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psmisc.5896
psmisc-22.21-upstream.patch
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File psmisc-22.21-upstream.patch of Package psmisc.5896
--- ChangeLog +++ ChangeLog 2014-03-24 00:00:00.000000000 +0000 @@ -1,3 +1,9 @@ + * Make usage of linked lists of devices found in + /proc/self/mountinfo optional + * Make timeout() in timeout.c work with shared mmap to + reduce the load due write/read the stat buffers + * Add list_sort() to lists.h to be able to sort lists + Changes in 22.21 ================ * Missing comma in fuser(1) added Debian #702391 --- configure.ac +++ configure.ac 2014-03-24 00:00:00.000000000 +0000 @@ -42,6 +42,17 @@ if test "$enable_timeout_stat" = "static fi AM_CONDITIONAL([WANT_TIMEOUT_STAT], [test "$enable_timeout_stat" = "static"]) +# Use string search for network based file systems but only if the system +# has /proc/self/mountinfo +AC_SUBST([WITH_MOUNTINFO_LIST]) +AC_ARG_ENABLE([mountinfo_list], + [AS_HELP_STRING([--enable-mountinfo-list], [Use the list in /proc/self/mountinfo to replace stat(2) syscall on network file systems shares])], + [enable_mountinfo_list="yes"], + [enable_mountinfo_list="no"]) +if test "$enable_mountinfo_list" = "yes" -a -e /proc/self/mountinfo ; then + AC_DEFINE([WITH_MOUNTINFO_LIST], [1], [Use list in /proc/self/mountinfo to replace stat calls]) +fi + # Enable hardened compile and link flags AC_ARG_ENABLE([harden_flags], [AS_HELP_STRING([--disable-harden-flags], [disable hardened compilier and linker flags])], --- src/fuser.c +++ src/fuser.c 2014-03-24 15:50:46.202235621 +0000 @@ -58,6 +58,7 @@ #include "fuser.h" #include "signals.h" #include "i18n.h" +#include "timeout.h" //#define DEBUG 1 @@ -104,25 +105,14 @@ static void debug_match_lists(struct nam struct device_list *dev_head); #endif -#ifdef _LISTS_H +#if defined(WITH_MOUNTINFO_LIST) static void clear_mntinfo(void) __attribute__ ((__destructor__)); static void init_mntinfo(void) __attribute__ ((__constructor__)); -static dev_t device(const char *path); +static int mntstat(const char *path, struct stat *buf); #endif +static stat_t thestat = stat; static char *expandpath(const char *path); -#ifdef WITH_TIMEOUT_STAT -#if (WITH_TIMEOUT_STAT == 2) -#include "timeout.h" -#else -typedef int (*stat_t) (const char *, struct stat *); -static int timeout(stat_t func, const char *path, struct stat *buf, - unsigned int seconds); -#endif -#else -#define timeout(func,path,buf,dummy) (func)((path),(buf)) -#endif /* WITH_TIMEOUT_STAT */ - static void usage(const char *errormsg) { if (errormsg != NULL) @@ -191,10 +181,6 @@ scan_procs(struct names *names_head, str struct stat *cwd_stat = NULL; struct stat *exe_stat = NULL; struct stat *root_stat = NULL; -#ifdef _LISTS_H - char path[256] = "/proc/", *slash; - ssize_t len; -#endif if (topproc_dent->d_name[0] < '0' || topproc_dent->d_name[0] > '9') /* Not a process */ continue; @@ -204,30 +190,12 @@ scan_procs(struct names *names_head, str continue; uid = getpiduid(pid); -#ifdef _LISTS_H - strcpy(&path[6], topproc_dent->d_name); - len = strlen(path); - slash = &path[len]; - - *slash = '\0'; - strcat(slash, "/cwd"); - cwd_dev = device(path); - - *slash = '\0'; - strcat(slash, "/exe"); - exe_dev = device(path); - - *slash = '\0'; - strcat(slash, "/root"); - root_dev = device(path); -#else cwd_stat = get_pidstat(pid, "cwd"); exe_stat = get_pidstat(pid, "exe"); root_stat = get_pidstat(pid, "root"); cwd_dev = cwd_stat ? cwd_stat->st_dev : 0; exe_dev = exe_stat ? exe_stat->st_dev : 0; root_dev = root_stat ? root_stat->st_dev : 0; -#endif /* Scan the devices */ for (dev_tmp = dev_head; dev_tmp != NULL; @@ -463,7 +431,7 @@ add_special_proc(struct names *name_list } int parse_file(struct names *this_name, struct inode_list **ino_list, - const char opts) + const opt_type opts) { char *new = expandpath(this_name->filename); if (new) { @@ -471,8 +439,7 @@ int parse_file(struct names *this_name, free(this_name->filename); this_name->filename = strdup(new); } - - if (timeout(stat, this_name->filename, &(this_name->st), 5) != 0) { + if (timeout(thestat, this_name->filename, &(this_name->st), 5) != 0) { if (errno == ENOENT) fprintf(stderr, _("Specified filename %s does not exist.\n"), @@ -514,7 +481,7 @@ parse_unixsockets(struct names *this_nam int parse_mounts(struct names *this_name, struct device_list **dev_list, - const char opts) + const opt_type opts) { dev_t match_device; @@ -1015,6 +982,10 @@ int main(int argc, char *argv[]) break; case 'c': opts |= OPT_MOUNTS; +#if defined(WITH_MOUNTINFO_LIST) + thestat = mntstat; +#endif + read_proc_mounts(&mounts); break; case 'f': /* ignored */ @@ -1033,6 +1004,9 @@ int main(int argc, char *argv[]) return 0; case 'm': opts |= OPT_MOUNTS; +#if defined(WITH_MOUNTINFO_LIST) + thestat = mntstat; +#endif read_proc_mounts(&mounts); break; case 'M': @@ -1401,7 +1375,7 @@ static struct stat *get_pidstat(const pi if ((st = (struct stat *)malloc(sizeof(struct stat))) == NULL) return NULL; snprintf(pathname, 256, "/proc/%d/%s", pid, filename); - if (timeout(stat, pathname, st, 5) != 0) { + if (timeout(thestat, pathname, st, 5) != 0) { free(st); return NULL; } @@ -1433,7 +1407,7 @@ check_dir(const pid_t pid, const char *d snprintf(filepath, MAX_PATHNAME, "/proc/%d/%s/%s", pid, dirname, direntry->d_name); - if (timeout(stat, filepath, &st, 5) != 0) { + if (timeout(thestat, filepath, &st, 5) != 0) { if (errno != ENOENT && errno != ENOTDIR) { fprintf(stderr, _("Cannot stat file %s: %s\n"), filepath, strerror(errno)); @@ -1472,7 +1446,7 @@ check_dir(const pid_t pid, const char *d if (thedev != ino_tmp->device) continue; if (!st.st_ino - && timeout(stat, filepath, &st, 5) != 0) { + && timeout(thestat, filepath, &st, 5) != 0) { fprintf(stderr, _("Cannot stat file %s: %s\n"), filepath, strerror(errno)); @@ -1542,7 +1516,7 @@ static uid_t getpiduid(const pid_t pid) if (snprintf(pathname, MAX_PATHNAME, "/proc/%d", pid) < 0) return 0; - if (timeout(stat, pathname, &st, 5) != 0) + if (timeout(thestat, pathname, &st, 5) != 0) return 0; return st.st_uid; } @@ -1578,7 +1552,7 @@ void fill_unix_cache(struct unixsocket_l path = scanned_path; if (*scanned_path == '@') scanned_path++; - if (timeout(stat, scanned_path, &st, 5) < 0) { + if (timeout(thestat, scanned_path, &st, 5) < 0) { free(path); continue; } @@ -1723,7 +1697,7 @@ scan_knfsd(struct names *names_head, str if ((find_space = strpbrk(line, " \t")) == NULL) continue; *find_space = '\0'; - if (timeout(stat, line, &st, 5) != 0) { + if (timeout(thestat, line, &st, 5) != 0) { continue; } /* Scan the devices */ @@ -1767,7 +1741,7 @@ scan_mounts(struct names *names_head, st if ((find_space = strchr(find_mountp, ' ')) == NULL) continue; *find_space = '\0'; - if (timeout(stat, find_mountp, &st, 5) != 0) { + if (timeout(thestat, find_mountp, &st, 5) != 0) { continue; } /* Scan the devices */ @@ -1814,7 +1788,7 @@ scan_swaps(struct names *names_head, str if (*find_space == '\0') continue; } - if (timeout(stat, line, &st, 5) != 0) { + if (timeout(thestat, line, &st, 5) != 0) { continue; } /* Scan the devices */ @@ -1835,73 +1809,7 @@ scan_swaps(struct names *names_head, str fclose(fp); } -/* - * Execute stat(2) system call with timeout to avoid deadlock - * on network