execute.h

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #ifndef fooexecutehfoo
   4 #define fooexecutehfoo
   5
   6 typedef struct ExecStatus ExecStatus;
   7 typedef struct ExecCommand ExecCommand;
   8 typedef struct ExecContext ExecContext;
   9
  10 #include <sys/time.h>
  11 #include <sys/resource.h>
  12 #include <sys/capability.h>
  13 #include <stdbool.h>
  14 #include <stdio.h>
  15 #include <sched.h>
  16
  17 #include "list.h"
  18 #include "util.h"
  19
  20 /* Abstract namespace! */
  21 #define LOGGER_SOCKET "/systemd/logger"
  22
  23 typedef enum ExecOutput {
  24         EXEC_OUTPUT_CONSOLE,
  25         EXEC_OUTPUT_NULL,
  26         EXEC_OUTPUT_SYSLOG,
  27         EXEC_OUTPUT_KERNEL,
  28         _EXEC_OUTPUT_MAX,
  29         _EXEC_OUTPUT_INVALID = -1
  30 } ExecOutput;
  31
  32 typedef enum ExecInput {
  33         EXEC_INPUT_NULL,
  34         EXEC_INPUT_CONSOLE,
  35         _EXEC_INPUT_MAX,
  36         _EXEC_INPUT_INVALID = -1
  37 } ExecInput;
  38
  39 struct ExecStatus {
  40         pid_t pid;
  41         usec_t timestamp;
  42         int code;     /* as in siginfo_t::si_code */
  43         int status;   /* as in sigingo_t::si_status */
  44 };
  45
  46 struct ExecCommand {
  47         char *path;
  48         char **argv;
  49         ExecStatus exec_status;
  50         LIST_FIELDS(ExecCommand, command); /* useful for chaining commands */
  51 };
  52
  53 struct ExecContext {
  54         char **environment;
  55         mode_t umask;
  56         struct rlimit *rlimit[RLIMIT_NLIMITS];
  57         char *working_directory, *root_directory;
  58         int oom_adjust;
  59         int nice;
  60         int ioprio;
  61         int cpu_sched_policy;
  62         int cpu_sched_priority;
  63         cpu_set_t cpu_affinity;
  64         unsigned long timer_slack_ns;
  65
  66         bool oom_adjust_set:1;
  67         bool nice_set:1;
  68         bool ioprio_set:1;
  69         bool cpu_sched_set:1;
  70         bool cpu_affinity_set:1;
  71         bool timer_slack_ns_set:1;
  72
  73         ExecInput input;
  74         ExecOutput output;
  75         int syslog_priority;
  76         char *syslog_identifier;
  77
  78         /* FIXME: all privs related settings need to be enforced */
  79         cap_t capabilities;
  80         int secure_bits;
  81         uint64_t capability_bounding_set_drop;
  82
  83         /* Since resolving these names might might involve socket
  84          * connections and we don't want to deadlock ourselves these
  85          * names are resolved on execution only and in the child
  86          * process. */
  87         char *user;
  88         char *group;
  89         char **supplementary_groups;
  90 };
  91
  92 typedef enum ExitStatus {
  93         /* EXIT_SUCCESS defined by libc */
  94         /* EXIT_FAILURE defined by libc */
  95         EXIT_INVALIDARGUMENT = 2,
  96         EXIT_NOTIMPLEMENTED = 3,
  97         EXIT_NOPERMISSION = 4,
  98         EXIT_NOTINSTALLED = 5,
  99         EXIT_NOTCONFIGURED = 6,
 100         EXIT_NOTRUNNING = 7,
 101
 102         /* The LSB suggests that error codes >= 200 are "reserved". We
 103          * use them here under the assumption that they hence are
 104          * unused by init scripts.
 105          *
 106          * http://refspecs.freestandards.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html */
 107
 108         EXIT_CHDIR = 200,
 109         EXIT_NICE,
 110         EXIT_FDS,
 111         EXIT_EXEC,
 112         EXIT_MEMORY,
 113         EXIT_LIMITS,
 114         EXIT_OOM_ADJUST,
 115         EXIT_SIGNAL_MASK,
 116         EXIT_INPUT,
 117         EXIT_OUTPUT,
 118         EXIT_CHROOT,
 119         EXIT_PGID,
 120         EXIT_IOPRIO,
 121         EXIT_TIMERSLACK,
 122         EXIT_SECUREBITS,
 123         EXIT_SETSCHEDULER,
 124         EXIT_CPUAFFINITY
 125 } ExitStatus;
 126
 127 int exec_spawn(const ExecCommand *command, const ExecContext *context, int *fds, unsigned n_fds, pid_t *ret);
 128
 129 void exec_command_free_list(ExecCommand *c);
 130 void exec_command_free_array(ExecCommand **c, unsigned n);
 131
 132 char *exec_command_line(ExecCommand *c);
 133 void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix);
 134 void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix);
 135
 136 void exec_context_init(ExecContext *c);
 137 void exec_context_done(ExecContext *c);
 138 void exec_context_dump(ExecContext *c, FILE* f, const char *prefix);
 139
 140 void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status);
 141
 142 const char* exec_output_to_string(ExecOutput i);
 143 int exec_output_from_string(const char *s);
 144
 145 const char* exec_input_to_string(ExecInput i);
 146 int exec_input_from_string(const char *s);
 147
 148 #endif