gdb/gdb/procfs.c

1 /* Machine independent support for SVR4 /proc (process file system) for GDB.
57  * /proc file system, which is used on many versions of Unix
66  * /proc works by imitating a file system: you open a simulated file
71  * The most important thing to know about /proc and this module
72  * is that there are two very different interfaces to /proc:
75  * This module has to support both /proc interfaces.  This means
86 /* Determine which /proc API we are using:
103 #include "proc-utils.h"
159   procfs_ops.to_longname            = "Unix /proc child process";
161     "Unix /proc child process (started by the \"run\" command).";
212  * the unification of code that handles different versions of /proc.
286    syscall numbers.  Instead, they're stored in /proc/PID/sysent
302    concerning a /proc process.  There should be exactly one procinfo
314    implemented) "info proc" command, so that we can print useful
319 /* format strings for /proc paths */
321 #  define MAIN_PROC_NAME_FMT   "/proc/%d"
322 #  define CTL_PROC_NAME_FMT    "/proc/%d/ctl"
323 #  define AS_PROC_NAME_FMT     "/proc/%d/as"
324 #  define MAP_PROC_NAME_FMT    "/proc/%d/map"
325 #  define STATUS_PROC_NAME_FMT "/proc/%d/status"
326 #  define MAX_PROC_NAME_SIZE sizeof("/proc/99999/lwp/8096/lstatus")
328 /* the name of the proc status struct depends on the implementation */
332 /* format strings for /proc paths */
334 #  define MAIN_PROC_NAME_FMT   "/proc/%05d"
335 #  define CTL_PROC_NAME_FMT    "/proc/%05d"
336 #  define AS_PROC_NAME_FMT     "/proc/%05d"
337 #  define MAP_PROC_NAME_FMT    "/proc/%05d"
338 #  define STATUS_PROC_NAME_FMT "/proc/%05d"
339 #  define MAX_PROC_NAME_SIZE sizeof("/proc/ttttppppp")
341 /* the name of the proc status struct depends on the implementation */
356      several different fd's, depending on the version of /proc
359   int ctl_fd;			/* File descriptor for /proc control file */
367   int status_fd;		/* File descriptor for /proc status file */
368   int as_fd;			/* File descriptor for /proc as file */
370   char pathname[MAX_PROC_NAME_SIZE];	/* Pathname to /proc entry */
548    *     Pathnames for a process (<proc-id>):
549    *       /proc/<proc-id>/ctl
550    *       /proc/<proc-id>/status
551    *       /proc/<proc-id>/as
552    *       /proc/<proc-id>/map
554    *       /proc/<proc-id>/lwp/<lwp-id>/lwpctl
555    *       /proc/<proc-id>/lwp/<lwp-id>/lwpstatus
566    *       /proc/<proc-id>
718       sprintf (pi->pathname, "/proc/%05d/lwp/%d", pid, tid);
880    Extract syscall numbers and names from /proc/<pid>/sysent.  Initialize
901   sprintf (pathname, "/proc/%d/sysent", pi->pid);
905       error ("load_syscalls: Can't open /proc/%d/sysent", pi->pid);
911       error ("load_syscalls: Error reading /proc/%d/sysent", pi->pid);
916       error ("load_syscalls: /proc/%d/sysent contains no syscalls!", pi->pid);
925       error ("load_syscalls: Error reading /proc/%d/sysent", pi->pid);
1025 /* ===================  /proc  "MODULE" =================== */
1028  * This "module" is the interface layer between the /proc system API
1031  * that we need to use from the /proc API.
1034  * there are two very different implementations of the /proc API.
1359  *  === /proc are more inconsistent than usual.     MVS
1363  *    PR_RLC	-- traced process runs when last /proc file closed.
1364  *    PR_KLC    -- traced process is killed when last /proc file closed.
1494  * when debugger closes all /proc fds.
1527  * closes all /proc fds (or debugger exits or dies).
2792  * Send a signal to the proc or lwp with the semantics of "kill()".
2948   sprintf (pathname, "/proc/%d/ldt", pi->pid);
3010 /* =============== END, non-thread part of /proc  "MODULE" =============== */
3374 /* =================== END, /proc  "MODULE" =================== */
3469      Not all systems with /proc have all the exec* syscalls with the same
3580       sprintf (errmsg, "do_attach: couldn't open /proc file for process %d",
3603   /* Save some of the /proc state to be restored if we detach.  */
3673  * Since the /proc interface cannot give us individual registers,
3730    /proc, this makes sure that registers contains all the registers
3744  * Since the /proc interface will not read individual registers,
3874  * Translate /proc eventcodes (or possibly wait eventcodes)
3922 	      /* /proc file not found; presumably child has terminated. */
3945 	     This block will analyze the /proc status, and translate it
3948 	     If we actually had to call wait because the /proc file
4598   printf_filtered ("\tUsing the running image of %s %s via /proc.\n",
4807   /* Save some of the /proc state to be restored if we detach.  */
4906      Not all systems with /proc have all the exec* syscalls with the same
5104   int proc, thread;
5107   proc    = PIDGET (ptid);
5110   if ((pi = find_procinfo (proc, thread)) == NULL)
5135   int proc, thread;
5138   proc    = PIDGET (ptid);
5140   pi      = find_procinfo (proc, thread);
5143     sprintf (buf, "Process %d", proc);
5166   /* Translate from GDB's flags to /proc's */
5353   sprintf (pathname, "/proc/%d/map", pi->pid);
5420       sprintf (name, "/proc/%d/object/%s", pi->pid, map->pr_mapname);
5556  * Callback function, does the actual work for 'info proc mappings'.
5586  * Implement the "info proc mappings" subcommand.
5617  * Implement the "info proc" command.
5678 	     proc_error (process, "info proc, open_procinfo_files", __LINE__);
5733 	proc_error (pi, "proc-trace, get_traced_sysset", __LINE__);
5743 	    proc_error (pi, "proc-trace, set_traced_sysentry", __LINE__);
5748 	    proc_error (pi, "proc-trace, set_traced_sysexit", __LINE__);
5783   add_info ("proc", info_proc_cmd,
5784 	    "Show /proc process information about any running process.\n\
5787   add_com ("proc-trace-entry", no_class, proc_trace_sysentry_cmd,
5789   add_com ("proc-trace-exit", no_class, proc_trace_sysexit_cmd,
5791   add_com ("proc-untrace-entry", no_class, proc_untrace_sysentry_cmd,
5793   add_com ("proc-untrace-exit", no_class, proc_untrace_sysexit_cmd,