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/* vim:fileencoding=utf-8:noet
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#define HANDLE_ERROR(msg) \
do { \
perror(msg); \
exit(EXIT_FAILURE); \
} while (0)
#define TEMP_FAILURE_RETRY(var, expression) \
do { \
ptrdiff_t __result; \
do { \
__result = (expression); \
} while (__result == -1L && errno == EINTR); \
var = __result; \
} while (0)
extern char **environ;
void do_write(int sd, const char *raw, size_t len) {
size_t written = 0;
ptrdiff_t n = -1;
while (written < len) {
TEMP_FAILURE_RETRY(n, write(sd, raw + written, len - written));
if (n == -1) {
close(sd);
HANDLE_ERROR("write() failed");
}
written += (size_t) n;
}
}
static inline size_t true_sun_len(const struct sockaddr_un *ptr) {
#ifdef __linux__
/* Because SUN_LEN uses strlen and abstract namespace paths begin
* with a null byte, SUN_LEN is broken for these. Passing the full
* struct size also fails on Linux, so compute manually. The
* abstract namespace is Linux-only. */
if (ptr->sun_path[0] == '\0') {
return sizeof(ptr->sun_family) + strlen(ptr->sun_path + 1) + 1;
}
#endif
#ifdef SUN_LEN
/* If the vendor provided SUN_LEN, we may as well use it. */
return SUN_LEN(ptr);
#else
/* SUN_LEN is not POSIX, so if it was not provided, use the struct
* size as a fallback. */
return sizeof(struct sockaddr_un);
#endif
}
#ifdef __linux__
# define ADDRESS_TEMPLATE "powerline-ipc-%d"
# define A +1
#else
# define ADDRESS_TEMPLATE "/tmp/powerline-ipc-%d"
# define A
#endif
#define ADDRESS_SIZE sizeof(ADDRESS_TEMPLATE) + (sizeof(uid_t) * 4)
#define NUM_ARGS_SIZE (sizeof(int) * 2 + 1)
#define BUF_SIZE 4096
#define NEW_ARGV_SIZE 200
int main(int argc, char *argv[]) {
int sd = -1;
int i;
ptrdiff_t read_size;
struct sockaddr_un server;
char address_buf[ADDRESS_SIZE];
const char eof[2] = "\0\0";
char num_args[NUM_ARGS_SIZE];
char buf[BUF_SIZE];
char *newargv[NEW_ARGV_SIZE];
char *wd = NULL;
char **envp;
const char *address;
int len;
if (argc < 2) {
printf("Must provide at least one argument.\n");
return EXIT_FAILURE;
}
if (argc > 3 && strcmp(argv[1], "--socket") == 0) {
address = argv[2];
argv += 2;
argc -= 2;
} else {
snprintf(address_buf, ADDRESS_SIZE, ADDRESS_TEMPLATE, getuid());
address = &(address_buf[0]);
}
sd = socket(AF_UNIX, SOCK_STREAM, 0);
if (sd == -1)
HANDLE_ERROR("socket() failed");
memset(&server, 0, sizeof(struct sockaddr_un));
server.sun_family = AF_UNIX;
strncpy(server.sun_path A, address, strlen(address));
if (connect(sd, (struct sockaddr *) &server, true_sun_len(&server)) < 0) {
close(sd);
/* We failed to connect to the daemon, execute powerline instead */
argc = (argc < NEW_ARGV_SIZE - 1) ? argc : NEW_ARGV_SIZE - 1;
for (i = 1; i < argc; i++)
newargv[i] = argv[i];
newargv[0] = "powerline-render";
newargv[argc] = NULL;
execvp("powerline-render", newargv);
}
len = snprintf(num_args, NUM_ARGS_SIZE, "%x", argc - 1);
do_write(sd, num_args, len);
do_write(sd, eof, 1);
for (i = 1; i < argc; i++) {
do_write(sd, argv[i], strlen(argv[i]));
do_write(sd, eof, 1);
}
wd = getcwd(NULL, 0);
if (wd != NULL) {
do_write(sd, wd, strlen(wd));
free(wd);
wd = NULL;
}
do_write(sd, eof, 1);
for(envp=environ; *envp; envp++) {
do_write(sd, *envp, strlen(*envp));
do_write(sd, eof, 1);
}
do_write(sd, eof, 2);
read_size = -1;
while (read_size != 0) {
TEMP_FAILURE_RETRY(read_size, read(sd, buf, BUF_SIZE));
if (read_size == -1) {
close(sd);
HANDLE_ERROR("read() failed");
} else if (read_size > 0) {
do_write(STDOUT_FILENO, buf, (size_t) read_size);
}
}
close(sd);
return 0;
}
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