based file systems. - */ -#if defined(WITH_TIMEOUT_STAT) && (WITH_TIMEOUT_STAT == 1) - -static sigjmp_buf jenv; - -static void sigalarm(int sig) -{ - if (sig == SIGALRM) - siglongjmp(jenv, 1); -} - -static int -timeout(stat_t func, const char *path, struct stat *buf, unsigned int seconds) -{ - pid_t pid = 0; - int ret = 0, pipes[4]; - ssize_t len; - - if (pipe(&pipes[0]) < 0) - goto err; - switch ((pid = fork())) { - case -1: - close(pipes[0]); - close(pipes[1]); - goto err; - case 0: - (void)signal(SIGALRM, SIG_DFL); - close(pipes[0]); - if ((ret = func(path, buf)) == 0) - do - len = write(pipes[1], buf, sizeof(struct stat)); - while (len < 0 && errno == EINTR); - close(pipes[1]); - exit(ret); - default: - close(pipes[1]); - if (sigsetjmp(jenv, 1)) { - (void)alarm(0); - (void)signal(SIGALRM, SIG_DFL); - if (waitpid(0, (int *)0, WNOHANG) == 0) - kill(pid, SIGKILL); - errno = ETIMEDOUT; - seconds = 1; - goto err; - } - (void)signal(SIGALRM, sigalarm); - (void)alarm(seconds); - if (read(pipes[0], buf, sizeof(struct stat)) == 0) { - errno = EFAULT; - ret = -1; - } - (void)alarm(0); - (void)signal(SIGALRM, SIG_DFL); - close(pipes[0]); - waitpid(pid, NULL, 0); - break; - } - return ret; - err: - return -1; -} -#endif /* WITH_TIMEOUT_STAT */ - -#ifdef _LISTS_H +#if defined(WITH_MOUNTINFO_LIST) /* * Use /proc/self/mountinfo of modern linux system to determine * the device numbers of the mount points. Use this to avoid the @@ -1990,42 +1898,46 @@ static void init_mntinfo(void) /* * Determine device of links below /proc/ */ -static dev_t device(const char *path) +static int mntstat(const char *path, struct stat *buf) { char name[PATH_MAX + 1]; const char *use; ssize_t nlen; list_t *ptr; - if ((nlen = readlink(path, name, PATH_MAX)) < 0) { - nlen = strlen(path); - use = &path[0]; - } else { - name[nlen] = '\0'; - use = &name[0]; - } - - if (*use != '/') { /* special file (socket, pipe, inotify) */ - struct stat st; - if (timeout(stat, path, &st, 5) != 0) - return (dev_t) - 1; - return st.st_dev; + if ((use = realpath(path, name)) == NULL || *use != '/') + { + if (errno == ENOENT) + return -1; + /* + * Could be a special file (socket, pipe, inotify) + */ + errno = 0; + return stat(path, buf); } + nlen = strlen(use); list_for_each(ptr, &mntinfo) { mntinfo_t *mnt = list_entry(ptr, mntinfo_t); if (nlen < mnt->nlen) continue; - if (mnt->nlen == 1) /* root fs is the last entry */ - return mnt->dev; + if (mnt->nlen == 1) { /* root fs is the last entry */ + buf->st_dev = mnt->dev; + buf->st_ino = 0; + return 0; + } if (use[mnt->nlen] != '\0' && use[mnt->nlen] != '/') continue; - if (strncmp(use, mnt->mpoint, mnt->nlen) == 0) - return mnt->dev; + if (strncmp(use, mnt->mpoint, mnt->nlen) == 0) { + buf->st_dev = mnt->dev; + buf->st_ino = 0; + return 0; + } } - return (dev_t) - 1; + errno = ENOENT; + return -1; } -#endif /* _LISTS_H */ +#endif /* WITH_MOUNTINFO_LIST */ /* * Somehow the realpath(3) glibc function call, nevertheless --- src/fuser.h +++ src/fuser.h 2014-03-24 00:00:00.000000000 +0000 @@ -86,7 +86,7 @@ struct mount_list { struct mount_list *next; }; -#if defined (__GNUC__) && defined(__OPTIMIZE__) && !defined (__CYGWIN__) +#if defined (__GNUC__) && defined(WITH_MOUNTINFO_LIST) # include "lists.h" typedef struct mntinfo_s { list_t this; @@ -95,6 +95,8 @@ typedef struct mntinfo_s { size_t nlen; char *mpoint; } mntinfo_t; +#else +# undef WITH_MOUNTINFO_LIST #endif #define NAMESPACE_FILE 0 --- src/lists.h +++ src/lists.h 2014-03-24 00:00:00.000000000 +0000 @@ -1,10 +1,10 @@ /* - * lists.h Simple doubly linked list implementation, - * based on <linux/list.h> and <linux/prefetch.h>. + * lists.h Simple doubly linked list implementation, based on + * <linux/list.h>, <linux/prefetch.h>, and lib/list_sort.c * - * Version: 0.1 01-Feb-2011 Fink + * Version: 0.2 11-Dec-2012 Fink * - * Copyright 2011 Werner Fink, 2005 SUSE LINUX Products GmbH, Germany. + * Copyright 2011,2012 Werner Fink, 2005,2012 SUSE LINUX Products GmbH, Germany. