diff options
Diffstat (limited to 'man2/memfd_create.2')
| -rw-r--r-- | man2/memfd_create.2 | 46 |
1 files changed, 23 insertions, 23 deletions
diff --git a/man2/memfd_create.2 b/man2/memfd_create.2 index 3274b3983..873163719 100644 --- a/man2/memfd_create.2 +++ b/man2/memfd_create.2 @@ -414,7 +414,7 @@ Existing seals: WRITE SHRINK #include <string.h> #include <sys/mman.h> #include <unistd.h> - +\& int main(int argc, char *argv[]) { @@ -422,7 +422,7 @@ main(int argc, char *argv[]) char *name, *seals_arg; ssize_t len; unsigned int seals; - +\& if (argc < 3) { fprintf(stderr, "%s name size [seals]\en", argv[0]); fprintf(stderr, "\et\[aq]seals\[aq] can contain any of the " @@ -434,35 +434,35 @@ main(int argc, char *argv[]) fprintf(stderr, "\et\etS \- F_SEAL_SEAL\en"); exit(EXIT_FAILURE); } - +\& name = argv[1]; len = atoi(argv[2]); seals_arg = argv[3]; - +\& /* Create an anonymous file in tmpfs; allow seals to be placed on the file. */ - +\& fd = memfd_create(name, MFD_ALLOW_SEALING); if (fd == \-1) err(EXIT_FAILURE, "memfd_create"); - +\& /* Size the file as specified on the command line. */ - +\& if (ftruncate(fd, len) == \-1) err(EXIT_FAILURE, "truncate"); - +\& printf("PID: %jd; fd: %d; /proc/%jd/fd/%d\en", (intmax_t) getpid(), fd, (intmax_t) getpid(), fd); - +\& /* Code to map the file and populate the mapping with data omitted. */ - +\& /* If a \[aq]seals\[aq] command\-line argument was supplied, set some seals on the file. */ - +\& if (seals_arg != NULL) { seals = 0; - +\& if (strchr(seals_arg, \[aq]g\[aq]) != NULL) seals |= F_SEAL_GROW; if (strchr(seals_arg, \[aq]s\[aq]) != NULL) @@ -473,16 +473,16 @@ main(int argc, char *argv[]) seals |= F_SEAL_FUTURE_WRITE; if (strchr(seals_arg, \[aq]S\[aq]) != NULL) seals |= F_SEAL_SEAL; - +\& if (fcntl(fd, F_ADD_SEALS, seals) == \-1) err(EXIT_FAILURE, "fcntl"); } - +\& /* Keep running, so that the file created by memfd_create() continues to exist. */ - +\& pause(); - +\& exit(EXIT_SUCCESS); } .EE @@ -496,26 +496,26 @@ main(int argc, char *argv[]) #include <fcntl.h> #include <stdio.h> #include <stdlib.h> - +\& int main(int argc, char *argv[]) { int fd; unsigned int seals; - +\& if (argc != 2) { fprintf(stderr, "%s /proc/PID/fd/FD\en", argv[0]); exit(EXIT_FAILURE); } - +\& fd = open(argv[1], O_RDWR); if (fd == \-1) err(EXIT_FAILURE, "open"); - +\& seals = fcntl(fd, F_GET_SEALS); if (seals == \-1) err(EXIT_FAILURE, "fcntl"); - +\& printf("Existing seals:"); if (seals & F_SEAL_SEAL) printf(" SEAL"); @@ -528,10 +528,10 @@ main(int argc, char *argv[]) if (seals & F_SEAL_SHRINK) printf(" SHRINK"); printf("\en"); - +\& /* Code to map the file and access the contents of the resulting mapping omitted. */ - +\& exit(EXIT_SUCCESS); } .EE |