (*e, name, l) && (*e)[l] == '=') return (*e) + l + 1; ++e; } return NULL; } char ** setEnv (char **e, char *name, char *value) { char **new, **old; char *newe; int envsize; int l; l = strlen (name); newe = makeEnv (name, value); if (!newe) { LogOutOfMem ("setEnv"); return e; } if (e) { for (old = e; *old; old++) if ((int)strlen (*old) > l && !strncmp (*old, name, l) && (*old)[l] == '=') break; if (*old) { free (*old); *old = newe; return e; } envsize = old - e; new = (char **) realloc ((char *) e, (unsigned) ((envsize + 2) * sizeof (char *))); } else { envsize = 0; new = (char **) malloc (2 * sizeof (char *)); } if (!new) { LogOutOfMem ("setEnv"); free (newe); return e; } new[envsize] = newe; new[envsize+1] = NULL; return new; } char ** putEnv(const char *string, char **env) { char *v, *b, *n; int nl; if ((b = strchr(string, '=')) == NULL) return NULL; v = b + 1; nl = b - string; if ((n = malloc(nl + 1)) == NULL) { LogOutOfMem ("putAllEnv"); return NULL; } strncpy(n, string,nl + 1); n[nl] = 0; env = setEnv(env,n,v); free(n); return env; } void freeEnv (char **env) { char **e; if (env) { for (e = env; *e; e++) free (*e); free (env); } } #define isblank(c) ((c) == ' ' || c == '\t') char ** parseArgs (char **argv, char *string) { char *word; char *save; char **newargv; int i; i = 0; while (argv && argv[i]) ++i; if (!argv) { argv = (char **) malloc (sizeof (char *)); if (!argv) { LogOutOfMem ("parseArgs"); return NULL; } } word = string; for (;;) { if (!*string || isblank (*string)) { if (word != string) { newargv = (char **) realloc ((char *) argv, (unsigned) ((i + 2) * sizeof (char *))); save = malloc ((unsigned) (string - word + 1)); if (!newargv || !save) { LogOutOfMem ("parseArgs"); free ((char *) argv); if (save) free (save); return NULL; } else { argv = newargv; } argv[i] = strncpy (save, word, string-word); argv[i][string-word] = '\0'; i++; } if (!*string) break; word = string + 1; } ++string; } argv[i] = NULL; return argv; } void freeArgs (char **argv) { char **a; if (!argv) return; for (a = argv; *a; a++) free (*a); free ((char *) argv); } void CleanUpChild (void) { setsid(); #ifdef SIGCHLD (void) Signal (SIGCHLD, SIG_DFL); #endif (void) Signal (SIGTERM, SIG_DFL); (void) Signal (SIGPIPE, SIG_DFL); (void) Signal (SIGALRM, SIG_DFL); (void) Signal (SIGHUP, SIG_DFL); CloseOnFork (); } static char localHostbuf[256]; static int gotLocalHostname; char * localHostname (void) { if (!gotLocalHostname) { XmuGetHostname (localHostbuf, sizeof (localHostbuf) - 1); gotLocalHostname = 1; } return localHostbuf; } SIGVAL (*Signal (int sig, SIGFUNC handler))(int) { #ifdef HAVE_SIGACTION struct sigaction sigact, osigact; sigact.sa_handler = handler; sigemptyset(&sigact.sa_mask); sigact.sa_flags = 0; sigaction(sig, &sigact, &osigact); return osigact.sa_handler; #else /* __UNIXOS2__ */ return signal(sig, handler); #endif }