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -246,4 +246,128 @@ static inline void move_tail(list_t *res #define np_list_for_each_prev(pos, head) \ for (pos = (head)->prev; pos != (head); pos = pos->prev) +#define MAX_LIST_LENGTH_BITS 20 + +/* + * Returns a list organized in an intermediate format suited + * to chaining of merge() calls: null-terminated, no reserved or + * sentinel head node, "prev" links not maintained. + */ +static inline list_t *merge(int (*cmp)(list_t *a, list_t *b), list_t *a, list_t *b) +{ + list_t head, *tail = &head; + while (a && b) { + /* if equal, take 'a' -- important for sort stability */ + if ((*cmp)(a, b) <= 0) { + tail->next = a; + a = a->next; + } else { + tail->next = b; + b = b->next; + } + tail = tail->next; + } + tail->next = a ? a : b; + return head.next; +} + +/* + * Combine final list merge with restoration of standard doubly-linked + * list structure. This approach duplicates code from merge(), but + * runs faster than the tidier alternatives of either a separate final + * prev-link restoration pass, or maintaining the prev links + * throughout. + */ +static inline void merge_and_restore_back_links(int (*cmp)(list_t *a, list_t *b), list_t *head, list_t *a, list_t *b) +{ + list_t *tail = head; + + while (a && b) { + /* if equal, take 'a' -- important for sort stability */ + if ((*cmp)(a, b) <= 0) { + tail->next = a; + a->prev = tail; + a = a->next; + } else { + tail->next = b; + b->prev = tail; + b = b->next; + } + tail = tail->next; + } + tail->next = a ? a : b; + + do { + /* + * In worst cases this loop may run many iterations. + * Continue callbacks to the client even though no + * element comparison is needed, so the client's cmp() + * routine can invoke cond_resched() periodically. + */ + (*cmp)(tail->next, tail->next); + + tail->next->prev = tail; + tail = tail->next; + } while (tail->next); + + tail->next = head; + head->prev = tail; +} + + +/** + * list_sort - sort a list + * @head: the list to sort + * @cmp: the elements comparison function + * + * This function implements "merge sort", which has O(nlog(n)) + * complexity. + * + * The comparison function @cmp must return a negative value if @a + * should sort before @b, and a positive value if @a should sort after + * @b. If @a and @b are equivalent, and their original relative + * ordering is to be preserved, @cmp must return 0. + */ +static inline void list_sort(list_t *head, int (*cmp)(list_t *a, list_t *b)) +{ + list_t *part[MAX_LIST_LENGTH_BITS+1]; /* sorted partial lists + -- last slot is a sentinel */ + size_t lev; /* index into part[] */ + size_t max_lev = 0; + list_t *list; + + if (list_empty(head)) + return; + + memset(part, 0, sizeof(part)); + + head->prev->next = NULL; + list = head->next; + + while (list) { + list_t *cur = list; + list = list->next; + cur->next = NULL; + + for (lev = 0; part[lev]; lev++) { + cur = merge(cmp, part[lev], cur); + part[lev] = NULL; + } + if (lev > max_lev) { + /* list passed to list_sort() too long for efficiency */ + if (lev >= MAX_LIST_LENGTH_BITS) + lev--; + max_lev = lev; + } + part[lev] = cur; + } + + for (lev = 0; lev < max_lev; lev++) { + if (part[lev]) + list = merge(cmp, part[lev], list); + } + + merge_and_restore_back_links(cmp, head, part[max_lev], list); +} + #endif /* _LISTS_H */ --- src/timeout.c +++ src/timeout.c 2014-03-24 00:00:00.000000000 +0000 @@ -2,9 +2,9 @@ * timout.c Advanced timeout handling for file system calls * to avoid deadlocks on remote file shares. * - * Version: 0.1 07-Sep-2011 Fink + * Version: 0.2 11-Dec-2012 Fink * - * Copyright 2011 Werner Fink, 2011 SUSE LINUX Products GmbH, Germany. + * Copyright 2011,2012 Werner Fink, 2011,2012 SUSE LINUX Products GmbH, Germany. