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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219// SPDX-License-Identifier: GPL-2.0#include <linux/compiler.h>#include <linux/string.h>#include <sys/types.h>#include <sys/stat.h>#include <unistd.h>#include <string.h>#include <stdlib.h>#include <stdio.h>#include "subcmd-util.h"#include "exec-cmd.h"#include "subcmd-config.h"
#define MAX_ARGS 32#define PATH_MAX 4096
static const char *argv_exec_path;static const char *argv0_path;
void exec_cmd_init(const char *exec_name, const char *prefix, const char *exec_path, const char *exec_path_env){ subcmd_config.exec_name = exec_name; subcmd_config.prefix = prefix; subcmd_config.exec_path = exec_path; subcmd_config.exec_path_env = exec_path_env;
/* Setup environment variable for invoked shell script. */ setenv("PREFIX", prefix, 1);}
#define is_dir_sep(c) ((c) == '/')
static int is_absolute_path(const char *path){ return path[0] == '/';}
static const char *get_pwd_cwd(char *buf, size_t sz){ char *pwd; struct stat cwd_stat, pwd_stat; if (getcwd(buf, sz) == NULL) return NULL; pwd = getenv("PWD"); if (pwd && strcmp(pwd, buf)) { stat(buf, &cwd_stat); if (!stat(pwd, &pwd_stat) && pwd_stat.st_dev == cwd_stat.st_dev && pwd_stat.st_ino == cwd_stat.st_ino) { strlcpy(buf, pwd, sz); } } return buf;}
static const char *make_nonrelative_path(char *buf, size_t sz, const char *path){ if (is_absolute_path(path)) { if (strlcpy(buf, path, sz) >= sz) die("Too long path: %.*s", 60, path); } else { const char *cwd = get_pwd_cwd(buf, sz);
if (!cwd) die("Cannot determine the current working directory");
if (strlen(cwd) + strlen(path) + 2 >= sz) die("Too long path: %.*s", 60, path);
strcat(buf, "/"); strcat(buf, path); } return buf;}
char *system_path(const char *path){ char *buf = NULL;
if (is_absolute_path(path)) return strdup(path);
astrcatf(&buf, "%s/%s", subcmd_config.prefix, path);
return buf;}
const char *extract_argv0_path(const char *argv0){ const char *slash;
if (!argv0 || !*argv0) return NULL; slash = argv0 + strlen(argv0);
while (argv0 <= slash && !is_dir_sep(*slash)) slash--;
if (slash >= argv0) { argv0_path = strndup(argv0, slash - argv0); return argv0_path ? slash + 1 : NULL; }
return argv0;}
void set_argv_exec_path(const char *exec_path){ argv_exec_path = exec_path; /* * Propagate this setting to external programs. */ setenv(subcmd_config.exec_path_env, exec_path, 1);}
/* Returns the highest-priority location to look for subprograms. */char *get_argv_exec_path(void){ char *env;
if (argv_exec_path) return strdup(argv_exec_path);
env = getenv(subcmd_config.exec_path_env); if (env && *env) return strdup(env);
return system_path(subcmd_config.exec_path);}
static void add_path(char **out, const char *path){ if (path && *path) { if (is_absolute_path(path)) astrcat(out, path); else { char buf[PATH_MAX];
astrcat(out, make_nonrelative_path(buf, sizeof(buf), path)); }
astrcat(out, ":"); }}
void setup_path(void){ const char *old_path = getenv("PATH"); char *new_path = NULL; char *tmp = get_argv_exec_path();
add_path(&new_path, tmp); add_path(&new_path, argv0_path); free(tmp);
if (old_path) astrcat(&new_path, old_path); else astrcat(&new_path, "/usr/local/bin:/usr/bin:/bin");
setenv("PATH", new_path, 1);
free(new_path);}
static const char **prepare_exec_cmd(const char **argv){ int argc; const char **nargv;
for (argc = 0; argv[argc]; argc++) ; /* just counting */ nargv = malloc(sizeof(*nargv) * (argc + 2));
nargv[0] = subcmd_config.exec_name; for (argc = 0; argv[argc]; argc++) nargv[argc + 1] = argv[argc]; nargv[argc + 1] = NULL; return nargv;}
int execv_cmd(const char **argv) { const char **nargv = prepare_exec_cmd(argv);
/* execvp() can only ever return if it fails */ execvp(subcmd_config.exec_name, (char **)nargv);
free(nargv); return -1;}
int execl_cmd(const char *cmd,...){ int argc; const char *argv[MAX_ARGS + 1]; const char *arg; va_list param;
va_start(param, cmd); argv[0] = cmd; argc = 1; while (argc < MAX_ARGS) { arg = argv[argc++] = va_arg(param, char *); if (!arg) break; } va_end(param); if (MAX_ARGS <= argc) { fprintf(stderr, " Error: too many args to run %s\n", cmd); return -1; }
argv[argc] = NULL; return execv_cmd(argv);}