+: Determine if we can use sysctl with KERN_PROC_PATHNAME to find executing program
+echo " "
+echo "Determining whether we can use sysctl with KERN_PROC_PATHNAME to find executing program..." >&4
+$cat >try.c <<'EOM'
+/* Intentionally a long probe as I'd like to sanity check that the exact
+ approach is going to work, as thinking it will work, but only having it
+ part working at runtime is worse than not having it. */
+
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <sys/param.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int
+main(int argc, char **argv) {
+ char *buffer;
+ char *argv_leaf = strrchr(argv[0], '/');
+ char *buffer_leaf;
+ size_t size = 0;
+ int mib[4];
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC;
+ mib[2] = KERN_PROC_PATHNAME;
+ mib[3] = -1;
+
+ if (!argv_leaf) {
+ fprintf(stderr, "Can't locate / in '%s'\n", argv[0]);
+ return 1;
+ }
+
+ if (sysctl(mib, 4, NULL, &size, NULL, 0)) {
+ perror("sysctl");
+ return 2;
+ }
+
+ if (size < strlen(argv_leaf) + 1) {
+ fprintf(stderr, "size %lu is too short for a path\n",
+ (unsigned long) size);
+ return 3;
+ }
+
+ if (size > MAXPATHLEN * MAXPATHLEN) {
+ fprintf(stderr, "size %lu is too long for a path\n",
+ (unsigned long) size);
+ return 4;
+ }
+
+ buffer = malloc(size);
+ if (!buffer) {
+ perror("malloc");
+ return 5;
+ }
+
+ if (sysctl(mib, 4, buffer, &size, NULL, 0)) {
+ perror("sysctl");
+ return 6;
+ }
+
+ if (strlen(buffer) + 1 != size) {
+ fprintf(stderr, "size != strlen(buffer) + 1 (%lu != %lu)\n",
+ (unsigned long)size, (unsigned long)strlen(buffer) + 1);
+ return 7;
+ }
+
+
+ if (*buffer != '/') {
+ fprintf(stderr, "Not an absolute path: '%s'\n", buffer);
+ return 8;
+ }
+
+ if (strstr(buffer, "/./")) {
+ fprintf(stderr, "Contains /./: '%s'\n", buffer);
+ return 9;
+ }
+
+ if (strstr(buffer, "/../")) {
+ fprintf(stderr, "Contains /../: '%s'\n", buffer);
+ return 10;
+ }
+
+ buffer_leaf = strrchr(buffer, '/');
+ if (strcmp(buffer_leaf, argv_leaf) != 0) {
+ fprintf(stderr, "Leafnames differ: '%s' vs '%s'\n", argv[0], buffer);
+ return 11;
+ }
+
+ free(buffer);
+
+ return 0;
+}
+EOM
+
+val=$undef
+set try
+if eval $compile; then
+ if $run ./try; then
+ echo "You can use sysctl with KERN_PROC_PATHNAME to find the executing program." >&4
+ val="$define"
+ else
+ echo "Nope, sysctl with KERN_PROC_PATHNAME doesn't work here." >&4
+ val="$undef"
+ fi
+else
+ echo "I'm unable to compile the test program." >&4
+ echo "I'll assume no sysctl with KERN_PROC_PATHNAME here." >&4
+ val="$undef"
+fi
+$rm_try
+set usekernprocpathname
+eval $setvar
+
+: Determine if we can use _NSGetExecutablePath to find executing program
+echo " "
+echo "Determining whether we can use _NSGetExecutablePath to find executing program..." >&4
+$cat >try.c <<'EOM'
+/* Intentionally a long probe as I'd like to sanity check that the exact
+ approach is going to work, as thinking it will work, but only having it
+ part working at runtime is worse than not having it. */
+#include <mach-o/dyld.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/param.h>
+#include <string.h>
+
+int
+main(int argc, char **argv) {
+ char buf[1];
+ uint32_t size = sizeof(buf);
+ int result;
+ char *buffer;
+ char *tidied;
+ char *argv_leaf = strrchr(argv[0], '/');
+ char *tidied_leaf;
+
+ if (!argv_leaf) {
+ fprintf(stderr, "Can't locate / in '%s'\n", argv[0]);
+ return 1;
+ }
+
+ _NSGetExecutablePath(buf, &size);
+ if (size > MAXPATHLEN * MAXPATHLEN) {
+ fprintf(stderr, "_NSGetExecutablePath size %u is too long for a path\n",
+ (unsigned int) size);
+ return 2;
+ }
+
+ buffer = malloc(size);
+ if (!buffer) {
+ perror("malloc");
+ return 3;
+ }
+
+ result = _NSGetExecutablePath(buffer, &size);
+ if (result != 0) {
+ fprintf(stderr, "_NSGetExecutablePath returned %i for a size of %u\n",
+ result, (unsigned int) size);
+ return 4;
+ }
+
+ tidied = realpath(buffer, NULL);
+ if (!tidied) {
+ perror("realpath");
+ return 5;
+ }
+
+ free(buffer);
+
+ if (*tidied != '/') {
+ fprintf(stderr, "Not an absolute path: '%s'\n", tidied);
+ return 6;
+ }
+
+ if (strstr(tidied, "/./")) {
+ fprintf(stderr, "Contains /./: '%s'\n", tidied);
+ return 7;
+ }
+
+ if (strstr(tidied, "/../")) {
+ fprintf(stderr, "Contains /../: '%s'\n", tidied);
+ return 8;
+ }
+
+ tidied_leaf = strrchr(tidied, '/');
+ if (strcmp(tidied_leaf, argv_leaf) != 0) {
+ fprintf(stderr, "Leafnames differ: '%s' vs '%s'\n", argv[0], tidied);
+ return 9;
+ }
+
+ free(tidied);
+
+ return 0;
+}
+EOM
+
+val=$undef
+set try
+if eval $compile; then
+ if $run ./try; then
+ echo "You can use _NSGetExecutablePath to find the executing program." >&4
+ val="$define"
+ else
+ echo "Nope, _NSGetExecutablePath doesn't work here." >&4
+ fi
+else
+ echo "I'm unable to compile the test program." >&4
+ echo "I'll assume no _NSGetExecutablePath here." >&4
+fi
+$rm_try
+set usensgetexecutablepath
+eval $setvar
+
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