diff options
Diffstat (limited to 'src/common/compat.c')
| -rw-r--r-- | src/common/compat.c | 109 |
1 files changed, 105 insertions, 4 deletions
diff --git a/src/common/compat.c b/src/common/compat.c index fc066da68..1d00e30c4 100644 --- a/src/common/compat.c +++ b/src/common/compat.c @@ -103,6 +103,35 @@ #include "strlcat.c" #endif +/** As open(path, flags, mode), but return an fd with the close-on-exec mode + * set. */ +int +tor_open_cloexec(const char *path, int flags, unsigned mode) +{ +#ifdef O_CLOEXEC + return open(path, flags|O_CLOEXEC, mode); +#else + int fd = open(path, flags, mode); +#ifdef FD_CLOEXEC + if (fd >= 0) + fcntl(fd, F_SETFD, FD_CLOEXEC); +#endif + return fd; +#endif +} + +/** DOCDOC */ +FILE * +tor_fopen_cloexec(const char *path, const char *mode) +{ + FILE *result = fopen(path, mode); +#ifdef FD_CLOEXEC + if (result != NULL) + fcntl(fileno(result), F_SETFD, FD_CLOEXEC); +#endif + return result; +} + #ifdef HAVE_SYS_MMAN_H /** Try to create a memory mapping for <b>filename</b> and return it. On * failure, return NULL. Sets errno properly, using ERANGE to mean @@ -118,7 +147,7 @@ tor_mmap_file(const char *filename) tor_assert(filename); - fd = open(filename, O_RDONLY, 0); + fd = tor_open_cloexec(filename, O_RDONLY, 0); if (fd<0) { int save_errno = errno; int severity = (errno == ENOENT) ? LOG_INFO : LOG_WARN; @@ -695,7 +724,7 @@ tor_lockfile_lock(const char *filename, int blocking, int *locked_out) *locked_out = 0; log_info(LD_FS, "Locking \"%s\"", filename); - fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0600); + fd = tor_open_cloexec(filename, O_RDWR|O_CREAT|O_TRUNC, 0600); if (fd < 0) { log_warn(LD_FS,"Couldn't open \"%s\" for locking: %s", filename, strerror(errno)); @@ -920,8 +949,16 @@ mark_socket_open(int s) int tor_open_socket(int domain, int type, int protocol) { - int s = socket(domain, type, protocol); + int s; +#ifdef SOCK_CLOEXEC +#define LINUX_CLOEXEC_OPEN_SOCKET + type |= SOCK_CLOEXEC; +#endif + s = socket(domain, type, protocol); if (s >= 0) { +#if !defined(LINUX_CLOEXEC_OPEN_SOCKET) && defined(FD_CLOEXEC) + fcntl(s, F_SETFD, FD_CLOEXEC); +#endif socket_accounting_lock(); ++n_sockets_open; mark_socket_open(s); @@ -934,8 +971,17 @@ tor_open_socket(int domain, int type, int protocol) int tor_accept_socket(int sockfd, struct sockaddr *addr, socklen_t *len) { - int s = accept(sockfd, addr, len); + int s; +#if defined(HAVE_ACCEPT4) && defined(SOCK_CLOEXEC) +#define LINUX_CLOEXEC_ACCEPT + s = accept4(sockfd, addr, len, SOCK_CLOEXEC); +#else + s = accept(sockfd, addr, len); +#endif if (s >= 0) { +#if !defined(LINUX_CLOEXEC_ACCEPT) && defined(FD_CLOEXEC) + fcntl(s, F_SETFD, FD_CLOEXEC); +#endif socket_accounting_lock(); ++n_sockets_open; mark_socket_open(s); @@ -991,8 +1037,17 @@ tor_socketpair(int family, int type, int protocol, int fd[2]) //don't use win32 socketpairs (they are always bad) #if defined(HAVE_SOCKETPAIR) && !defined(MS_WINDOWS) int r; +#ifdef SOCK_CLOEXEC + type |= SOCK_CLOEXEC; +#endif r = socketpair(family, type, protocol, fd); if (r == 0) { +#if !defined(SOCK_CLOEXEC) && defined(FD_CLOEXEC) + if (fd[0] >= 0) + fcntl(fd[0], F_SETFD, FD_CLOEXEC); + if (fd[1] >= 0) + fcntl(fd[1], F_SETFD, FD_CLOEXEC); +#endif socket_accounting_lock(); if (fd[0] >= 0) { ++n_sockets_open; @@ -1980,6 +2035,52 @@ spawn_exit(void) #endif } +/** Implementation logic for compute_num_cpus(). */ +static int +compute_num_cpus_impl(void) +{ +#ifdef MS_WINDOWS + SYSTEM_INFO info; + memset(&info, 0, sizeof(info)); + GetSystemInfo(&info); + if (info.dwNumberOfProcessors >= 1 && info.dwNumberOfProcessors < INT_MAX) + return (int)info.dwNumberOfProcessors; + else + return -1; +#elif defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_CONF) + long cpus = sysconf(_SC_NPROCESSORS_CONF); + if (cpus >= 1 && cpus < INT_MAX) + return (int)cpus; + else + return -1; +#else + return -1; +#endif +} + +#define MAX_DETECTABLE_CPUS 16 + +/** Return how many CPUs we are running with. We assume that nobody is + * using hot-swappable CPUs, so we don't recompute this after the first + * time. Return -1 if we don't know how to tell the number of CPUs on this + * system. + */ +int +compute_num_cpus(void) +{ + static int num_cpus = -2; + if (num_cpus == -2) { + num_cpus = compute_num_cpus_impl(); + tor_assert(num_cpus != -2); + if (num_cpus > MAX_DETECTABLE_CPUS) + log_notice(LD_GENERAL, "Wow! I detected that you have %d CPUs. I " + "will not autodetect any more than %d, though. If you " + "want to configure more, set NumCPUs in your torrc", + num_cpus, MAX_DETECTABLE_CPUS); + } + return num_cpus; +} + /** Set *timeval to the current time of day. On error, log and terminate. * (Same as gettimeofday(timeval,NULL), but never returns -1.) */ |