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/* See LICENSE file for copyright and license details. */
#include "common.h"
char *
libgeome_util_areadlink(struct libgeome_context *ctx, const char *path)
{
char *ret = NULL, *new;
size_t size = 0;
ssize_t r;
do {
new = realloc(ret, size += 128U);
if (!new) {
ctx->print_error(ctx, "realloc: %s\n", strerror(errno));
free(ret);
return NULL;
}
ret = new;
r = readlink(path, ret, size - 1U);
if (r < 0) {
ctx->print_error(ctx, "readlink %s: %s\n", path, strerror(errno));
free(ret);
return NULL;
}
} while ((size_t)r >= size - 2U);
ret[r] = '\0';
return ret;
}
int
libgeome_util_safe_pipe(struct libgeome_context *ctx, int fds[2])
{
int i, old_fd, new_fd, nul_fd = -1;
if (pipe(fds)) {
ctx->print_error(ctx, "pipe: %s\n", strerror(errno));
return -1;
}
if (fds[0] > 2 && fds[1] > 2)
return 0;
for (i = 0; i < 2; i++) {
if (fds[i] > 2)
continue;
new_fd = fcntl(fds[i], F_DUPFD, 3);
if (new_fd < 0) {
ctx->print_error(ctx, "fcntl F_DUPFD 3: %s\n", strerror(errno));
goto fail;
}
old_fd = fds[i];
close(fds[i]);
fds[i] = new_fd;
nul_fd = open("/dev/null", O_RDWR);
if (nul_fd != old_fd) {
ctx->print_error(ctx, "open /dev/null O_RDWR: %s\n", strerror(errno));
goto fail;
}
}
if (old_fd < 2) {
new_fd = dup(nul_fd);
if (new_fd < 0) {
ctx->print_error(ctx, "duo: %s\n", strerror(errno));
goto fail;
}
if (new_fd > 2)
close(new_fd);
}
return 0;
fail:
close(fds[0]);
close(fds[1]);
return -1;
}
void
libgeome_util_spawn_async_kill(struct libgeome_context *ctx, const struct spawn_join_info *info, int signum)
{
(void) ctx;
kill(info->pid, signum);
}
int
libgeome_util_spawn_async_read(struct libgeome_context *ctx, const char *path, const char *const *argv,
unsigned int alarm_seconds, struct spawn_join_info *info_out, int *fd_out)
{
struct sigaction sa, old_sa;
sigset_t mask, old_mask;
int fds[2], ignore_sigchld;
pid_t pid;
if (sigemptyset(&mask)) {
ctx->print_error(ctx, "sigemptyset: %s\n", strerror(errno));
return -1;
}
if (sigaddset(&mask, SIGCHLD)) {
ctx->print_error(ctx, "sigaddset SIGCHLD: %s\n", strerror(errno));
return -1;
}
if (sigprocmask(SIG_BLOCK, &mask, &old_mask)) {
ctx->print_error(ctx, "sigprocmask SIG_BLOCK {SIGCHLD}: %s\n", strerror(errno));
return -1;
}
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_DFL;
if (sigaction(SIGCHLD, &sa, &old_sa)) {
ctx->print_error(ctx, "sigaction SIGCHLD: %s\n", strerror(errno));
if (sigprocmask(SIG_SETMASK, &old_mask, NULL)) {
ctx->print_abort(ctx, "sigprocmask SIG_SETMASK <old mask>: %s\n", strerror(errno));
abort();
}
return -1;
}
ignore_sigchld = !(old_sa.sa_flags & SA_SIGINFO) && old_sa.sa_handler == SIG_IGN;
if (!ignore_sigchld && sigaction(SIGCHLD, &old_sa, NULL)) {
ctx->print_abort(ctx, "sigaction SIGCHLD: %s\n", strerror(errno));
abort();
}
if (sigprocmask(SIG_SETMASK, &old_mask, NULL)) {
ctx->print_abort(ctx, "sigaction SIG_SETMASK <old mask>: %s\n", strerror(errno));
abort();
}
if (libgeome_util_safe_pipe(ctx, fds))
goto out;
pid = fork();
switch (pid) {
case -1:
ctx->print_error(ctx, "fork: %s\n", strerror(errno));
close(fds[0]);
close(fds[1]);
goto out;
case 0:
close(fds[0]);
if (dup2(fds[1], STDOUT_FILENO) != STDOUT_FILENO) {
ctx->print_error(ctx, "dup2 <pipe> <stdout>: %s\n", strerror(errno));
_exit(127);
}
close(fds[1]);
alarm(alarm_seconds);
execvp(path, (const void *)argv);
ctx->print_error(ctx, "execvp %s: %s\n", path, strerror(errno));
_exit(127);
