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https://github.com/javalsai/lidm.git
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javalsai
0b2d0bdf03
* chore(organization): allow nested header and c files * feat: add shell login "middleware" & etc: * lidm now calls `bash` (or other shells, depends on PACKAGE cfg) in login mode as a session wrapper to source most env (can be disabled) * this fixes a lot of env problems with all `/etc/profile` and more Extra: * implemented a musl compatible version of `execvpe` and now lidm should search for PATH everywhere it needs to * `search_path` now also checks if the found binary is properly executable * lidm now uses `confstr` for a decent PATH default if none is found * logs are unbuffered for cases where debug logs appear empty (exit without handlers moment) * chore: one-time evaluate certain makefile vars --------- Co-authored-by: grialion <48643945+grialion@users.noreply.github.com>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
#include <errno.h>
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#include <stdint.h>
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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 <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "util/path.h"
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// returns NULL on any error
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// otherwise it returns the absolute path of the program that MUST BE FREED
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//
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// Should be almost completely posix compliant, except it won't resolve empty
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// PATH entries relative to the cwd
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char* NULLABLE search_path(const char* NNULLABLE for_binary) {
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if (strchr(for_binary, '/') != NULL) {
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// skip absolute paths
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return strdup(for_binary);
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}
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char* path_env = getenv("PATH");
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if (!path_env) return NULL;
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char* path = strdup(path_env);
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if (!path) return NULL;
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char* tok = strtok(path, ":");
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while (tok) {
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char* bin_path;
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asprintf(&bin_path, "%s/%s", tok, for_binary);
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if (!bin_path) {
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free(path);
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return NULL;
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}
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struct stat stat_buf;
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if (stat(bin_path, &stat_buf) == 0 && access(bin_path, X_OK) == 0) {
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free(path);
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return bin_path;
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}
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free(bin_path);
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tok = strtok(NULL, ":");
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}
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free(path);
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return NULL;
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}
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// This is present in glibc ONLY with GNU extensions, this aims to provide a
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// musl compatible variant.
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//
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// Respects errno of exec functions family.
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int execvpe(const char* NNULLABLE file, char* NULLABLE const argv[NNULLABLE],
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char* NULLABLE const envp[NNULLABLE]) {
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char* path = search_path(file);
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if (!path) {
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errno = ENOENT;
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return -1;
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}
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int ret = execve(path, argv, envp);
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free(path);
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return ret;
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}
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