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -18,26 +18,29 @@ # define _GNU_SOURCE #endif -#ifndef USE_SOCKETPAIR -# define USE_SOCKETPAIR 1 -#endif - #ifdef _FEATURES_H # error Include local config.h before any system header file #endif -#include "config.h" /* For _FILE_OFFSET_BITS */ +#include "config.h" + +#ifndef WITH_TIMEOUT_STAT +# define WITH_TIMEOUT_STAT 0 +#endif + +#ifndef USE_SOCKETPAIR +# define USE_SOCKETPAIR 1 +#endif #include <errno.h> -#include <pthread.h> #include <setjmp.h> #include <signal.h> #include <stdlib.h> #include <string.h> +#include <sys/mman.h> #include <sys/time.h> #include <sys/types.h> #include <sys/select.h> #include <sys/stat.h> - #include <unistd.h> #if USE_SOCKETPAIR # include <sys/socket.h> @@ -86,6 +89,15 @@ # define strcpy(d,s) __builtin_strcpy((d),(s)) /* Without boundary check please */ #endif +#if WITH_TIMEOUT_STAT +static sigjmp_buf jenv; +static void sigjump(int sig attribute((unused))) +{ + siglongjmp(jenv, 1); +} +#endif + +#if WITH_TIMEOUT_STAT == 2 /* * The structure used for communication between the processes */ @@ -106,7 +118,8 @@ typedef struct _handle { static volatile pid_t active; static int pipes[4] = {-1, -1, -1, -1}; -static char buf[PATH_MAX + sizeof(handle_t) + 1]; +static handle_t *restrict handle; +static const size_t buflen = PATH_MAX+sizeof(handle_t)+1; static void sigchild(int sig attribute((unused))) { @@ -122,6 +135,7 @@ static void attribute((constructor)) sta { sigset_t sigset, oldset; struct sigaction act; + char sync[1]; ssize_t in; if (pipes[1] >= 0) close(pipes[1]); @@ -138,6 +152,12 @@ static void attribute((constructor)) sta act.sa_handler = sigchild; sigaction(SIGCHLD, &act, 0); + if (!handle) + handle = mmap(NULL, buflen, PROT_READ|PROT_WRITE, + MAP_ANONYMOUS|MAP_SHARED, -1, 0); + if (handle == MAP_FAILED) + goto error; + if ((active = fork()) < 0) goto error; @@ -164,16 +184,22 @@ static void attribute((constructor)) sta pipes[1] = pipes[2] = -1; pipes[0] = pipes[3] = -1; - { - handle_t *restrict handle = (void*)&buf[0]; - - while ((in = read(STDIN_FILENO, handle, sizeof(buf))) > sizeof(handle_t)) { - if (handle->function(handle->path, &handle->argument) < 0) - handle->errcode = errno; - write(STDOUT_FILENO, &handle->errcode, sizeof(handle->errcode)+sizeof(handle->argument)); - memset(handle, 0, sizeof(handle_t)); + while ((in = read(STDIN_FILENO, &sync, sizeof(sync))) != 0) { + ssize_t out; + if (in < 0) { + if (errno == EINTR) + continue; + break; } + if (!handle) + break; + if (handle->function(handle->path, &handle->argument) < 0) + handle->errcode = errno; + do + out = write(STDOUT_FILENO, &sync, sizeof(sync)); + while (out < 0 && errno == EINTR); } + sigprocmask(SIG_SETMASK, &oldset, NULL); exit(0); error: @@ -181,6 +207,9 @@ error: if (pipes[1] >= 0) close(pipes[1]); if (pipes[2] >= 0) close(pipes[2]); if (pipes[3] >= 0) close(pipes[3]); + if (handle && handle != MAP_FAILED) + munmap(handle, buflen); + handle = NULL; } static void /* attribute((destructor)) */ stop(void) @@ -189,24 +218,24 @@ static void /* attribute((destructor)) * kill(active, SIGKILL); } -static sigjmp_buf jenv; -static void sigjump(int sig attribute((unused))) -{ - siglongjmp(jenv, 1); -} - /* * External routine + * + * Execute stat(2) system call with timeout to avoid deadlock + * on network based file systems. + * */ -int timeout(stat_t function, const char *path, struct stat *restrict argument, time_t seconds) +int +timeout(stat_t function, const char *path, struct stat *restrict argument, time_t seconds) { - handle_t *restrict handle = (void*)&buf[0]; struct sigaction alrm_act, pipe_act, new_act; sigset_t sigset, oldset; + char sync[1] = "x"; if (active <= 0) /* Oops, last one failed therefore clear status and restart */ start(); - + if (!handle) /* No shared memory area */ + return function(path, argument); memset(handle, 0, sizeof(handle_t)); handle->len = strlen(path) + 1; if (handle->len >= PATH_MAX) { @@ -235,8 +264,8 @@ int timeout(stat_t function, const char sigaction(SIGPIPE, &new_act, &pipe_act); alarm(seconds); - write(pipes[1], handle, sizeof(handle_t)+handle->len); - read(pipes[2], &handle->errcode, sizeof(handle->errcode)+sizeof(handle->argument)); + write(pipes[1], &sync, sizeof(sync)); + read(pipes[2], &sync, sizeof(sync)); alarm(0); sigaction(SIGPIPE, &pipe_act, NULL); @@ -261,6 +290,82 @@ timed: error: return -1; } +#elif WITH_TIMEOUT_STAT == 1 +/* + * External routine + * + * Execute stat(2) system call with timeout to avoid deadlock + * on network based file systems. + * + */ +int +timeout(stat_t function, const char *path, struct stat *restrict argument, time_t seconds) +{ + struct sigaction alrm_act, pipe_act, new_act; + sigset_t sigset, oldset; + int ret = 0, pipes[4]; + pid_t pid = 0; + ssize_t len; + + if (pipe(&pipes[0]) < 0) + goto error; + switch ((pid = fork())) { + case -1: + close(pipes[0]); + close(pipes[1]); + goto error; + case 0: + new_act.sa_handler = SIG_DFL; + sigaction(SIGALRM, &new_act, NULL); + close(pipes[0]); + if ((ret = function(path, argument)) == 0) + do + len = write(pipes[1], argument, sizeof(struct stat)); + while (len < 0 && errno == EINTR); + close(pipes[1]); + exit(ret); + default: + close(pipes[1]); + + sigemptyset(&sigset); + sigaddset(&sigset, SIGALRM); + sigaddset(&sigset, SIGPIPE); + sigprocmask(SIG_UNBLOCK, &sigset, &oldset); + + memset(&new_act, 0, sizeof(new_act)); + sigemptyset(&new_act.sa_mask); + + if (sigsetjmp(jenv, 1)) + goto timed; + + new_act.sa_handler = sigjump; + sigaction(SIGALRM, &new_act, &alrm_act); + sigaction(SIGPIPE, &new_act, &pipe_act); + alarm(seconds); + if (read(pipes[0], argument, sizeof(struct stat)) == 0) { + errno = EFAULT; + ret = -1; + } + (void)alarm(0); + sigaction(SIGPIPE, &pipe_act, NULL); + sigaction(SIGALRM, &alrm_act, NULL); + + close(pipes[0]); + waitpid(pid, NULL, 0); + break; + } + return ret; +timed: + (void)alarm(0); + sigaction(SIGPIPE, &pipe_act, NULL); + sigaction(SIGALRM, &alrm_act, NULL); + if (waitpid(0, NULL, WNOHANG) == 0) + kill(pid, SIGKILL); + errno = ETIMEDOUT; +error: + return -1; +} +#endif /* * End of timeout.c --- src/timeout.h +++ src/timeout.h 2014-03-24 00:00:00.000000000 +0000 @@ -17,7 +17,11 @@ #ifndef _TIMEOUT_H #define _TIMEOUT_H -#include "config.h" /* For _FILE_OFFSET_BITS */ +#include "config.h" + +#ifndef WITH_TIMEOUT_STAT +# define WITH_TIMEOUT_STAT 0 +#endif #include <sys/types.h> #include <sys/stat.h> @@ -30,7 +34,12 @@ # endif #endif -typedef int (*stat_t)(const char *, struct stat *restrict); +typedef int (*stat_t)(const char *, struct stat *); + +#if WITH_TIMEOUT_STAT > 0 extern int timeout(stat_t, const char *, struct stat *restrict, time_t); +#else +# define timeout(func,path,buf,dummy) (func)((path),(buf)) +#endif #endif
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