default:
close(fds[1]);
break;
}
info_out->pid = pid;
info_out->ignore_sigchld = ignore_sigchld;
*fd_out = fds[0];
return 0;
out:
if (ignore_sigchld) {
sa.sa_handler = SIG_IGN;
if (sigaction(SIGCHLD, &sa, NULL)) {
ctx->print_abort(ctx, "sigaction SIGCHLD: %s\n", strerror(errno));
abort();
}
while (waitpid(-1, NULL, WNOHANG) != -1);
}
return -1;
}
int
libgeome_util_spawn_async_join(struct libgeome_context *ctx, const struct spawn_join_info *info, int *status_out)
{
struct sigaction sa;
int ret = 0;
if (waitpid(info->pid, status_out, 0) != info->pid) {
ctx->print_error(ctx, "waitpid <subprocess> 0: %s\n", strerror(errno));
ret = -1;
}
if (info->ignore_sigchld) {
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_IGN;
if (sigaction(SIGCHLD, &sa, NULL)) {
ctx->print_abort(ctx, "sigaction SIGCHLD: %s\n", strerror(errno));
abort();
}
while (waitpid(-1, NULL, WNOHANG) != -1);
}
return ret;
}
uint64_t
libgeome_util_parse_xml(char *s, struct location *location_out)
{
uint64_t ret = 0;
char *p = s;
errno = 0;
p = strstr(s, "<lat>");
if (!p)
p = strstr(s, "<latitude>");
if (!p)
goto skip_latitude;
p = &strchr(p, '>')[1];
while (isspace(*p))
p++;
location_out->latitude = strtod(p, &p);
if (errno)
goto skip_latitude;
while (isspace(*p))
p++;
if (*p != '<')
goto skip_latitude;
ret |= LIBGEOME_DATUM_LATITUDE;
skip_latitude:
p = strstr(s, "<lon>");
if (!p)
p = strstr(s, "<long>");
if (!p)
p = strstr(s, "<lng>");
if (!p)
p = strstr(s, "<longitude>");
if (!p)
goto skip_longitude;
p = &strchr(p, '>')[1];
while (isspace(*p))
p++;
location_out->longitude = strtod(p, &p);
if (errno)
goto skip_longitude;
while (isspace(*p))
p++;
if (*p != '<')
goto skip_longitude;
ret |= LIBGEOME_DATUM_LONGITUDE;
skip_longitude:
return ret;
}
uint64_t
libgeome_util_parse_json(char *s, struct location *location_out)
{
uint64_t ret = 0;
char *p = s;
errno = 0;
p = strstr(s, "\"lat\"");
if (!p)
p = strstr(s, "\"latitude\"");
if (!p)
goto skip_latitude;
p = &strchr(&p[1], '"')[1];
while (isspace(*p))
p++;
if (*p++ != ':')
goto skip_latitude;
while (isspace(*p))
p++;
location_out->latitude = strtod(p, &p);
if (errno)
goto skip_latitude;
while (isspace(*p))
p++;
if (*p != ',' && *p != '}')
goto skip_latitude;
ret |= LIBGEOME_DATUM_LATITUDE;
skip_latitude:
p = strstr(s, "\"lon\"");
if (!p)
p = strstr(s, "\"long\"");
if (!p)
p = strstr(s, "\"lng\"");
if (!p)
p = strstr(s, "\"longitude\"");
if (!p)
goto skip_longitude;
p = &strchr(&p[1], '"')[1];
while (isspace(*p))
p++;
if (*p++ != ':')
goto skip_longitude;
while (isspace(*p))
p++;
location_out->longitude = strtod(p, &p);
if (errno)
goto skip_longitude;
while (isspace(*p))
p++;
if (*p != ',' && *p != '}')
goto skip_longitude;
ret |= LIBGEOME_DATUM_LONGITUDE;
skip_longitude:
return ret;
}
uint64_t
libgeome_util_parse_plain(char *s, struct location *location_out)
{
errno = 0;
location_out->latitude = strtod(s, &s);
if (errno)
return 0;
while (isspace(*s))
s++;
if (*s == ',')
s++;
while (isspace(*s))
s++;
location_out->longitude = strtod(s, &s);
if (errno)
return 0;
while (isspace(*s))
s++;
if (*s)
return 0;
return LIBGEOME_DATUM_LATITUDE | LIBGEOME_DATUM_LONGITUDE;
}
uint64_t
libgeome_util_parse_output(char *s, struct location *location_out)
{
if (s[0] == '<')
return libgeome_util_parse_xml(s, location_out);
else if (s[0] == '{')
return libgeome_util_parse_json(s, location_out);
else
return libgeome_util_parse_plain(s, location_out);
}
|
